www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
　
FEATURES
Advanced Bus Converter industry standard
quarter-brick with digital PMBus interface
Optional standard fi ve pin quarter-brick
High effi ciency, 95.2% (typ)
Superior thermal performance
Fast dynamic response
± 2% Vout setting accuracy
2250Vdc input to output isolation voltage
(functional)
Optional baseplate (B option)
PMBus™ Revision 1.2 compliant
Voltage droop load sharing for parallel operation
Certifi ed to UL/EN/IEC 60950-1, CAN/CSA-C22.2
No. 60950-1, 2nd Edition, safety approvals and
EN55022/CISPR22 standards
Power Management (PMBus Options)
Confi gurable soft-start/stop
Confi gurable output voltage (Vout) and voltage
margins (Margin low and Margin high)
Confi gurable protection limits for OVP, input over
voltage, input under voltage, over current, on/off,
and temperature.
Module Status monitor Vout, Iout, Vin, Temp,
Power good, and On/Off.
System status monitor (Vout, Iout, Vin and Temp
over time)
Applications
Distributed power architectures
Intermediate bus voltage applications
Servers and storage applications
Network equipment
PRODUCT OVERVIEW
Murata Power Solutions is introducing the fi rst in
a series of digitally controlled DC-DC converters
that are based on a 32-bit ARM processor. The DBQ
series provides a fully regulated, digitally controlled
DC output in a ¼-brick format that will support the
evolving Advanced Bus Converter (ABC) industry
standard footprint for isolated board mounted
power modules. The DBQ series supports advances
in power conversion technology including a digital
interface supporting the PMBus protocol for com-
munications to power modules.
The DBQ series also incorporates a “droop” load
sharing option that allows connecting two or more
units together in parallel for demanding power-
hungry applications or to provide redundancy in
high reliability applications. The converter also
offers high input to output isolation of 2250 VDC as
required for Power over Ethernet (PoE) applications.
The DBQ series is suitable for applications cov-
ering MicroTCA, servers and storage applications,
networking equipment, telecommunications equip-
ment, Power over Ethernet (PoE), fan trays, wireless
networks, wireless pre-amplifi ers, and industrial
and test equipment, along with other applications
requiring a regulated 12V.
Typical units
Output (V) Current (A) Input (Vdc)
3.3 60
36-75560
12 35
FEATURES
PRODUCT O
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DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 1 of 31
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PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Root Model
Output Input
Efficiency Dimensions (open frame, max.)
VOUT
(V)
IOUT
(A, max)
Total
Power
(W)
Ripple & Noise
(mVp-p) Regulation (max.) VIN Nom.
(V)
Range
(V)
IIN, min.
load
(mA)
IIN, full
load
(A)
Typ. Max. Line (mV) Load (mV) Min. Typ. (inches) (mm)
DBQ0360V2 3.3 60 198 40 150 20 15 48 36-75 50 4.43 92.0% 93.2% 2.3x1.45x0.48 max. 58.4x36.83x12.19
DBQ0260V2 5 60 300 50 150 30 25 48 36-75 50 6.59 93.0% 94.8% 2.3x1.45x0.48 max. 58.4x36.83x12.19
DBQ0135V2 12 35 420 100 150 75 45 48 36-75 75 9.19 94% 95.2% 2.3x1.45x0.48 max. 58.4x36.83x12.19
DVQ0360V2 ➁3.3 60 198 40 150 20 15 48 36-75 50 4.43 92.0% 93.2% 2.3x1.45x0.48 max. 58.4x36.83x12.19
DVQ0260V2 ➁5 60 300 50 150 30 25 48 36-75 50 6.59 93.0% 94.8% 2.3x1.45x0.48 max. 58.4x36.83x12.19
DVQ0135V2 ➁12 35 420 100 150 75 45 48 36-75 75 9.19 94% 95.2% 2.3x1.45x0.48 max. 58.4x36.83x12.19
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are speci-
fi ed with external 1F and 10F capacitors in parallel across their output pins.
➁ DVQ models do not have the PMBus feature.
DIGITAL CONTROL BRICK PART NUMBER FORMAT
Part Number Example
DBQ0135V2NBSC = Full Featured Digital 1/4 Brick, 12Vout, 35A, 36-75Vin, Negative logic, Baseplate, Load Sharing, RoHS 6/6 compliant
➀ PMBus Confi gurable
➁ Minimum order quantity is required. Samples available with standard pin length only.
Note: Some model number combinations may not be available. See website or contact your local Murata sales representative.
Contact your local Murata sales representative for ordering details.
Description Part Number Structure Definition and Options
Product Family D X DB = Full Featured Digital Bus converter, DV = NO PMBus, NO Sense & Trim Pins
Form Factor Q Q = Quarter Brick
Vout ➀01 01 = 12Vout, 02 = 5Vout, 03 = 3.3Vout (Without PMBus Vout cannot be changed)
Output Current 3 5 Max Iout in Amps
Vin Range V 2 V2 = 36-75V
Logic ➀NN = Negative, P = Positive
Pin Length ➁X1 = 0.110" (cut), 2 = 0.145"(cut), Omit for standard shown in the mechanical drawings
Mechanical Confi guration B B = Baseplate, Omit for Open Frame (Standard Confi guration)
Load Sharing S S = Load Sharing, Omit for Standard (Standard Confi guration)
Specifi c Customer Confi guration X X Customer Code, Omit for Standard
RoHS C RoHS 6/6 Compliant
EVALUATION BOARD AVAILABLE FROM MURATA POWER SOLUTIONS
Part Number Application Note USB Adaptor Part Number GUI Software Application Note
MPS-TD001 www.murata-ps.com/data/apnotes/dcan-63.pdf MPS-AD001 www.murata-ps.com/data/apnotes/dcan-63.pdf
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 2 of 31
www.murata-ps.com/support
PRELIMINARY
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 080Vdc
Input Voltage, Transient 100 mS max. duration 100 Vdc
Isolation Voltage Input to output 2250 Vdc
On/Off Remote Control Power on, referred to -Vin 0 13.5 Vdc
Output Power 0 200 W
Output Current Current-limited, no damage, short-circuit protected 0 60 A
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied nor recommended.
INPUT
Operating voltage range (V2) 364875Vdc
Start-up threshold (Default, confi gurable via PMBus) 33 34 35 Vdc
Undervoltage shutdown (Default, confi gurable via PMBus) 31 32 34 Vdc
Overvoltage shutdown (Default, confi gurable via PMBus) NA NA NA Vdc
Overvoltage Recover (Default, confi gurable via PMBus) NA NA NA Vdc
Internal Filter Type Pi
External Input fuse 20A
Input current
Full Load Conditions Vin = nominal 4.43 4.48 A
Low Line input current Vin = minimum 5.79 5.97 A
Inrush Transient Vin = 48V. TBD TBD A2-Sec.
Short Circuit input current 0.05 0.1 A
No Load input current Iout = minimum, unit=ON 50 100 mA
Shut-Down input currrent(Off, UV, OT) TBD TBD mA
Back Ripple Current TBD TBD mAp-p
GENERAL and SAFETY
Effi ciency Vin=48V, full load (V2) 92 93.2 %
Isolation Voltage
Input to output 2250 Vdc
Input to Baseplate 1500 Vdc
Output to Baseplate 1500 Vdc
Insulation Safety Rating functional
Isolation Resistance 10 M
Isolation Capacitance 1000 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1, IEC/
EN60950-1, 2nd edition Yes
Calculated MTBF Per Telcordia SR-332, Issue 2, Method 1, Class 1, Ground Fixed,
Tcase=+25°C 1800 Hours x 103
DYNAMIC CHARACTERISTICS
Switching Frequency (Confi gurable via PMBus)
Fixed Frequency Control 
150 KHz
Variable Frequency Control (Default) 
NA KHz
Turn On Time (Default, Confi gurable via PMBus)
Vin On to Vout Regulated 
45 mS
Remote On to Vout Regulated 
25 mS
Vout Rise Time (Default, Confi gurable via PMBus)
From 0%~100% 
20 mS
Vout Fall Time of Regulated Off (Default, Confi gurable via PMBus)
From 100%~0% 
13 mS
Dynamic Load Response 50-75-50%, 1A/us,within 1% of Vout TBD TBD µSec
Dynamic Load Peak Deviation same as above TBD TBD mV
DBQ0360V2: 3.3V/60A FUNCTIONAL SPECIFICATIONS (VOLTAGE APPLIED TO SCL SDA SMBALERT AND ON/OFF 2, MIN: -0.3V MAX: 3.6V)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 3 of 31
www.murata-ps.com/support
PRELIMINARY
FEATURES and OPTIONS Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control
Primary On/Off control (designed to be driving with an open collector logic, Voltages referenced to -Vin)
“P” suffi x:
Positive Logic, ON state ON = pin open or external voltage 3.5 13.5 V
Positive Logic, OFF state OFF = ground pin or external voltage 0 0.8 V
Control Current open collector/drain 0.1 0.2 mA
“N” suffi x:
Negative Logic, ON state ON = ground pin or external voltage -0.1 0.8 V
Negative Logic, OFF state OFF = pin open or external voltage 3.5 13.5 V
Control Current open collector/drain 0.1 0.2 mA
OUTPUT
Total Output Power 0 198 200 W
Voltage
Setting Accuracy At 100% load, no trim, all conditions 3.27 3.3 3.33 Vdc
Output Adjust Range Confi gurable via PMBus 2.2 3.6 Vdc
Overvoltage Protection Confi gurable via PMBus 4Vdc
Voltage Droop Default, confi gurable via PMBus 0m
Current
Output Current Range 06060A
Minimum Load 
No minimum load 
Current Limit Inception ➁98% of Vnom., after warmup, Confi gurable via PMBus 70A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within 1% of Vout 0.4 1 A
Short Circuit Duration
(remove short for recovery) Output shorted to ground, no damage Continuous 
Short circuit protection method, default
response, confi gurable via PMBus Hiccup current limiting Non-latching 
Regulation ➂
Line Regulation (V2) Vin = 36-75, Vout = nom., full load  20 mV
Load Regulation (V2) Iout = min. to max., Vin = nom.  15 mV
Ripple and Noise 5 Hz- 20 MHz BW, Cout = 1µF 40 150 mV pk-pk
paralleled with 10µF
Temperature Coeffi cient At all outputs 0.01 0.02 % of Vnom./°C
Maximum Output Capacitance Low ESR  10,000 F
Power Good—Negative logic (Confi gurable via PMBus)
Power good high stage voltage 2.4 3.6 Vdc
Power good low stage voltage 00.4 Vdc
Out voltage for power good off triggering Confi gurable via PMBus 2 2.3 2.5 Vdc
Out Voltage for power good on triggering Confi gurable via PMBus 2.6 2.8 3 Vdc
DBQ0360V2 FUNCTIONAL SPECIFICATIONS (CONT.)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 4 of 31
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PRELIMINARY
DBQ0360V2 FUNCTIONAL SPECIFICATIONS (CONT.)
PMBus Conditions ➀Minimum Typical/Nominal Maximum Units
PMBus GENERAL
PMBus REV. 1.2. SMBALERT# is supported. PEC is supported. Linear data format used.
Bus speed 
400 kHz
Logic high input 23.3 Vdc
Logic low input 00.8 Vdc
Logic high output 2.4 
Vdc
Logic low output 
0.4 Vdc
PMBus ADDRESSING
If the calculated PMBus address is 0d, 11d or 12d, SA0 or SA1 lefts open, default PMBus address 119d is assigned instead. PMBus address = 8x(SA0 value) + (SA1 value). SA0, SA1 value VS
resistor connected to GND.
0
10 k
1
22 k
2
33 k
3
47 k
4
68 k
5
100 k
6
150 k
7
220 k
PMBus MONITORING ACCURACY
VIN_READ -2 2%
VOUT_READ -1 1%
IOUT_READ (> = 10A) -5 5%
IOUT_READ (<10A) -1 1A
TEMP_READ 55°C
DIGITAL INTERFACE SPECIFICATIONS (PMBUS MONITORING & FUNCTIONAL DESCRIPTION)
Fault Protection Specifi cations
Output Voltage, Over Voltage protection, OVP Factory default 4V
VOUT_OV_FAULT_LIMIT, Confi gurable via
PMBus >VOUT_OV_WARM_LIMIT 3 4V
Restart delay (default, Confi gurable via PMBus) 500 ms
Input Voltage, Input Over Voltage Protection Factory default NA V
Setpoint accuracy %
VIN_OV_FAULT_LIMIT (Confi gurable via
PMBus) ➃>VIN_OV_WARM_LIMIT NA V
Restart delay (default, Confi gurable via PMBus) ms
Input Voltage, Input Under Voltage Protection,
UVLO Factory default 32 V
Setpoint accuracy -2 2%
VIN_UV_FAULT_LIMIT (Confi gurable via
PMBus) ➃<VIN_UV_WARM_LIMIT <VIN_OV_FAULT_LIMIT 32 75 V
Restart delay (default, Confi gurable via PMBus) 100 ms
Over Current Protection, OCP Setpoint accuracy (Io) -2.5 2.5 %
(factory default) 70 A
IOUT_OC_FAULT_LIMIT (Confi gurable via
PMBus) ➃>IOUT_OC_WARN_LIMT 0 75 A
Restart delay (default, Confi gurable via PMBus) 100 ms
Over Temperature Protection, OTP OT_FAULT_LIMIT (factory default) 120 °C
OT_FAULT_LIMIT (Confi gurable via PMBus) ➃>OT_WARM_LIMIT 0 30 150 °C
OTP accuracy (factory default) 5 5°C
Restart delay (default, Confi gurable via PMBus) 500 ms
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 5 of 31
www.murata-ps.com/support
PRELIMINARY
DBQ0360V2 FUNCTIONAL SPECIFICATIONS (CONT.)
MECHANICAL Conditions ➀Minimum Typical/Nominal Maximum Units
Outline Dimensions (open frame) 
2.3 x 1.45 x 0.48 Inches
(Please refer to outline drawing) L x W x H 58.4 x 36.83 x 12.19 mm
Outline Dimensions (with baseplate) 
2.3 x 1.45 x 0.50 Inches

58.4 x 36.80 x 12.7 mm
Weight (open frame) 
TBD Ounces

Grams
Weight (with baseplate) 
TBD Ounces

Grams
Through Hole Pin Diameter 
0.04 & 0.062 Inches

1.016 & 1.575 mm
Digital Interface Pin Diameter 
0.02 

0.5 
Through Hole Pin Material 
Copper alloy 
TH Pin Plating Metal and Thickness Nickel subplate 98.4-299 µ-inches
Gold overplate 4.7-19.6 µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range with derating -40 85 °C
Operating Baseplate Temperature -40 110 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown (with “B” Suffi x,
default value, Confi gurable via PMBUS) Confi gurable Via PMBus 120 °C
Electromagnetic Interference External fi lter required; see BClass
Conducted, EN55022/CISPR22 emissions performance test.
RoHS rating 
RoHS-6 
Notes
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are speci-
fi ed with external 1F and 10F capacitors in parallel across their output pins. All values are
default, unless otherwise noted.
➁ Over-current protection is non-latching with auto recovery (hiccup).
➂ Regulation specifi cations describe the output voltage changes as the line voltage or load current
is varied from its nominal or midpoint value to either extreme.
➃ See Operating information section.
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 6 of 31
www.murata-ps.com/support
PRELIMINARY
PERFORMANCE DATA
Effi ciency vs. Line Voltage and Load Current @ +25°C
70
80
75
85
90
95
100
5 101520253035404550 6055
Load Current (A)
Efficiency (%)
VIN = 36V
VIN = 48V
VIN = 75V
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 7 of 31
Maximum Current Temperature Derating with baseplate
(Vin = 48V, airfl ow from Vin- to Vin+)
Maximum Current Temperature Derating with baseplate
(Vin = 48V, airfl ow from Vin to Vout)
0
10
20
30
40
50
60
70
30 40 50 60 70 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2.5 m/s (500 LFM)
3.0 m/s (600 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
0
10
20
30
40
50
60
70
30 40 50 60 70 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2.5 m/s (500 LFM)
3.0 m/s (600 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
www.murata-ps.com/support
PRELIMINARY
DBQ0260V2: 5V/60A FUNCTIONAL SPECIFICATIONS (VOLTAGE APPLIED TO SCL SDA SMBALERT AND ON/OFF 2, MIN: -0.3V MAX: 3.6V)
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 080 Vdc
Input Voltage, Transient 100 mS max. duration  100 Vdc
Isolation Voltage Input to output  2250 Vdc
On/Off Remote Control Power on, referred to -Vin 0 13.5 Vdc
Output Power 0303 W
Output Current Current-limited, no damage, short-circuit protected 0 60 A
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied nor recommended.
INPUT
Operating voltage range (V2) 36 48 75 Vdc
Start-up threshold (Default, confi gurable via PMBus) 33 34 35 Vdc
Undervoltage shutdown (Default, confi gurable via PMBus) 31 32 34 Vdc
Overvoltage shutdown (Default, confi gurable via PMBus) NA NA NA Vdc
Overvoltage Recover (Default, confi gurable via PMBus) NA NA NA Vdc
Internal Filter Type 
Pi 
External Input fuse 
20 A
Input current
Full Load Conditions Vin = nominal 6.59 6.72 A
Low Line input current Vin = minimum 8.77 8.86 A
Inrush Transient Vin = 48V. TBD TBD A2-Sec.
Short Circuit input current 
0.05 0.1 A
No Load input current Iout = minimum, unit=ON 50 100 mA
Shut-Down input currrent(Off, UV, OT) 
TBD TBD mA
Back Ripple Current 
TBD TBD mAp-p
GENERAL and SAFETY
Effi ciency Vin=48V, full load (V2) 93 94.8 %
Isolation Voltage
Input to output  2250 Vdc
Input to Baseplate  1500 Vdc
Output to Baseplate  1500 Vdc
Insulation Safety Rating 
functional 
Isolation Resistance 
10 M
Isolation Capacitance 
1000 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1, IEC/
EN60950-1, 2nd edition Yes 
Calculated MTBF Per Telcordia SR-332, Issue 2, Method 1, Class 1, Ground Fixed,
Tcase=+25°C 1800 Hours x 103
DYNAMIC CHARACTERISTICS
Switching Frequency (Confi gurable via PMBus)
Fixed Frequency Control 
150 KHz
Variable Frequency Control (Default) 
NA KHz
Turn On Time (Default, Confi gurable via PMBus)
Vin On to Vout Regulated 
45 mS
Remote On to Vout Regulated 
25 mS
Vout Rise Time (Default, Confi gurable via PMBus)
From 0%~100% 
20 mS
Vout Fall Time of Regulated Off (Default, Confi gurable via PMBus)
From 100%~0% 
13 mS
Dynamic Load Response 50-75-50%, 1A/us,within 1% of Vout TBD TBD µSec
Dynamic Load Peak Deviation same as above TBD TBD mV
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 8 of 31
www.murata-ps.com/support
PRELIMINARY
DBQ0260V2 FUNCTIONAL SPECIFICATIONS (CONT.)
FEATURES and OPTIONS Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control
Primary On/Off control (designed to be driving with an open collector logic, Voltages referenced to -Vin)
“P” suffi x:
Positive Logic, ON state ON = pin open or external voltage 3.5 13.5 V
Positive Logic, OFF state OFF = ground pin or external voltage 0 0.8 V
Control Current open collector/drain 0.1 0.2 mA
“N” suffi x:
Negative Logic, ON state ON = ground pin or external voltage -0.1 0.8 V
Negative Logic, OFF state OFF = pin open or external voltage 3.5 13.5 V
Control Current open collector/drain 0.1 0.2 mA
OUTPUT
Total Output Power 0 300 303 W
Voltage
Setting Accuracy At 100% load, no trim, all conditions 4.95 5 5.05 Vdc
Output Adjust Range Confi gurable via PMBus 3 5.5 Vdc
Overvoltage Protection Confi gurable via PMBus 6Vdc
Voltage Droop Default, confi gurable via PMBus 0m
Current
Output Current Range 06060A
Minimum Load 
No minimum load 
Current Limit Inception ➁98% of Vnom., after warmup, Confi gurable via PMBus 70A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within 1% of Vout 0.4 1 A
Short Circuit Duration Output shorted to ground, no damage Continuous 
(remove short for recovery)
Short circuit protection method, default
response, confi gurable via PMBus Hiccup current limiting Non-latching 
Regulation ➂
Line Regulation (V2) Vin = 36-75, Vout = nom., full load  30 mV
Load Regulation (V2) Iout = min. to max., Vin = nom.  25 mV
Ripple and Noise 5 Hz- 20 MHz BW, Cout = 1µF 50 150 mV pk-pk
paralleled with 10µF
Temperature Coeffi cient At all outputs 0.01 0.02 % of Vnom./°C
Maximum Output Capacitance Low ESR  10,000 F
Power Good—Negative logic (Confi gurable via PMBus)
Power good high stage voltage 2.4 3.6 Vdc
Power good low stage voltage 00.4 Vdc
Out voltage for power good off triggering Confi gurable via PMBus 3 3.5 4 Vdc
Out Voltage for power good on triggering Confi gurable via PMBus 3.75 4.25 4.75 Vdc
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 9 of 31
www.murata-ps.com/support
PRELIMINARY
DBQ0260V2 FUNCTIONAL SPECIFICATIONS (CONT.)
PMBus Conditions ➀Minimum Typical/Nominal Maximum Units
PMBus GENERAL
PMBus REV. 1.2. SMBALERT# is supported. PEC is supported. Linear data format used.
Bus speed 400 kHz
Logic high input 2 3.3 Vdc
Logic low input 0 0.8 Vdc
Logic high output 2.4 Vdc
Logic low output 0.4 Vdc
PMBus ADDRESSING
If the calculated PMBus address is 0d, 11d or 12d, SA0 or SA1 lefts open, default PMBus address 119d is assigned instead. PMBus address = 8x(SA0 value) + (SA1 value). SA0, SA1 value VS
resistor connected to GND.
0 10 k
1 22 k
2 33 k
3 47 k
4 68 k
5 100 k
6 150 k
7 220 k
PMBus MONITORING ACCURACY
VIN_READ -22%
VOUT_READ -11%
IOUT_READ (> = 10A) -55%
IOUT_READ (<10A) -11A
TEMP_READ 55°C
DIGITAL INTERFACE SPECIFICATIONS (PMBUS MONITORING & FUNCTIONAL DESCRIPTION)
Fault Protection Specifi cations
Output Voltage, Over Voltage protection, OVP Factory default 6 V
VOUT_OV_FAULT_LIMIT, Confi gurable via
PMBus >VOUT_OV_WARM_LIMIT 3 6 V
Restart delay (default, Confi gurable via PMBus) 500 µS
Input Voltage, Input Over Voltage Protection Factory default NA V
Setpoint accuracy %
VIN_OV_FAULT_LIMIT (Confi gurable via
PMBus) ➃>VIN_OV_WARM_LIMIT NA V
Restart delay (default, Confi gurable via PMBus) µS
Input Voltage, Input Under Voltage Protection,
UVLO Factory default 32 V
Setpoint accuracy -2 2 %
VIN_UV_FAULT_LIMIT (Confi gurable via
PMBus) ➃<VIN_UV_WARM_LIMIT <VIN_OV_FAULT_LIMIT 32 75 V
Restart delay (default, Confi gurable via PMBus) 100 µS
Over Current Protection, OCP Setpoint accuracy (Io) -2.5 2.5 %
(factory default) 70 A
IOUT_OC_FAULT_LIMIT (Confi gurable via
PMBus) ➃>IOUT_OC_WARN_LIMT 0 75 A
Restart delay (default, Confi gurable via PMBus) 100 µS
Over Temperature Protection, OTP OT_FAULT_LIMIT (factory default) 120 °C
OT_FAULT_LIMIT (Confi gurable via PMBus) ➃>OT_WARM_LIMIT 0 30 150 °C
OTP accuracy (factory default) 5 5 °C
Restart delay (default, Confi gurable via PMBus) 500 µS
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 10 of 31
www.murata-ps.com/support
PRELIMINARY
DBQ0260V2 FUNCTIONAL SPECIFICATIONS (CONT.)
Notes
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are speci-
fi ed with external 1F and 10F capacitors in parallel across their output pins. All values are
default, unless otherwise noted.
➁ Over-current protection is non-latching with auto recovery (hiccup).
➂ Regulation specifi cations describe the output voltage changes as the line voltage or load current
is varied from its nominal or midpoint value to either extreme.
➃ See Operating information section.
MECHANICAL Conditions ➀Minimum Typical/Nominal Maximum Units
Outline Dimensions (open frame) 2.3 x 1.45 x 0.48 Inches
(Please refer to outline drawing) L x W x H 58.4 x 36.83 x 12.19 mm
Outline Dimensions (with baseplate) 2.3 x 1.45 x 0.50 Inches
 58.4 x 36.80 x 12.7 mm
Weight (open frame) TBD Ounces
 Grams
Weight (with baseplate) TBD Ounces
 Grams
Through Hole Pin Diameter 0.04 & 0.062 Inches
 1.016 & 1.575 mm
Digital Interface Pin Diameter 0.02
 0.5
Through Hole Pin Material Copper alloy
TH Pin Plating Metal and Thickness Nickel subplate 98.4-299 µ-inches
Gold overplate 4.7-19.6 µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range with derating -40 85 °C
Operating Baseplate Temperature -40 110 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown (with “B” Suffi x,
default value, Confi gurable via PMBUS) Confi gurable Via PMBus 120 °C
Electromagnetic Interference External fi lter required; see B Class
Conducted, EN55022/CISPR22 emissions performance test.
RoHS rating RoHS-6
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 11 of 31
www.murata-ps.com/support
DBQ0135V2: 12V/35A FUNCTIONAL SPECIFICATIONS (VOLTAGE APPLIED TO SCL SDA SMBALERT AND ON/OFF 2, MIN: -0.3V MAX: 3.6V)
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 0 80 Vdc
Input Voltage, Transient 100 mS max. duration 100 Vdc
Isolation Voltage Input to output 2250 Vdc
On/Off Remote Control Power on, referred to -Vin 0 13.5 Vdc
Output Power 0 428.4 W
Output Current Current-limited, no damage, short-circuit protected 0 35 A
SCL / SDA / SMBALERT / ON/OFF 2 -0.3 3.6 Vdc
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied or recommended.
INPUT
Operating voltage range (V2) 36 48 75 Vdc
Start-up threshold (Default, confi gurable via PMBus) 33 34 35 Vdc
Undervoltage shutdown (Default, confi gurable via PMBus) 31 32 34 Vdc
Internal Filter Type Pi
External Input fuse 20 A
Input current
Full Load Conditions Vin = nominal 9.19 9.44 A
Low Line input current Vin = minimum 12.25 12.59 A
Inrush Transient Vin = 48V. 1.3 2.6 A2-Sec.
Short Circuit input current 0.05 0.1 A
No Load input current Iout = minimum, unit=ON 75 112 mA
Shut-Down input currrent(Off, UV, OT) 20 30 mA
Back Ripple Current 20 40 mAp-p
GENERAL and SAFETY
Isolation Voltage
Input to output 2250 Vdc
Input to Baseplate 1500 Vdc
Output to Baseplate 1500 Vdc
Insulation Safety Rating functional
Isolation Resistance 10 M
Isolation Capacitance 1500 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1, IEC/
EN60950-1, 2nd edition Yes
Calculated MTBF Per Telcordia SR-332, Issue 2, Method 1, Class 1, Ground Fixed,
Tcase=+25°C 1800 Hours x 103
DYNAMIC CHARACTERISTICS
Switching Frequency (Confi gurable via PMBus)
Fixed Frequency Control 175 KHz
Turn On Time (Default, Confi gurable via PMBus)
Vin On to Vout Regulated 60 mS
Remote On to Vout Regulated 25 mS
Vout Rise Time (Default, Confi gurable via PMBus)
From 0%~100% 20 mS
Vout Fall Time of Regulated Off (Default, Confi gurable via PMBus)
From 100%~0% 20 mS
Dynamic Load Response 50-75-50%, 0.1A/us,within 1% of Vout 200 300 µSec
Dynamic Load Peak Deviation same as above ±300 ±500 mV
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 12 of 31
www.murata-ps.com/support
DBQ0135V2 FUNCTIONAL SPECIFICATIONS (CONT.)
FEATURES and OPTIONS Conditions ➀Minimum Typical/Nominal Maximum Units
Remote On/Off Control
Primary On/Off control (designed to be driving with an open collector logic, Voltages referenced to -Vin)
“P” suffi x:
Positive Logic, ON state ON = pin open or external voltage 3.5 13.5 V
Positive Logic, OFF state OFF = ground pin or external voltage 0 0.8 V
Control Current open collector/drain 0.1 0.2 mA
“N” suffi x:
Negative Logic, ON state ON = ground pin or external voltage -0.1 0.8 V
Negative Logic, OFF state OFF = pin open or external voltage 3.5 13.5 V
Control Current open collector/drain 0.1 0.2 mA
Secondary On/Off control (Pull up to 3.3V internally; ignored by default confi guration; see technical notes section) Voltages referenced to -Vout)
“P” suffi x:
Positive Logic, ON state ON = pin open or external voltage 1.5 3.3 V
Positive Logic, OFF state OFF = ground pin or external voltage 0 0.8 V
Control Current open collector/drain 0.03 0.06 mA
“N” suffi x:
Negative Logic, ON state ON = ground pin or external voltage 0 0.8 V
Negative Logic, OFF state OFF = pin open or external voltage 1.5 3.3 V
Control Current open collector/drain 0.03 0.06 mA
Remote Sense Compliance Sense pins connected externally to respective Vout pins
OUTPUT
Total Output Power 0 420 428.4 W
Voltage
Initial Output Voltage
(Default, Confi gurable via PMBus) @VIN = 48V Iout = 0A temp = 25C, both with/without "S" suffi x 11.990 12.030 Vdc
Output Voltage
(Default, Confi gurable via PMBus) @All condtions, without "S" suffi x, VOUT_DROOP = 0 11.760 12.000 12.240 Vdc
Output Voltage
(Default, Confi gurable via PMBus) @All condtions , with"S" suffi x, VOUT_DROOP = 10m (12.000-
Iout*0.01)*0.98 12.000-Iout*0.01 (12.000-
Iout*0.01)*1.02 Vdc
Over-Voltage Protection
(Default, Confi gurable via PMBus)
Direct feedback
Fault response is confi gurable via PMBus 13.80 14.40 15.60 Vdc
Voltage Droop Default, Confi gurable via PMBus
Without "S" suffi x 0m
With "S" suffi x 10 m
Current
Output Current Range 035A
Minimum Load No minimum load
Current Limit Inception ➁90% of Vnom., after warmup, Confi gurable via PMBus 42 A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within 1% of Vout 0.4 1 A
Short Circuit Duration
(remove short for recovery) Output shorted to ground, no damage Continuous
Short circuit protection method, default
response, confi gurable via PMBus Hiccup current limiting Non-latching
Regulation ➂
Line Regulation (V2) Vin = 36-75, Vout = nom., full load 75 mV
Load Regulation (V2)
Vin=nom.
Without S suffi x: Vout@min_load-Vout@max_load
With S suffi x: Vout@min_load-Vout@max_load-Iout*VOUT_DROOP
45 mV
Ripple and Noise 5 Hz- 20 MHz BW, Cout = 1µF
paralleled with 10µF 100 150 mV pk-pk
Temperature Coeffi cient At all outputs 0.01 0.02 % of Vnom./°C
Maximum Output Capacitance Low ESR 10,000 F
Power Good—Negative logic (Confi gurable via PMBus)
Power good high stage voltage 2.4 3.6 Vdc
Power good low stage voltage 0 0.4 Vdc
Out voltage for power good off triggering Confi gurable via PMBus 8.64 9.6 10.56 Vdc
Out Voltage for power good on triggering Confi gurable via PMBus 9.72 10.8 11.88 Vdc
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 13 of 31
www.murata-ps.com/support
DBQ0135V2 FUNCTIONAL SPECIFICATIONS (CONT.)
PMBus Conditions ➀Minimum Typical/Nominal Maximum Units
PMBus GENERAL
PMBus REV. 1.2. SMBALERT# is supported. PEC is supported. Linear data format used.
Bus speed 400 kHz
Logic high input 2 3.3 Vdc
Logic low input 0 0.8 Vdc
Logic high output 2.4 3.6 Vdc
Logic low output -0.1 0.4 Vdc
PMBus ADDRESSING
If the calculated PMBus address is 0d, 11d or 12d, SA0 or SA1 lefts open, default PMBus address 119d is assigned instead. PMBus address = 8x(SA0 value) + (SA1 value). SA0,
SA1 value VS resistor connected to GND.
010 k
122 k
233 k
347 k
468 k
5100 k
6150 k
7220 k
PMBus MONITORING ACCURACY
VIN_READ -2.5 2.5 %
VOUT_READ -1 1 %
IOUT_READ -1 1 A
TEMP_READ -5 5 °C
DIGITAL INTERFACE SPECIFICATIONS (PMBUS MONITORING & FUNCTIONAL DESCRIPTION)
Fault Protection Specifi cations
Output Voltage, Over Voltage protection, OVP Factory default 14.4 V
VOUT_OV_FAULT_LIMIT, Confi gurable via PMBus >VOUT_OV_WARM_LIMIT 8.1 15.6 V
Restart delay (default, Confi gurable via PMBus) 500 mS
VIN_OV_FAULT_LIMIT (Confi gurable via
PMBus) ➃>VIN_OV_WARM_LIMIT 34 110 V
Restart delay (default, Confi gurable via PMBus) 200 mS
Input Voltage, Input Under Voltage Protec-
tion, UVLO Factory default 32 V
Setpoint accuracy -2 2 %
VIN_UV_FAULT_LIMIT (Confi gurable via
PMBus) ➃<VIN_UV_WARM_LIMIT <VIN_OV_FAULT_LIMIT 32 75 V
Restart delay (default, Confi gurable via PMBus) 200 mS
Over Current Protection, OCP Setpoint accuracy (Io) -3 3 %
(factory default) 42 A
IOUT_OC_FAULT_LIMIT (Confi gurable via
PMBus) ➃>IOUT_OC_WARN_LIMT 0 50 A
Restart delay (default, Confi gurable via PMBus) 500 mS
Over Temperature Protection, OTP OT_FAULT_LIMIT (factory default) 120 °C
OT_FAULT_LIMIT (Confi gurable via PMBus) ➃>OT_WARM_LIMIT 0 30 150 °C
OTP accuracy (factory default) 5 5 °C
Restart delay (default, Confi gurable via PMBus) 500 mS
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 14 of 31
www.murata-ps.com/support
Notes
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions. All models are speci-
fi ed with external 1F and 10F capacitors in parallel across their output pins. All values are
default, unless otherwise noted.
➁ Over-current protection is non-latching with auto recovery (hiccup).
➂ Regulation specifi cations describe the output voltage changes as the line voltage or load current
is varied from its nominal or midpoint value to either extreme.
➃ See Operating information section.
MECHANICAL Conditions ➀Minimum Typical/Nominal Maximum Units
Outline Dimensions (open frame) 2.3 x 1.45 x 0.48 Inches
(Please refer to outline drawing) L x W x H 58.4 x 36.83 x 12.19 mm
Outline Dimensions (with baseplate) 2.3 x 1.45 x 0.52 Inches
58.4 x 36.80 x 13.21 mm
Weight (open frame) 1.85 Ounces
52.5 Grams
Weight (with baseplate) 2.35 Ounces
66.8 Grams
Through Hole Pin Diameter 0.04 & 0.062 Inches
1.016 & 1.575 mm
Digital Interface Pin Diameter 0.020
0.5
Through Hole Pin Material Copper alloy
TH Pin Plating Metal and Thickness Nickel subplate 98.4-299 µ-inches
Gold overplate 4.7-19.6 µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range with derating -40 85 °C
Operating Baseplate Temperature -40 110 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown (with "B" Suffi x,
default value, Confi gurable via PMBus) Confi gurable Via PMBus 125 °C
Electromagnetic Interference
Conducted, EN55022/CISPR22
External fi lter required; see
emissions performance test. B Class
RoHS rating RoHS-6
DBQ0135V2 FUNCTIONAL SPECIFICATIONS (CONT.)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 15 of 31
www.murata-ps.com/support
PERFORMANCE DATA
Effi ciency vs. Line Voltage and Load Current @ +25°C
Thermal image at 35A current with 48V input voltage, 30°C ambient temperature, and 100LFM air fl ow. Identifi able and recommended maximum value to be verifi ed in application.
70
80
75
85
90
95
100
0 100 200 300 400
Power Out (Watts)
Efficiency (%)
VIN = 36V
VIN = 48V
VIN = 75V
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 16 of 31
www.murata-ps.com/support
PERFORMANCE DATA: TEMPERATURE DERATING
Open Frame With Baseplate
0
3
6
9
12
15
18
21
24
27
30
33
30 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
33
30
27
24
21
18
15
12
9
6
3
030 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
0
3
6
9
12
15
18
21
24
27
30
33
30 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
39
36
33
30
27
24
21
18
15
12
9
6
3
030 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
39
36
33
30
27
24
21
18
15
12
9
6
3
030 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
39
36
33
30
27
24
21
18
15
12
9
6
3
030 35 40 45 50 55 60 65 70 75 80 85
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Output Current (Amps)
Ambient Temperature
(°C)
Maximum Current Temperature Derating at sea level
(Vin = 36V, airfl ow from Vin to Vout)
Maximum Current Temperature Derating at sea level
(Vin = 48V, airfl ow from Vin to Vout)
Maximum Current Temperature Derating at sea level
(Vin = 75V, airfl ow from Vin to Vout)
Maximum Current Temperature Derating at sea level
(Vin = 36V, airfl ow from Vin to Vout)
Maximum Current Temperature Derating at sea level
(Vin = 48V, airfl ow from Vin to Vout)
Maximum Current Temperature Derating at sea level
(Vin = 75V, airfl ow from Vin to Vout)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 17 of 31
www.murata-ps.com/support
PERFORMANCE DATA
Startup Delay (Vin = 48V, Iout = 35A, Cout = 1000uF, Ta = +25°C)
Ch1 = Vin, Ch2 = Vout
Output Ripple & Noise (Vin = 48V, Iout = 35A, Cout = 1uF || 10uF, Ta = +25°C)
Stepload Transient Response (Vin = 48V, Iout = 50-75-50% of Iout, Cload = 1uF || 10uF,
slew rate: 0.1A/us, Ta = +25°C)
Enable Startup Delay (Vin = 48V, Iout = 35A, Cout = 1000uF, Ta = +25°C)
Ch2 = Vout Ch4 = Enable
Output Ripple & Noise (Vin = 48V, Iout = 0A, Cout = 1uF || 10uF, Ta = +25°C)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 18 of 31
www.murata-ps.com/support
MECHANICAL SPECIFICATIONS
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only
and may vary between units.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
INPUT/OUTPUT CONNECTIONS
Pin Designation Function
1 +VIN Positive Input
2 On/Off 1 Control Primary On/Off Control
3 No Pin No Pin
4 –VIN Negative Input
5 –VOUT Negative Output
6 +S Positive Remote Sense
7 –S Negative Remote Sense
8 SA0 Address Pin 0
9 SA1 Address Pin 1
10 SCL PMBus Clock
11 SDA PMBus Data
12 PG Power Good Output
13 DGND PMBus Ground
14 SMBALERT PMBus Alert Signal
15 On/Off 2 Control Secondary On/Off Control
16 +VOUT Positive Output
0.315
0.079
0.079
10 13
1
2
5
8
6
16
SQ.0.02
highest component
SEE NOTE 6
between standoffs and
0.010 minimum clearance
0.48 Max
PIN SIDE VIEW
between standoffs and
highest component
PINS 1,2,4:
Î0.040±0.0015(1.016±0.038)
Shoulder: Î0.076±0.005(1.93±0.13)
PINS 5,16:
Î0.062±0.0015(1.575±0.038)
Shoulder: Î0.098±0.005(2.49±0.13)
0.010 minimum clearance
0.52 Max
M3 THREAD TYP 4PL
0.210
0.220
PINS 1,2,4,:
Î0.040±0.0015(1.016±0.038)
Shoulder: Î0.076±0.005(1.93±0.13)
PINS 5,16:
Î0.062±0.0015(1.575±0.038)
Shoulder: Î0.098±0.005(2.49±0.13)
4
WITH BASEPLATE OPTION
9
7
11
12
14
NOTES:
15
UNLESS OTHERWISE SPECIFIED;
1:M3 SCREW USED TO BOLT UNIT'S BASEPLATE TO OTHER SURFACES
(SUCH AS HEATSINK) MUST NOT EXCEED 0.100''(2.54mm) DEPTH BELOW
THE SURFACE OF BASEPLATE
2:APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb(0.6Nm);
3:ALL DIMENSION ARE IN INCHES[MILIMETER];
4:ALL TOLERANCES: ×.××in ,±0.02in(×.×mm,±0.5mm)
×.×××in ,±0.01in(×.××mm,±0.25mm)
5:COMPONENT WILL VARY BETWEEN MODELS
6:STANDARD PIN LENGTH: 0.180 Inch
PIN SIDE VIEW
OPEN FRAME
FOR L1 PIN LENGTH OPTION IN MODEL NAME,
THE L LENGTH SHOULD BE 0.110 INCH
FOR L2 PIN LENGTH OPTION IN MODEL NAME.,
USE STANDARD L2 PIN WITH PIN LENGTH TO 0.145 Inch
0.600 (15.24)
2.30 (58.4)
2.30 (58.4)
2.000 (50.8)
2.000 (50.8)
0.600
(15.24)
1.030 (26.16)
1.860 (47.24)
1.45 (36.83)
1.45 (36.83)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 19 of 31
www.murata-ps.com/support
Each static dissipative polyethylene
foam tray accommodates
15 converters in a 3 x 5 array.
9.92
(251.97)
REF
9.92
(251.97)
REF
0.88 (22.35)
REF
Carton accommodates two (2) trays yielding 30 converters per carton
10.50 (266.7) ±.25
11.00 (279.4) ±.25
2.75 (69.85) ±.25
closed height
STANDARD PACKAGING
Third Angle Projection
Dimensions are in inches (mm) shown for ref. only.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 20 of 31
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Power Management Overview
The module includes a wide range of readable and confi gurable power
management features that are easy to implement with a minimum of external
components. Furthermore, the module includes protection features that
continuously protect the load from damage due to unexpected system faults.
The SMBALERT pin alerts the host if there is a fault in the module. The follow-
ing product parameters can continuously be monitored by a host: Vout, Iout,
Vin, Temperature, and Power Good. The module is distributed with a default
confi guration suitable for a wide range operation in terms of Vin, Vout, and
load. All power management functions can be reconfi gured using the PMBus
interface. The product provides a PMBus digital interface that enables the user
to confi gure many aspects of the device operation as well as monitor the input
and output parameters. Please contact our FAE for special confi gurations.
Soft-start Power Up
The default rise time of the ramp up is 20 ms. When starting by applying
input voltage the control circuit boot-up time adds an additional 10 ms delay.
The soft-start power up of the module can be reconfi gured using the PMBus
interface.
Over Voltage Protection (OVP)
The module includes over voltage limiting circuitry for protection of the load.
The default OVP limit is 20% above the nominal output voltage. If the output
voltage surpasses the OVP limit, the module can respond in different ways.
The default response from an over voltage fault is to immediately shut down.
The device will continuously check for the presence of the fault condition,
and when the fault condition no longer exists the device will be re-enabled.
The OVP fault level and fault response can be reconfi gured using the PMBus
interface.
Over Current Protection (OCP, Current limit)
The module includes current limiting circuitry for protection at continuous over
load. The default setting for the product is hicup mode. The current limit could
be confi gured by simply setting the IOUT_OC_FAULT_LIMIT to be greater than
the IOUT_OC_WARN_LIMIT. The maximum value that the current limit could be
set is 50A.
TECHNICAL NOTES
Power Good
The module provides Power Good (PG) fl ag in the Status Word register that
indicates the output voltage is within a specifi ed tolerance of its target level
and no fault condition exists. The Power Good pin default logic is negative and
it can be confi gured by MFR_PGOOD_POLARITY.
PMBus Interface
This module offers a PMBus digital interface that enables the user to confi gure
many characteristics of the device operation as well as to monitor the input
and output voltages, output current and device temperature. The module can
be used with any standard two-wire I2C or SMBus host device. In addition, the
module is compatible with PMBus version 1.2 and includes an SMBALERT line
to help alleviate bandwidth limitations related to continuous fault monitoring.
The module supports 100 kHz and 400 kHz bus clock frequency only.
Monitoring via PMBus
A system controller (host device) can monitor a wide variety of parameters
through the PMBus interface. The controller can monitor fault conditions by
monitoring the SMBALERT pin, which will be asserted when any number of
pre-confi gured fault or warning conditions occur. The system controller can
also continuously monitor any number of power conversion parameters includ-
ing but not limited to the following:
• Input voltage
• Output voltage
• Output current
• Module temperature
Software Tools for Design and Production
For these modules, Murata-PS provides software for confi guring and monitor-
ing via the PMBus interface. For more information please contact your local
Murata-PS representative.
Click here for Application Note AN-63, Digital DC-DC Evaluation Board
User Guide.
Click here for Application Note AN-64, Murata Power Brick GUI User Manual.
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 21 of 31
www.murata-ps.com/support
PMBus Addressing
Figure 1 and the accompanying table display the recommended resistor values
for hard-wiring PMBus addresses (1% tolerance resistors recommended): The
address is set in the form of two octal (0 to 7) digits, with each pin setting one
digit. The resistor values for each digit is shown below.
The SA0 and SA1 pins can be confi gured with a resistor to GND according to
the following equation.
PMBus Address = 8 x (SA0value) + (SA1 value)
C0 and C1 are 4.7nF capacitors, which are recommended for correct
addressing. If the calculated PMBus address is 0d, 11d or 12d, PMBus address
119d is assigned instead. From a system point of view, the user shall also be
aware of further limitations of the addresses as stated in the PMBus Specifi ca-
tion. It is not recommended to keep the SA0 and SA1 pins left open.
PMBus Commands
The products are designed to be PMBus compliant. The following tables list
the implemented PMBus read commands. For more detailed information see
“PMBus Power System Management Protocol Specifi cation, Part I – General
Requirements, Transport and Electrical Interface” and “PMBus Power System
Management Protocol, Part II – Command Language.”
Figure 1. Schematic of Connection of Address Resistors
SA0
SA1
R1
C1
C0
R0
Digit (SA0, SA1 index) Resistor Value [kΩ]
010
122
233
347
468
5 100
6 150
7 220
OVERALL
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 22 of 31
CMD Command Name1
SMBus
Transaction Type:
Writing Data
SMBus
Transaction Type:
Reading Data
Number
Of Data
Bytes
01h OPERATION2Write Byte Read Byte 1
02h ON_OFF_CONFIG3Write Byte Read Byte 1
03h CLEAR_FAULTS Send byte N/A 0
10h WRITE_PROTECT Write Byte Read Byte 1
11h STORE_DEFAULT_ALL4Send byte N/A 0
12h RESTORE_DEFAULT_ALL4Send byte N/A 0
15h STORE_USER_ALL4Send byte N/A 0
16h RESTORE_USER_ALL4Send byte N/A 0
19h CAPABILITY N/A Read Byte 1
20h VOUT_MODE N/A Read Byte 1
21h VOUT_COMMAND Write Word Read Word 2
22h VOUT_TRIM Write Word Read Word 2
25h VOUT_MARGIN_HIGH Write Word Read Word 2
26h VOUT_MARGIN_LOW Write Word Read Word 2
28h VOUT_DROOP Write Word16 Read Word 2
40h VOUT_OV_FAULT_LIMIT Write Word Read Word 2
41h VOUT_OV_FAULT_RESPONSE5Write Byte Read Byte 1
42h VOUT_OV_WARN_LIMIT Write Word Read Word 2
46h IOUT_OC_FAULT_LIMIT Write Word Read Word 2
47h IOUT_OC_FAULT_RESPONSE6Write Byte Read Byte 1
4Ah IOUT_OC_WARN_LIMIT Write Word Read Word 2
4Fh OT_FAULT_LIMIT Write Word Read Word 2
50h OT_FAULT_RESPONSE5Write Byte Read Byte 1
51h OT_WARN_LIMIT Write Word Read Word 2
55h VIN_OV_FAULT_LIMIT Write Word Read Word 2
56h VIN_OV_FAULT_RESPONSE7Write Byte Read Byte 1
57h VIN_OV_WARN_LIMIT Write Word Read Word 2
58h VIN_UV_WARN_LIMIT Write Word Read Word 2
59h VIN_UV_FAULT_LIMIT Write Word Read Word 2
5Ah VIN_UV_FAULT_RESPONSE7Write Byte Read Byte 1
5Eh POWER_GOOD_ON Write Word Read Word 2
5Fh POWER_GOOD_OFF Write Word Read Word 2
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DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 23 of 31
CMD Command Name1
SMBus
Transaction Type:
Writing Data
SMBus
Transaction Type:
Reading Data
Number
Of Data
Bytes
60h TON_DELAY Write Word16 Read Word 2
61h TON_RISE14 Write Word16 Read Word 2
64h TOFF_DELAY Write Word16 Read Word 2
65h TOFF_FALL14 Write Word16 Read Word 2
78h STATUS_BYTE Write Byte Read Byte 1
79h STATUS_WORD Write Word Read Word 2
7Ah STATUS_VOUT Write Byte Read Byte 1
7Bh STATUS_IOUT Write Byte Read Byte 1
7Ch STATUS_INPUT Write Byte Read Byte 1
7Dh STATUS_TEMPERATURE Write Byte Read Byte 1
7Eh STATUS_CML Write Byte Read Byte 1
88h READ_VIN N/A Read Word 2
8Bh READ_VOUT N/A Read Word 2
8Ch READ_IOUT N/A Read Word 2
8Dh READ_TEMPERATURE_18N/A Read Word 2
94h READ_DUTY_CYCLE N/A Read Word 2
95h READ_FREQUENCY N/A Read Word 2
96h READ_POUT N/A Read Word 2
98h PMBus_REVISION N/A Read Byte 1
99h MFR_ID N/A Block Read 22
9Ah MFR_MODEL9N/A Block Read <=20
9Bh MFR_REVISION9N/A Block Read <=10
9Dh MFR_DATE9N/A Block Read <=10
9Eh MFR_SERIAL9N/A Block Read <=10
A0h MFR_VIN_MIN N/A Read Word 2
A1h MFR_VIN_MAX N/A Read Word 2
A2h MFR_IIN_MAX N/A Read Word 2
A3h MFR_PIN_MAX N/A Read Word 2
A4h MFR_VOUT_MIN N/A Read Word 2
A5h MFR_VOUT_MAX N/A Read Word 2
A6h MFR_IOUT_MAX N/A Read Word 2
A7h MFR_POUT_MAX N/A Read Word 2
A8h MFR_TAMBIENT_MAX N/A Read Word 2
A9h MFR_TAMBIENT_MIN N/A Read Word 2
B0h USER_DATA_00 Block Write Block Read <=20
B1h USER_DATA_01 Block Write Block Read <=20
C0h MFR_MAX_TEMP_1 N/A Read Word 2
DBh MFR_CURRENT_SHARE_CONFIG N/A Read Byte 1
DDh MFR_PRIMARY_ON_OFF_CONFIG Write Byte Read Byte 1
DEh MFR_PGOOD_POLARITY Write Byte Read Byte 1
E8h MFR_VIN_OV_FAULT_HYS Write Word Read Word 2
E9h MFR_VIN_UV_FAULT_HYS Write Word Read Word 2
EAh MFR_OT_FAULT_HYS Write Word Read Word 2
OVERALL (CONT.)
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MURATA-PS DEFINED COMMANDS (01-CFH REFER TO PMBUS 1.2 SPEC)
DBh: MFR_CURRENT_SHARE_CONFIG
Bits Purpose Value Meaning
7:1 0000000 Reserved
0Droop Current Share
Control
0 Current share disabled
1 Droop current share mode enabled
DDh: MFR_PRIMARY_ON_OFF_CONFIG
Bits Purpose Value Meaning
7:3 00000 Reserved
2
Controls how the
unit responds to the
CONTROL pin
0 Unit ignores the primary ON/OFF pin
1Unit requires the primary ON/OFF pin to be
asserted to start the unit.
1Polarity of primary
ON/OFF logic
0 Active low (Pull pin low to start the unit)
1 Active high (Pull high or open to start the unit)
0 0 Reserved
DEh: MFR_ PGOOD_POLARITY
Bits Purpose Value Meaning
7:1 0000000 Reserved
0Power good polarity
of pin 12
0Negative logic, output low if Vout rises to
specifi c value
1Positive logic, output high if Vout rises to
specifi c value
Notes:
1. a) Unit restores the entire contents of the non-volatile User Store memory when power up
b) PEC is supported
c) Max bus speed: 400kHZ
d) SMBALERT# is supported
e) Linear data format used
f) addressing: If the calculated PMBus address is 0d, 11d or 12d, SA0 or SA1 lefts open, default
PMBus address 119d is assigned instead.
2. Not supported items:
100101XXb Margin Low(Ignore Fault),
101001XXb On Margin High(Ignore Fault)
3. Restart delay of turned off by OPEATION or CONTROL or primary on/off is 200ms
4. Unit will shutdown 1 second for protection , then recover automatically.
5. Restart delay unit: 500ms, lower limit: 500ms.
Turn off delay unit: 0ms, lower limit: 0ms
if bits 7:6=11b, restart delay is 500ms
6. Restart delay unit and Turn off delay unit are same as note 5
Bits 7:6: 00b,01b,10b are not supported
7. Restart delay unit: 200ms, lower limit: 200ms.
Turn off delay unit:0ms, lower limit: 0ms
if bits 7:6=11b, restart delay is 200ms
8. Temperature of baseplate side
9. Unit's actual information
10. Default value of DROOP CURRENT SHARE ENABLED mode: 0x01
Default value of DROOP CURRENT SHARE DISABLED mode: 0x00
11. Locked to 10m in DROOP CURRENT SHARE mode; confi gurable and default value is 0m in
CURRENT SHARE DISABLED mode
12. Default value of negative logic: 0x04
Default value of positive logic: 0x06
13. Unit can receive any value for VOUT_TRIM command, but Vout is limited to 8.1~13.2V, if calcu-
lated Vout exceeds limit, then equal to limit.
14. Value of 0 is acceptable, which is the same as lower limit to unit.
15. Default value of without "B" suffi x: 120°C
Default value of with "B" suffi x: 125°C
16. Confi gurable while without "S" suffi x locked while with "S" suffi x
On/Off 2 pin VOUT_DROOP TON_DELAY TOFF_DELAY TON_RISE TOFF_FALL
-- -- -- -- -- --
On/Off 2 confi gurable confi gurable confi gurable confi gurable confi gurable
On/Off 2 locked to 0x000A locked to 0x0001 locked to 0x0000 locked to 0x0000 locked to 0x0000
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 24 of 31
OVERALL (CONT.)
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STATUS WORD AND BYTE (GREEN = SUPPORTED)
STATUS_VOUT
7 VOUT_OV_FAULT
6 VOUT_OV_WARNING
5 VOUT_UV_WARNING
4 VOUT_UV_FAULT
3 VOUT_MAX Warning
2 TON_MAX_FAULT
1 TOFF_MAX_WARNING
0 VOUT Tracking Error
STATUS_IOUT
7 IOUT_OC_FAULT
6 IOUT_OC_LV_FAULT
5 IOUT_OC_WARNING
4 IOUT_UC_FAULT
3 Current Share Fault
2 In Power Limiting Mode
1 POUT_OP_FAULT
0 POUT_OP_WARNING
STATUS_TEMPERATURE
7 OT_FAULT
6 OT_WARNING
5 UT_WARNING
4 UT_FAULT
3 Reserved
2 Reserved
1 Reserved
0 Reserved
STATUS_CML
7 Invalid/Unsupported Command
6 Invalid/Unsupported Data
5 Packet Error Check Failed
4 Memory Fault Detected
3 Processor Fault Detected
2 Reserved
1 Other Communication Fault
0 Other Memory Or Logic Fault
STATUS_WORD
7 VOUT
6 IOUT/POUT
5 INPUT
4 MFR_SPECIFIC
3 POWER_GOOD#
2 FANS
1 OTHER
0 UNKNOWN
7 BUSY
6 OFF
5 VOUT_OV_FAULT
4 IOUT_OC_FAULT
3 VIN_UV_FAULT
2 TEMPERATURE
1 CML
0 NONE OF THE ABOVE
STATUS_OTHER
7 Reserved
6 Reserved
5 Input A Fuse/Breaker Fault
4 Input B Fuse/Breaker Fault
3 Input A OR-ing Device Fault
2 Input B OR-ing Device Fault
1 Output OR-ing Device Fault
0 Reserved
STATUS_INPUT
7 VIN_OV_FAULT
6 VIN_OV_WARNING
5 VIN_UV_WARNING
4 VIN_UV_FAULT
2 IIN_OC_FAULT
1 IIN_OC_WARNING
0 PIN_OP_WARNING
STATUS_MFR_SPECIFIC
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
Manufacturer Defi ned
STATUS_FANS_1_2
7 Fan 1 Fault
6 Fan 2 Fault
5 Fan 1 Warning
4 Fan 2 Warning
3 Fan 1 Speed Override
2 Fan 2 Speed Override
1 Air Flow Fault
0 Air Flow Warning
STATUS_FANS_3_4
7 Fan 3 Fault
6 Fan 4 Fault
5 Fan 3 Warning
4 Fan 4 Warning
3 Fan 3 Speed Override
2 Fan 4 Speed Override
1 Reserved
0 Reserved
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 25 of 31
www.murata-ps.com/support
TECHNICAL NOTES (CONT.)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 26 of 31
Parallel Load Sharing (S Option, Droop Load Sharing)
Two or more converters may be connected in parallel at both the input and
output terminals to support higher output current (total power, see fi gure 2) or
to improve reliability due to the reduced stress that results when the modules
are operating below their rated limits. For applications requiring current share,
followed the guidelines below. The products have a pre-confi gured voltage
droop. The stated output voltage set point is at no load. The output voltage
will decrease when the load current is increased. The voltage will drop 0.35V
while load reaches max load. Our goal is to have each converter contribute
nearly identical current into the output load under all input, environmental and
load conditions.
Using Parallel Connections – Load Sharing (Power Boost)
Direct Connection Parallel Guidelines
Use a common input power source. The input voltage must be between 36V
and 75V.
+Vout and –Vout of all parallel units should be connected with a balance
output impedance; +Sense and –Sense should be connected together (see
fi gure 2).
Turn all units off before confi guring the output voltage via PMBus com-
mands; all units must have the same output voltage confi guration.
It is recommended to turn on one unit fi rst and then turn other unit (s) on
after the output for the fi rst one has settled. Turn on the next unit (s) after the
previous unit reaches its regulated output voltage for at least 10mS. Users
can use a different control signal to turn each unit on.
Users have the option to use a common primary or secondary Remote On/
Off logic control signal to turn on modules at the same time after the input
voltage rises above 36V.
If using PMBus to control units ON/OFF in parallel operation, we suggest to
control one unit on fi rst. After the output voltage is stable, then make other
units' output on.
First power up the parallel system (all converters) with a load not exceeding
the rated load of 60%*35A*UNITS_QUANTITY and allow converters to settle
(typically 20mS) before applying full load (90% load is recommended).
When converters are connected in parallel, allow for a safety factor of at
least 10%. Up to 90% of max output current can be used from each module.
It is critical that the PCB layout incorporates identical connections from each
module to the load; use the same trace rating and airfl ow/thermal environ-
ments. If you add output fi lter components, use identical components and
layout.
For Power-down, do not soft-off (GUI) while in parallel operation. Power
down units by primary or secondary On/Off signal. Turn units off at the
same time or one by one to avoid the OCP being triggered.
CAUTION: This converter is not internally fused. To avoid danger to persons
or equipment and to retain safety certifi cation, the user must connect an
external fast-blow input fuse as listed in the specifi cations. Be sure that the PC
board pad area and etch size are adequate to provide enough current so that
the fuse will blow with an overload.
Using Parallel Connections – Redundancy (N+1)
The redundancy connections require external user supplied “OR”ing diodes or
“OR”ing MOSFETs for reliability purposes. The diodes allow for an uninterrupt-
able power system operation in case of a catastrophic failure (shorted output)
by one of the converters.
The diodes should be identical part numbers to enhance balance between
the converters. The default factory nominal voltage should be suffi ciently
matched between converters. The OR’ing diode system is the responsibility of
the user. Be aware of the power levels applied to the diodes and possible heat
sink requirements.
Schottky power diodes with approximately 0.3V drops or “OR”ing MOSFETs
may be suitable in the loop whereas 0.7 V silicon power diodes may not be
advisable. In the event of an internal device fault or failure of the mains power
modules on the primary side, the other devices automatically take over the
entire supply of the loads. In the basic N+1 power system, the “N” equals the
number of modules required to fully power the system and “+1” equals one
back-up module that will take over for a failed module. If the system consists
of two power modules, each providing 50% of the total load power under
normal operation and one module fails, another one delivers full power to the
load. This means you can use smaller and less expensive power converters as
the redundant elements, while achieving the goal of increased availability.
Thermal Shutdown
Extended operation at excessive temperature will initiate overtemperature
shutdown triggered by a temperature sensor outside the PWM controller. This
operates similarly to overcurrent and short circuit mode. The inception point
of the overtemperature condition depends on the average power delivered,
the ambient temperature and the extent of forced cooling airfl ow. Thermal
shutdown uses only the hiccup mode (autorestart) and PMBus confi gurable
hysteresis.
Start Up Considerations
When power is fi rst applied to the DC-DC converter, there is some risk of start
up diffi culties if you do not have both low AC and DC impedance and adequate
regulation of the input source. Make sure that your source supply does not allow
the instantaneous input voltage to go below the minimum voltage at all times.
Use a moderate size capacitor very close to the input terminals. You may
need two or more parallel capacitors. A larger electrolytic or ceramic cap sup-
plies the surge current and a smaller parallel low-ESR ceramic cap gives low
AC impedance.
Remember that the input current is carried both by the wiring and the
ground plane return. Make sure the ground plane uses adequate thickness
copper. Run additional bus wire if necessary.
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
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Input Under-Voltage Shutdown and Start-Up Threshold
Converters will not begin to regulate properly until the rising input voltage
exceeds and remains at the Start-Up Threshold Voltage (see Specifi cations).
Once operating, converters will not turn off until the input voltage drops below
the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the
input voltage rises again above the Start-Up Threshold. This built-in hysteresis
prevents any unstable on/off operation at a single input voltage. The over/
under-voltage fault level and fault response and hysterisis can be confi gured
via the PMBus interface.
Start-Up Time
Start-Up Time (see Specifi cations) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the output voltage
enters and remains within its specifi ed accuracy band.
These converters include a soft start circuit to control Vout ramp time,
thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout (fi nal ±5%)
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specifi ed accuracy
band.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. More
input bulk capacitance may be added in parallel (either electrolytic or tantalum)
if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capaci-
tance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Mount these close to the converter. Measure the output ripple under your load
conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capaci-
tance listed in the specifi cations.
Input Ripple Current and Output Noise
All models in this converter series are tested and specifi ed for input refl ected
ripple current and output noise using designated external input/output com-
ponents, circuits and layout as shown in the fi gures below. The Cbus and Lbus
components simulate a typical DC voltage bus.
Minimum Output Loading Requirements
All models regulate within specifi cation and are stable under no load to full
load conditions.
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 27 of 31
Figure 2. Load Sharing Block Diagram
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C
IN
V
IN
C
BUS
L
BUS
C
IN
= 220µF, ESR < 700mΩ @ 100kHz
C
BUS
= 220µF, ESR < 100mΩ @ 100kHz
L
BUS
= 12µH
+Vin
-Vin
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
Figure 3. Measuring Input Ripple Current
Thermal Shutdown (OTP, UTP)
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC-DCs to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold set in the command recover temp is (OT_FAULT_LIMIT-MFR_OT_
FAULT_HYS), the hysteresis is defi ned in general electrical specifi cation
section. The OTP and hysteresis of the module can be reconfi gured using the
PMBus. The OTP and UTP fault limit and fault response can be confi gured via
the PMBus.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airfl ow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airfl ow as long as the average is not exceeded.
Note that the temperatures are of the ambient airfl ow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that “natural convection” is defi ned as very fl ow rates which are not
using fan-forced airfl ow. Depending on the application, “natural convection” is
usually about 30-65 LFM but is not equal to still air (0 LFM).
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airfl ow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite diffi cult to insert an anemometer to precisely measure airfl ow in
most applications. Sometimes it is possible to estimate the effective airfl ow if
you thoroughly understand the enclosure geometry, entry/exit orifi ce areas and
the fan fl owrate specifi cations.
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Short Circuit Condition
The short circuit condition is an extension of the “Current Limiting” condition.
When the monitored peak current signal reaches a certain range, the PWM
controller’s outputs are shut off thereby turning the converter “off.” This is
followed by an extended time out period. This period can vary depending on
other conditions such as the input voltage level. Following this time out period,
the PWM controller will attempt to re-start the converter by initiating a “normal
start cycle” which includes softstart. If the “fault condition” persists, another
“hiccup” cycle is initiated. This “cycle” can and will continue indefi nitely until
such time as the “fault condition” is removed, at which time the converter will
resume “normal operation.” Operating in the “hiccup” mode during a fault
condition is advantageous in that average input and output power levels are
held low preventing excessive internal increases in temperature.
Remote On/Off Control
The DBQ series modules are equipped with both primary (On/Off 1, enabled,
pull up internal) and secondary (On/Off 2, disabled, pull up internal) control pins
for increased system fl exibility. Both are confi gurable via PMBus. The On/Off
pins are TTL open-collector and/or CMOS open-drain compatible. (See general
specifi cations for threshold voltage levels. See also MFR_PRIMARY_ON_OFF_
CONFIG section.)
Negative-logic models are on (enabled) when the On/Off is grounded or
brought to within a low voltage (see specifi cations) with respect to –Vin.
The device is off (disabled) when the On/Off is left open or is pulled high to
+13.5Vdc with respect to –Vin. The On/Off function allows the module to be
turned on/off by an external device switch.
Positive-logic models are enabled when the On/Off pin is left open or is
pulled high to +13.5V with respect to –Vin. Positive-logic devices are disabled
when the On/Off is grounded or brought to within a low voltage (see specifi ca-
tions) with respect to –Vin. For voltage levels for On/Off 2 signal see functional
specifi cations.
The restart delay for this module to turn On/Off by the On/Off control pin is
200ms.
C1 = 1µF; C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
R
LOAD
C1 C2 SCOPE
+Vout
-Vout
Figure 4. Measuring Output Ripple and Noise (PARD)
On/Off 1 or 2 Control status
Not ignored Ignored
On/Off 1 or 2 pin P LOGIC N LOGIC P LOGIC N LOGIC
OPEN ON OFF ON ON
PULL HIGH ON OFF ON ON
PULL LOW OFF ON ON ON
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 28 of 31
www.murata-ps.com/support
On/Off 1 can be confi gured by PMBus command MFR_PRIMARY_ON_OFF_
CONFIG (DDh); default confi guration is not ignored; required On/Off 1 control
pin to be asserted to start the unit.
On/Off 2 can be confi gured by PMBus command ON_OFF_CONFIG (02h);
default confi guration is ignored; treat it as always ON.
DBQ's On/Off status is dependent on On/Off 1 control, On/Off 2 control, and
OPERATION (PMBus command) status; all three must be ON to turn DBQ on; if
one of them is OFF, unit will be turned off.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifi cations. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause degraded transient response and possible oscillation or instability.
Remote Sense Input
Use the Sense inputs with caution. Sense is normally connected at the load.
Sense inputs compensate for output voltage inaccuracy delivered at the load.
Figure 5. Remote Sense Circuit Confi guration
LOAD
Contact and PCB resistance
losses due to IR drops
Contact and PCB resistance
losses due to IR drops
+VOUT
+SENSE
−
SENSE
-VOUT
−V
IN
ON/OFF
CONTROL
+
V
IN
Sense Current
IOUT
Sense Return
IOUT Return
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations may cause damage to the product. Be cautious when there is high atmo-
spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your
production environment may differ; therefore please thoroughly review these guidelines
with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature 115° C.
Maximum Pot Temperature 270° C.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 6 seconds
This is done by correcting IR voltage drops along the output wiring and the
current carrying capacity of PC board etch. This output drop (the difference
between Sense and Vout when measured at the converter) should not exceed
0.5V. Consider using heavier wire if this drop is excessive. Sense inputs also
improve the stability of the converter and load system by optimizing the control
loop phase margin.
Note: The Sense input and power Vout lines are internally connected through
low value resistors to their respective polarities so that the converter can
operate without external connection to the Sense. Nevertheless, if the Sense
function is not used for remote regulation, the user should connect +Sense to
+Vout and –Sense to –Vout at the converter pins.
The remote Sense lines carry very little current. They are also capacitively
coupled to the output lines and therefore are in the feedback control loop to
regulate and stabilize the output. As such, they are not low impedance inputs
and must be treated with care in PC board layouts. Sense lines on the PCB
should run adjacent to DC signals, preferably Ground. In cables and discrete
wiring, use twisted pair, shielded tubing or similar techniques.
Any long, distributed wiring and/or signifi cant inductance introduced into the
Sense control loop can adversely affect overall system stability. If in doubt, test
your applications by observing the converter’s output transient response during
step loads. There should not be any appreciable ringing or oscillation. You
may also adjust the output trim slightly to compensate for voltage loss in any
external fi lter elements. Do not exceed maximum power ratings.
Please observe Sense inputs tolerance to avoid improper operation:
[Vout(+) −Vout(-)] − [Sense(+) −Sense(-)] ≤ 5% of Vout
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protec-
tion circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must
ensure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 29 of 31
www.murata-ps.com/support
Emissions Performance
Murata Power Solutions measures its products for conducted emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
2Line V-networks LS1-15V 50/50Uh Line Impedance Stabilization Network
[3] Conducted Emissions Test Results
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN-02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Reference Part Number Description Vendor
C1, C2, C3, C4, C5 GRM32ER72A105KA01L SMD CERAMIC-100V-
1000nF-X7R-1210 Murata
C6 GRM319R72A104KA01D SMD CERAMIC100V-100nF-
±10%-X7R-1206 Murata
L1, L2 PG0060T COMMON MODE-473uH-
±25%-14A Pulse
C8, C9, C10, C11 GRM55DR72J224KW01L SMD CERAMIC630V-0.22uF-
±10%-X7R-2220 Murata
C7 UHE2A221MHD Aluminum100V-220Uf-
±10%-long lead Nichicon
C12 NA
LOAD
C2 L1
C6 C7 DC/DC C12
++
VCC
RTN
-48V
GND
GND
C3C1 L2
C5C4
C8 C9 C10 C11
Figure 6. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, full load
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, full load
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 30 of 31
www.murata-ps.com/support
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2016 Murata Power Solutions, Inc.
DBQ/DVQ Series
420W Digital Fully Regulated Intermediate
DC-DC Bus Converter
MDC_DBQ Series.B02Δ Page 31 of 31
Figure 7. Vertical Wind Tunnel
IR Video
Camera
IR Transparent
optical window Variable
speed fan
Heating
element
Ambient
temperature
sensor
Airflow
collimator
Precision
low-rate
anemometer
3” below UUT
Unit under
test (UUT)
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airfl ow and heat dissipation analysis of power products.
The system includes a precision low fl ow-rate anemometer,
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
Both through-hole and surface mount converters are
soldered down to a 10" x 10" host carrier board for realistic
heat absorption and spreading. Both longitudinal and trans-
verse airfl ow studies are possible by rotation of this carrier
board since there are often signifi cant differences in the heat
dissipation in the two airfl ow directions. The combination of
adjustable airfl ow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airfl ow turbulence. Such turbu-
lence infl uences the effective heat transfer characteristics
and gives false readings. Excess turbulence removes more
heat from some surfaces and less heat from others, possibly
causing uneven overheating.
Both sides of the UUT are studied since there are differ-
ent thermal gradients on each side. The adjustable heating
element and fan, built-in temperature gauges, and no-contact
IR camera mean that power supplies are tested in real-world
conditions.