DS_Q36SR12020NRFA_11252015
FEATURES
High efficiency: 93% @ 12V/20A
Size:
58.4x36.8x11.7mm
(2.30”x1.45”x0.46”) w/o heat-spreader
58.4x36.8x12.7mm
(2.30”x1.45”x0.50”) with heat-spreader
Industry standard footprint and pin out
Fixed frequency operation
Input UVLO
OTP and OVP
Output OCP hiccup mode
Output voltage trim down : -10%
Output voltage trim up: +10% at Vin>20V
Monotonic startup into normal and
pre-biased loads
2250V isolation and basic insulation
No minimum load required
No negative current during power or enable
on/off
ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950-1 (US & Canada)
APPLICATIONS
Optical Transport
Data Networking
Communications
Servers
OPTIONS
Negative or positive logic remote On/Off
Through hole with heat-spreader
Q36SR12020NRFA, Quarter Brick 240W
DC/DC Power Module: 18V~75Vin,12V, 20Aout
Q36SR12020NRFA, Quarter Brick, 18V~75Vin input, single output,
isolated DC/DC converters, are the latest offering from a world leader
in power systems technology and manufacturing ― Delta Electronics,
Inc. With creative design technology and optimization of component
placement, these converters possess outstanding electrical and
thermal performance, as well as extremely high reliability under highly
stressful operating conditions. Typical efficiency of the 12V/20A
module is greater than 93%.
Q36SR12020NRFA_11252015
2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
Note1: For applications with higher output capacitive load, please contact Delta
Note2: Trim down range -10% for 18Vin ~75Vin, Trim up range +10% for 20Vin ~ 75Vin.
PARAMETER
NOTES and CONDITIONS
Q36SR12020NRFA(STD)
Min.
Typ.
Max.
Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Vdc
Continuous
0
80
Vdc
Transient (100ms)
100ms
100
Vdc
Operating Ambient Temperature
-40
85
°C
Storage Temperature
-55
125
°C
Input/Output Isolation Voltage
2250
Vdc
INPUT CHARACTERISTICS
Operating Input Voltage
18
48
75
Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold
16
17
18
Vdc
Turn-Off Voltage Threshold
15
16
17
Vdc
Lockout Hysteresis Voltage
0.3
1
1.8
Vdc
Maximum Input Current
100% Load, 18Vin
17.2
A
No-Load Input Current
Vin=48V,Io=0A
100
mA
Off Converter Input Current
Vin=48V
10
mA
Inrush Current (I2t)
1
A2s
Input Reflected-Ripple Current
P-P thru 12µH inductor, 5Hz to 20MHz
20
mA
Input Voltage Ripple Rejection
120 Hz
50
dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Vin=48V, Io=Io.max, Tc=25°C
11.82
12.00
12.18
Vdc
Output Voltage Regulation
Over Load
Io=Io, min to Io, max
±3
±15
mV
Over Line
Vin=18V to 75V
±3
±15
mV
Over Temperature
Tc=-40°C to 110°C
±120
mV
Total Output Voltage Range
Over sample load, line and temperature
11.64
12.00
12.36
V
Output Voltage Ripple and Noise
5Hz to 20MHz bandwidth
Peak-to-Peak
Full Load, 1µF ceramic, 10µF tantalum
100
mV
RMS
Full Load, 1µF ceramic, 10µF tantalum
mV
Operating Output Current Range
Vin=18V to75V
0
20
A
Operating Output Current Range
Output Over Current Protection(hiccup model)
Output Voltage 10% Low
110
140
%
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Vin=48V, 10µF Tan & 1µF Ceramic load cap,
0.1A/µs
Positive Step Change in Output Current
75% Io.max to 50% Io.max
550
mV
Negative Step Change in Output Current
50% Io.max to 75% Io.max
550
mV
Settling Time (within 1% Vout nominal)
200
µs
Turn-On Transient
Start-Up Time, From On/Off Control
35
mS
Start-Up Time, From Input
35
mS
Output Capacitance (note1)
Full load; 5% overshoot of Vout at startup
0
5000
µF
EFFICIENCY
100% Load
Vin=24V
93.5
%
100% Load
Vin=48V
93.0
%
60% Load
Vin=48V
92.0
%
ISOLATION CHARACTERISTICS
Input to Output
2250
Vdc
Isolation Resistance
10
MΩ
Isolation Capacitance
1000
pF
FEATURE CHARACTERISTICS
Switching Frequency
260
KHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
Von/off
0.8
V
Logic High (Module Off)
Von/off
2.4
5
V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Von/off
0.8
V
Logic High (Module On)
Von/off
2.4
5
V
ON/OFF Current (for both remote on/off logic)
Ion/off at Von/off=0.0V
1
mA
Leakage Current (for both remote on/off logic)
Logic High, Von/off=5V
Output Voltage Trim Range(note 2)
Pout ≦ max rated power,Io ≦ Io.max
-10
10
%
Output Voltage Remote Sense Range
Pout ≦ max rated power,Io ≦ Io.max
10
%
Output Over-Voltage Protection
Over full temp range; % of nominal Vout
115
140
%
GENERAL SPECIFICATIONS
MTBF
Io=80% of Io, max; Ta=25°C, normal input,600FLM
3.0
M hours
Weight
Without heat spreader
45.5
grams
Weight
With heat spreader
61.1
grams
Over-Temperature Shutdown ( Without heat spreader)
Refer to Figure 19 for Hot spot 1 location
(48Vin,80% Io, 200LFM,Airflow from Vin+ to Vin-)
135
°C
Over-Temperature Shutdown (With heat spreader)
Refer to Figure 22 for Hot spot 2 location
(48Vin,80% Io, 200LFM,Airflow from Vin+ to Vin-)
120
°C
Over-Temperature Shutdown ( NTC resistor )
Refer to Figure 19 for NTC resistor location
130
°C
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spots’ temperature is just for reference.
Q36SR12020NRFA_11252015
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 3: Typical full load input characteristics at room
temperature
Q36SR12020NRFA_11252015
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (resistive
load) (10 ms/div). Vin=48V. Top Trace: Vout, 3.0V/div; Bottom
Trace: ON/OFF input, 3V/div
Figure 5: Turn-on transient at zero load current (10 ms/div).
Vin=48V. Top Trace: Vout: 3.0V/div, Bottom Trace: ON/OFF
input, 3V/div
Figure 6: Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 0.1A/µs; Vin is 24v).
Load cap: 10µF tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (0.5V/div, 500us/div), Bottom Trace:Iout
(5A/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module
Figure 7: Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 0.1A/µs; Vin is 48v).
Load cap: 10µF tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (0.5V/div, 500us/div), Bottom Trace: Iout
(5A/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module
0
0
0
0
0
0
0
0
Q36SR12020NRFA_11252015
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ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Test set-up diagram showing measurement points for
Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above
Figure 9: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage (Vin=48V) with 12µH source
impedance and 33µF electrolytic capacitor (1A/div, 5us/div)
Figure 10: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage (Vin=48V) and rated
load current (20 mA/div, 5us/div)
Figure 11: Output voltage noise and ripple measurement test
setup
Figure 12: Output voltage ripple at nominal input voltage
(Vin=48V) and rated load current (50 mV/div, 2us/div).Load
capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 20 MHz. Scope measurements should be
made using a BNC cable (length shorter than 20 inches).
Position the load between 51 mm to 76 mm (2 inches to 3
inches) from the module
Figure 13: Output voltage vs. load current showing typical
current limit curves and converter shutdown points (Vin=48V)
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIVE
LOAD
0
0
0
Q36SR12020NRFA_11252015
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CAN/CSA C22.2 NO. 60950-1-07(2nd Edition) and IEC
60950-1: 2005(2nd Edition), if the system in which the
power module is to be used must meet safety agency
requirements.
Basic insulation based on 75 Vdc input is provided between
the input and output of the module for the purpose of
applying insulation requirements when the input to this
DC-to-DC converter is identified as TNV-2 or SELV. An
additional evaluation is needed if the source is other than
TNV-2 or SELV.
When the input source is SELV circuit, the power module
meets SELV (safety extra-low voltage) requirements. If the
input source is a hazardous voltage which is greater than 60
Vdc and less than or equal to 75 Vdc, for the module’s
output to meet SELV requirements, all of the following must
be met:
The input source must be insulated from the ac mains
by reinforced or double insulation.
The input terminals of the module are not operator
accessible.
A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault, hazardous
voltage does not appear at the module’s output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to the
end-use installation, as the spacing between the module
and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
This power module is not internally fused. To achieve
optimum safety and system protection, an input line fuse is
highly recommended. The safety agencies require a
Fast-acting fuse with 50A maximum rating to be installed in
the ungrounded lead. A lower rated fuse can be used
based on the maximum inrush transient energy and
maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the finished
circuit board assembly test. Adequate cleaning and/or
drying is especially important for un-encapsulated and/or
open frame type power modules. For assistance on
appropriate soldering and cleaning procedures, please
contact Delta’s technical support team.
DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the DC/DC
power modules will interact with the modules and affect the
stability. A low ac-impedance input source is recommended.
If the source inductance is more than a few μH, we advise
adding a 100 μF electrolytic capacitor (ESR < 0.7 Ω at 100
kHz) mounted close to the input of the module to improve
the stability.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate in a
wide variety of systems and applications. For design
assistance with EMC compliance and related PWB layout
issues, please contact Delta’s technical support team. An
external input filter module is available for easier EMC
compliance design. Below is the reference design for an
input filter tested with Q36SR12020 to meet class A in
CISSPR 22.
Schematic
Test result:
25C, 48Vin, full load, Green line is quasi peak mode and
blue line is average mode.
Safety Considerations
The power module must be installed in compliance with the
spacing and separation requirements of the end-user’s
safety agency standard, i.e., UL60950-1(2nd Edition),
Q36SR12020NRFA_11252015
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FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current
protection circuit, which will endure current limiting for an
unlimited duration during output overload. If the output
current exceeds the OCP set point, the modules will
automatically shut down, and enter hiccup mode.
For hiccup mode, the module will try to restart after
shutdown. If the over current condition still exists, the
module will shut down again. This restart trial will continue
until the over-current condition is corrected.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the output
terminals. If this voltage exceeds the over-voltage set point,
the module will shut down, and enter in hiccup.
For hiccup mode, the module will try to restart after
shutdown. If the over voltage condition still exists, the
module will shut down again. This restart trial will continue
until the over-voltage condition is corrected.
Over-Temperature Protection
The over-temperature protection consists of circuitry that
provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold the
module will shut down, and enter in hiccup.
For hiccup mode, the module will try to restart after
shutdown. This restart trial will continue until the
over-temperature condition is corrected.
Remote On/Off
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi(-) terminal. The
switch can be an open collector or open drain.
For negative logic if the remote on/off feature is not
used, please short the on/off pin to Vi(-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin floating.
Vo(+)
Sense(+)
Vo(-)
trim
Vi(+)
Vi(-)
ON/OFF Rload
Sense(-)
Figure 14: Remote on/off implementation
Remote Sense
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point
of load. The voltage between the remote sense pins
and the output terminals must not exceed the output
voltage sense range given here:
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% ×
Vout
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
Vo(+)
Sense(+)
Vo(-)
trim
Vi(+)
Vi(-)
ON/OFF Rload
Sense(-)
Conduct resistance
Figure 15: Effective circuit configuration for remote sense
operation
Q36SR12020NRFA_11252015
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FEATURES DESCRIPTIONS (CON.)
If the remote sense feature is not used to regulate the output
at the point of load, please connect SENSE(+) to Vo(+) and
SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the remote
sense and the trim; however, the maximum increase is the
larger of either the remote sense or the trim, not the sum of
both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin and
the SENSE(+) or SENSE(-). The TRIM pin should be
left open if this feature is not used.
Figure 16: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases. The external resistor value required to
obtain a percentage of output voltage change △% is
defined as:
KdownRtrim 2.10
511
Ex. When Trim-down -10% (12V×0.9=10.8V)
KKdownRtrim 9.402.10
10
511
Figure 17: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases.
The external resistor value required to obtain a
percentage output voltage change △% is defined as:
KupRtrim 2.10
511
1.225 ) (100 Vo11.5
Ex. When Trim-up +10% (12V×1.1=13.2V)
KupRtrim 3.4892.10
10
511
10225.1 )10100(1211.5
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is
the larger of either the remote sense or the trim, not the
sum of both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Q36SR12020NRFA_11252015
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THERMAL CONSIDERATIONS
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Delta’s DC/DC power modules are characterized in
heated vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
The following figure shows the wind tunnel
characterization setup. The power module is mounted
on a 185mmX185mm,70μm (2Oz),6 layers test PWB
and is vertically positioned within the wind tunnel. The
space between the neighboring PWB and the top of the
power module is constantly kept at 6.35mm (0.25’’).
AIR FLOW
MODULE
PWB
50.8(2.00")
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
FANCING PWB
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 18: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the
module. To enhance system reliability, the power
module should always be operated below the maximum
operating temperature. If the temperature exceeds the
maximum module temperature, reliability of the unit may
be affected.
Q36SR12020NRFA_11252015
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THERMAL CURVES
(WITH HEAT SPREADER)
HOT SPOT 2
AIRFLOW
Figure 22: Temperature measurement location.*
The allowed maximum hot spot2 temperature is defined at 100
℃
0
40
80
120
160
200
240
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Power(W)
Ambient Temperature (℃)
Q36SR12020(Standard) Output Power vs. Ambient Temperature and Air Velocity
@Vin = 24V (Transverse Orientation,with Heat Spreader)
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
Figure 23: Output current vs. ambient temperature and air velocity
@Vin=24V(Transverse Orientation, Airflow direction from Vin+ to
Vin-,with heat spreader)
0
40
80
120
160
200
240
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Power(W)
Ambient Temperature (℃)
Q36SR12020(Standard) Output Power vs. Ambient Temperature and Air Velocity
@Vin = 48V (Transverse Orientation,with Heat Spreader)
Natural
Convection
100LFM 200LFM
300LFM
400LFM
600LFM
500LFM
Figure 24: Output current vs. ambient temperature and air velocity
@Vin=48V(Transverse Orientation, Airflow direction from Vin+ to
Vin-,with heat spreader)
THERMAL CURVES
(WITHOUT HEAT SPREADER)
HOT SPOT 1
AIRFLOW
NTC RESISTOR
Figure 19: Temperature measurement location.*
The allowed maximum hot spot1 temperature is defined at
120
℃
0
40
80
120
160
200
240
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Power(W)
Ambient Temperature (℃)
Q36SR12020(Standard) Output Power vs. Ambient Temperature and Air Velocity
@Vin = 24V (Transverse Orientation)
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
Figure 20: Output current vs. ambient temperature and air
velocity @Vin=24V(Transverse Orientation, Airflow direction
from Vin+ to Vin-,without heat spreader)
0
40
80
120
160
200
240
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Power(W)
Ambient Temperature (℃)
Q36SR12020(Standard) Output Power vs. Ambient Temperature and Air Velocity
@Vin = 48V (Transverse Orientation)
Natural
Convection
100LFM
200LFM
300LFM
400LFM
600LFM
500LFM
Figure 21: Output current vs. ambient temperature and air
velocity @Vin=48V(Transverse Orientation, Airflow direction
from Vin+ to Vin-,without heat spreader)
Q36SR12020NRFA_11252015
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*
MECHANICAL DRAWING (WITH HEAT-SPREADER)
For modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly
onto system boards; please do not subject such modules through reflow temperature profile.
Q36SR12020NRFA_11252015
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MECHANICAL DRAWING (WITHOUT HEAT-SPREADER)
Pin No.
Name
Function
1
2
3
4
5
6
7
8
+Vin
ON/OFF
-Vin
-Vout
-Sense
Trim
+Sense
+Vout
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
Pin Specification:
Pins 1-3,5-7
1.00mm (0.040”) diameter
Pins 4 & 8
2. 1.50mm (0.060”) diameter
Note：All pins are copper alloy with matte tin(Pb free) plated over Ni under-plating.
Q36SR12020NRFA_11252015
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RECOMMENDED PAD LAYOUT(THROUGH-HOLE MODULE)
Q36SR12020NRFA_11252015
14
PART NUMBERING SYSTEM
Q
36
S
R
120
20
N
R
F
A
Type of
Product
Input
Voltage
Number of
Outputs
Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length/Type
Option Code
Q - 1/4
Brick
36 -
18V~75V
S - Single
R - Regular
120 - 12V
20- 20A
N- Negative
P- Positive
R - 0.170”
N - 0.146”
K - 0.110”
Space - RoHS 5/6
F - RoHS 6/6
(Lead Free)
A – Standard
Functions
H-with heat spreader
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
Q36SR12020NRFA
18V~75V
17.2A
12V
20A
93.0% @ 48Vin
Default remote on/off logic is negative and pin length is 0.170”
* For modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly
on to system boards; please do not subject such modules through reflow temperature profile.
CONTACT: www.deltaww.com/dcdc Email: dcdc@deltaww.com
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Europe:
Phone: +31-20-655-0967
Fax: +31-20-655-0999
Asia & the rest of world:
Telephone: +886 3 4526107
Ext 6220~6224
Fax: +886 3 4513485
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon
request from Delta.
Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its
use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications
at any time, without notice.
