T
Technical
echnical
S
Specification
pecification
PQ60012EGL25
PQ60012EGL25
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 1
TThhee PPQQ6600001122EEGGLL2255 PPoowweerrQQoorr™™GGiiggaa eeiigghhtthh-bbrriicckk ccoonn-
vveerrtteerr iiss aa nneexxtt-ggeenneerraattiioonn,, bbooaarrdd-mmoouunnttaabbllee,, iissoollaatteedd,, ffiixxeedd
sswwiittcchhiinngg ffrreeqquueennccyy DDCC//DDCC ccoonnvveerrtteerr tthhaatt uusseess ssyynncchhrroo-
nnoouuss rreeccttiiffiiccaattiioonn ttoo aacchhiieevvee eexxttrreemmeellyy hhiigghh ccoonnvveerrssiioonn eeffffii-
cciieennccyy.. TThhee ppoowweerr ddiissssiippaatteedd bbyy tthhee ccoonnvveerrtteerr iiss ssoo llooww tthhaatt
aa hheeaattssiinnkk iiss nnoott rreeqquuiirreedd,, wwhhiicchh ssaavveess ccoosstt,, wweeiigghhtt,, hheeiigghhtt,,
aanndd aapppplliiccaattiioonn eeffffoorrtt.. AAllll ooff tthhee ppoowweerr aanndd ccoonnttrrooll ccoomm-
ppoonneennttss aarree mmoouunntteedd ttoo tthhee mmuullttii-llaayyeerr PPCCBB ssuubbssttrraattee wwiitthh
hhiigghh-yyiieelldd ssuurrffaaccee mmoouunntt tteecchhnnoollooggyy.. SSiinnccee tthhee PPoowweerrQQoorr
ccoonnvveerrtteerr hhaass nnoo eexxpplliicciitt tthheerrmmaall iinntteerrffaacceess,, iitt iiss eexxttrreemmeellyy
rreelliiaabbllee..
PQ60012EGL25 Module
48V
48Vin
in 1.2V
1.2Vout
out 25Amp
25Amp 2000Vdc
2000Vdc Eighth-brick
Eighth-brick
Input
Input Output
Output Current
Current Isolation
Isolation DC/DC Conver
DC/DC Converter
ter
• High efficiency, 81% at full load, >84% half load
• Delivers up to 25 amps of output current with minimal
derating - no heatsink required
• Wide input voltage range: 35V – 75V, with 100V
100ms input voltage transient capability
• Fixed frequency switching provides predictable EMI
performance
• No minimum load requirement means no preload
resistors required
Operational Features
Operational Features
• Input under-voltage lockout disables converter at low
input voltage conditions
• Output current limit and short circuit protection protects
converter and load from permanent damage and conse-
quent hazardous conditions
• Active back bias limit prevents damage to converter
from external load induced pre-bias
• Output over-voltage protection protects load from dam-
aging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
Pr
Protection Features
otection Features
• 2000V, 30 MΩinput-to-output isolation provides
input/output ground separation
• UL 1950 recognized (US & Canada), basic insulation
rating
• TUV certified to EN60950
• Meets 72/23/EEC and 93/68/EEC directives which
facilitates CE Marking in user’s end product
• Board and plastic components meet UL94V-0 flammabil-
ity requirements
Safety Features
Safety Features
• Industry standard eighth-brick pin-out configuration
• Industry standard size: 0.90” x 2.3” (22.9x58.4mm)
• Total height only 0.335” (8.5mm), permits better airflow
and smaller card pitch
• Total weight: 0.68 oz. (19 grams)
• Flanged pins designed to permit surface mount solder-
ing (avoid wave solder) using FPiP technique
Mechanical Features
Mechanical Features
• On/Off control referenced to input side (positive and
negative logic options are available)
• Remote sense for the output voltage compensates for
output distribution drops
• Output voltage trim permits custom voltages and voltage
margining
Contr
Control Features
ol Features
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 2
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
Pin No. Name Function
1 Vin(+) Positive input voltage
2 ON/OFF TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
3 Vin(-) Negative input voltage
4 Vout(-) Negative output voltage
5 SENSE(-) Negative remote sense1
6 TRIM Output voltage trim2
7 SENSE(+) Positive remote sense3
8 Vout(+) Positive output voltage
Notes:
1. SENSE(-) may be connected to Vout(-) or left open.
2. Leave TRIM pin open for nominal output voltage.
3. SENSE(+) may be connected to Vout(+) or left open.
NOTES
1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter. with 0.080”
(2.03mm) diameter standoff shoulders.
2) Pins 4 and 8 are 0.062” (1.57 mm) diameter with 0.100”
(2.54 mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
5) Undimensioned components are shown for visual reference
only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 0.68 oz. (19 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) Modules can be ordered as EGA option that have different
pins to provide a minimum bottom side clearance of 0.076”
while increasing maximum height to 0.424”. See ordering
page for more information.
10) The flanged pins are designed to permit surface mount
soldeing (avoiding the wave soldering process) through
the use of the flanged pin-in-paste technique.
0.300
(7.62)
0.600
(15.24)
0.90
(22.86)
0.150
(3.81) 0.150
(3.81)
0.300
(7.62) 0.450
(11.43) 0.600
(15.24)
0.14
(3.56)
2.30
(58.42)
2.00
(50.8)
Top View
PIN DESIGNATIONS
MECHANICAL
DIAGRAM
Flanged Pin
See Note 10
Side View
Load Board
Bottom side
Clearance
See Note 9
Lowest
Component
0.110
(2.79)
See Note 3
0.019 +0.013
(0.48 +0.33)
0.335
(8.5)
EGA Option
0.424 (10.76)
max height
See Note 9
EGA Option
0.076 (1.93)
min clearance
See Note 9
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 3
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
Parameter
Min. Typ. Max. Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating 100 V continuous
Operating 80 V continuous
Operating Transient Protection
100 V
100
ms transient, square wave
Isolation Voltage (input to output) 2000 V Basic insulation, Pollution Degree 2
Operating Temperature -40 100
°C
Storage Temperature -55 125
°C
Voltage at ON/OFF input pin -2 18 V
INPUT CHARACTERISTICS
Operating Input Voltage Range 35 48 75 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 31.5 33.3 34.4 V
Turn-Off Voltage Threshold 29.5 31.0 32.4 V
Lockout Voltage Hysteresis 2.2 2.3 2.4 V
Maximum Input Current 0.9 A 100% Load, 35 Vin
No-Load Input Current 25 mA
Disabled Input Current 2 5 mA
Inrush Current Transient Rating 0.01 A2s
Response to Input Transient 50 mV 1000V/ms input transient
Input Reflected Ripple Current 3.0 mA RMS thru 10
µH inductor; Figures 13 & 15
Input Terminal Ripple Current 165 mA RMS
; Figures 13 & 14
Recommended Input Fuse 10 A fast blow external fuse recommended
Input Filter Component Values (L\C) 4.7\1.0
µH\µF internal values, see Figure E
Recommended External Input Capacitance 47
µF Typical ESR 0.1-0.2
Ω
, see Figure 13
OUTPUT CHARACTERISTICS
Output Voltage Set Point 1.188 1.20 1.212 V
Output Voltage Regulation
Over Line +0.05 \ 2 +0.1 \ 5 %\mV
Over Load +0.1 \ 2 +0.2 \ 5 %\mV
Over Temperature +6+20 mV
Total Output Voltage Range 1.155 1.245 V over sample, line, load, temperature & life
Output Voltage Ripple and Noise120MHz bandwidth; Figures 13 & 16
Peak-to-Peak 85 130 mV Full Load, see Figures 13 & 16
RMS 20 30 mV Full Load, see Figures 13 & 16
Operating Output Current Range 0 25 A Subject to thermal derating; Figures 5-8
Output DC Current-Limit Inception 28.5 A Output Voltage 10% Low; Figure 17
Output DC Current-Limit Shutdown Voltage 0.6 V
Back-Drive Current Limit while Enabled 0.45 A Negative current drawn from output
Back-Drive Current Limit while Disabled 10 50 mA Negative current drawn from output
Maximum Output Capacitance 45,000
µF
1.2Vout at 25A Resistive Load
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection 80 dB 120 Hz; Figure 20
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs) 60 mV 50% to 75% to 50% Iout max; Figure 11
For a Step Change in Output Current (5A/µs) 100 mV 50% to 75% to 50% Iout max; Figure 12
Settling Time 600 µs to within 1% Vout nom
Turn-On Transient
Turn-On Time 14 18 ms Full load, Vout=90% nom.; Figures 9 & 10
Start-Up Inhibit Time 180 200 240 ms
-40°C to +125°C; Figure F
Output Voltage Overshoot 0 % 45,000 µF load capacitance, Iout = 0A
EFFICIENCY
100% Load 81 % Figures 1 - 4
50% Load 84.5 % Figures 1 - 4
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature 125 °C Package rated to 150°C
Board Temperature 125 °C UL rated max operating temp 130°C
Transformer Temperature 125 °C See Figures 5 - 8 for derating curves
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength) 2000 V
Isolation Resistance 30 M
Ω
Isolation Capacitance
2
470 pF
PQ60012EGL25 ELECTRICAL CHARACTERISTICS
T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient tem-
perature with appropriate power derating.
Specifications subject to change without notice.
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 2: Higher values of isolation capacitance can be added external to the module.
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 4
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
Parameter
PMin. Typ. Max. Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency 195 225 255 kHz Regulation and Isolation stages
ON/OFF Control (Option P)
Off-State Voltage -2 0.8 V
On-State Voltage 2.4 18 V
ON/OFF Control (Option N)
Off-State Voltage 2.4 18 V
On-State Voltage -2 0.8 V
ON/OFF Control (Either Option) Figures A, B
Pull-Up Voltage Vin/6 15 V
Pull-Up Resistance 40 k
Ω
Output Voltage Trim Range -20 +10 % Measured across Pins 8 & 4; Figure C
Output Voltage Remote Sense Range +10 % Measured across Pins 8 & 4
Output Over-Voltage Protection 120 125 130 % Over full temp range; % of nominal Vout
Over-Temperature Shutdown 125 °C Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis 10 °C
Load Current Scale Factor 500 See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) 2.5 106Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
Calculated MTBF (MIL-217) 1.1 106Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
Field Demonstrated MTBF 106Hrs. See website for latest values
STANDARDS COMPLIANCE
Parameter
PNotes
STANDARDS COMPLIANCE
UL/cUL 60950 File # E194341, Basic insulation & pollution degree 2
EN60950 Certified by TUV
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2) test on entire assembly; board & plastic components UL94V-0 compliant
IEC 61000-4-2 ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
GR-1089-CORE Section 7 - electrical safety, Section 9 - bonding/grounding
Telcordia (Bellcore) GR-513
•
An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety
certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter
P# Units Test Conditions
QUALIFICATION TESTING
Life Test 32 95% rated Vin and load, units at derating point, 1000 hours
Vibration 5 10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis
Temperature Cycling 10 -40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Power/Thermal Cycling 5 Toperating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality 5 Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
Humidity 5 85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
Solderability 15 pins MIL-STD-883, method 2003
•
Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact factory for official product family qualification document.
ELECTRICAL CHARACTERISTICS (Continued)
OPTIONS
SynQor provides various options for Enable Logic and Pin Length
for this family of DC/DC converters. Please consult the last page
of this specification sheet for information on available options.
PATENTS
SynQor is protected under various patents, including but not lim-
ited to U.S. Patent numbers 5,999,417; 6,222,742 B1;
6,594,159 B2; 6,545,890 B2.
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 5
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
60
65
70
75
80
85
90
95
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
Load Current (A)
Efficiency (%)
35 Vin
48 Vin
75 Vin
Figure 1: Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
80
81
82
83
84
85
86
87
88
0 100 200 300 400 500
Air Flow (LFM)
Efficiency (%)
25 C
40 C
55 C
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and 55
°
C
(nominal input voltage).
0
1
2
3
4
5
6
7
8
0 3 5 8 10 13 15 18 20 23 25
Load Current (A)
Power Dissipation (W)
35 Vin
48 Vin
75 Vin
Figure 3: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
0.0
1.0
2.0
3.0
4.0
5.0
0 100 200 300 400 500
Air Flow (LFM)
Power Dissipation (W)
25 C
40 C
55 C
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and
55
°
C (nominal input voltage).
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0 2540557085
Ambient Air Temperature (oC)
Iout (A)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
50 LFM (0.25 m/s)
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
across the converter from pin 3 to pin 1 (nominal input voltage).
Figure 6: Thermal plot of converter at 25 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
sideways from pin 3 to pin 1 (nominal input voltage).
Semiconductor junction temperature is
within 1
°
C of surface temperature
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 6
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0 2540557085
Ambient Air Temperature (oC)
Iout (A)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
50 LFM (0.25 m/s)
Figure 7: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 25 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (4 ms/div).
Input voltage pre-applied. Ch 1: Vout (500mV/div). Ch 2: ON/OFF
input (5V/div)
Figure 10: Turn-on transient at zero load (4 ms/div). Ch 1: Vout
(500mV/div). Ch 2: ON/OFF input (5V/div).
Figure 11: Output voltage response to step-change in load current (50%-
75%-50% of Iout(max); dI/dt = 0.1A/
µ
s). Load cap: 10
µ
F, 100 m
Ω
ESR tanta-
lum cap and 1
µ
F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
Figure 12: Output voltage response to step-change in load current (50%-
75%-50% of Iout(max): dI/dt = 5A/
µ
s). Load cap: 470
µ
F, 30 m
Ω
ESR tanta-
lum cap and 1
µ
F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
Semiconductor junction temperature
is within 1
°
C of surface temperature
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 7
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
Figure 13: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 14), Input Reflected Ripple Current
(Figure 15) and Output Voltage Ripple (Figure 16).
10
µ
H
source
impedance
DC/DC
Converter
See Fig. 15
See Fig. 14
See Fig. 16
1
µ
F
ceramic
capacitor
10
µ
F,
100m
Ω
ESR
tantalum
capacitor
47
µ
F,
<1
Ω
ESR
electrolytic
capacitor
VSOURCE
iSiCVOUT
Figure 14: Input Terminal Ripple Current, ic, at full rated output cur-
rent and nominal input voltage with 10
µ
H source impedance and 47
µ
F
electrolytic capacitor (200 mA/div). See Figure 13.
Figure 15: Input Reflected Ripple Current, is, through a 10
µ
H source
inductor at nominal input voltage and rated load current (5 mA/div).
See Figure 13.
Figure 16: Output Voltage Ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1
µ
F ceramic capacitor
and 10
µ
F tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
0.0
0.5
1.0
1.5
2.0
0 5 10 15 20 25 30
Load Current (A)
Output Voltage (V)
35 V
48 V
75 V
Figure 17: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Figure 18: Load current (20A/div) as a function of time when the con-
verter attempts to turn on into a 10 m
Ω
short circuit. Top trace
(2.0ms/div) is an expansion of the on-time portion of the bottom trace.
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 8
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
0.0001
0.001
0.01
0.1
10 100 1,000 10,000 100,000
Hz
Output Impedance (
ΩΩ
)
35 Vin
48 Vin
75 Vin
Figure 19: Magnitude of incremental output impedance (Zout =
vout/iout) for minimum, nominal, and maximum input voltage at full
rated power.
-110
-100
-90
-80
-70
-60
-50
-40
-30
10 100 1,000 10,000 100,000
Hz
Forward Transmission (dB)
35 Vin
48 Vin
75 Vin
Figure 20: Magnitude of incremental forward transmission (FT =
vout/vin) for minimum, nominal, and maximum input voltage at full
rated power.
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000
Hz
Reverse Transmission (dB)
35 Vin
48 Vin
75 Vin
Figure 21: Magnitude of incremental reverse transmission (RT =
iin/iout) for minimum, nominal, and maximum input voltage at full rated
power.
0.1
1
10
100
1000
10 100 1,000 10,000 100,000
Hz
Input Impedance (
ΩΩ
)
35 Vin
48 Vin
75 Vin
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input
voltage at full rated power.
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 9
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
BASIC OPERATION AND FEATURES
The
Power
Qor series converter uses a two-stage power conver-
sion topology. The first stage is a buck-converter that keeps the
output voltage constant over variations in line, load, and temper-
ature. The second stage uses a transformer to provide the func-
tions of input/output isolation and voltage step-down to achieve
the low output voltage required.
Both the first stage and the second stage switch at a fixed fre-
quency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous rectifiers.
These devices, which are MOSFETs with a very low on-state resis-
tance, dissipate far less energy than Schottky diodes. This is the
primary reason that the
Power
Qor converter has such high effi-
ciency, even at very low output voltages and very high output cur-
rents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not required,
the
Power
Qor converter does not need a metal baseplate or pot-
ting material to help conduct the dissipated energy to the
heatsink. The
Power
Qor converter can thus be built more simply
and reliably using high yield surface mount techniques on a PCB
substrate.
The
Power
Qor series of eighth-brick, quarter-brick and half-brick
converters uses the industry standard footprint and pin-out con-
figuration.
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is
on
or
off
. This input is
referenced to the return terminal of the input bus, Vin(-). There
are two versions of the converter that differ by the sense of the
logic used for the ON/OFF input.
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter
on
). In the negative logic
version, the ON/OFF signal is active low (meaning that a low
turns the converter
on
). Figure A details five possible circuits for
driving the ON/OFF pin. Figure B is a detailed look of the inter-
nal ON/OFF circuitry.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs cor-
rect for voltage drops along the conductors that connect the con-
verter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 should be con-
nected to Vout(-) at the point on the board where regulation is
desired. A remote connection at the load can adjust for a voltage
drop only as large as that specified in this datasheet, that is
[Vout(+) - Vout(-)]– [Vsense(+) - Vsense(-)]<
Sense Range % x Vout
Pins 7 and 5 must be connected for proper regulation of the out-
put voltage. If these connections are not made, the converter will
deliver an output voltage that is slightly lower than its specified
value.
Note: the output over-voltage protection circuit senses the voltage
Open Collector Enable Circuit
Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
ON/OFF
Vin(_)
ON/OFF
ON/OFF
Vin(_)
ON/OFF
5V
TTL/
CMOS
Vin(_)
ON/OFF
Vin(_)
Vin(_)
TTL
5V
50k
274k
Vin(+)
ON/OFF
Vin(_)
50k
100pF
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 10
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
across the output (pins 8 and 4) to determine when it should trig-
ger, not the voltage across the converter’s sense leads (pins 7
and 5). Therefore, the resistive drop on the board should be
small enough so that output OVP does not trigger, even during
load transients.
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications.
To decrease the output voltage, the user should connect a resistor
between Pin 6 and Pin 5 (SENSE(-) input). To increase the output
voltage, the user should connect a resistor between Pin 6 and Pin
7 (SENSE(+) input). For a desired change of the nominal output
voltage, the value of the resistor should be
Figure C graphs the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
Figure C: Trim Graph for 1.2Vout module
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection cir-
cuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally bypassed to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout,
due to both trimming and remote load voltage drops, should not
be greater than that specified for the output voltage trim range.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to
turn off when the input voltage is too low, helping avoid an input
system instability problem, described in more detail in the appli-
cation note titled “Input System Instability”. The lockout circuitry
is a comparator with DC hysteresis. When the input voltage is ris-
ing, it must exceed the typical Turn-On Voltage Threshold value
(listed on the specification page) before the converter will turn
on. Once the converter is on, the input voltage must fall below
the typical Turn-Off Voltage Threshold value before the converter
will turn off.
Output Current Limit: The maximum current limit remains con-
stant as the output voltage drops. However, once the impedance
of the short across the output is small enough to make the output
voltage drop below the specified Output DC Current-Limit
Shutdown Voltage, the converter turns off.
The converter then enters a “hiccup mode” where it repeatedly
turns on and off at a 5 Hz (nominal) frequency with a 5% duty
cycle until the short circuit condition is removed. This prevents
excessive heating of the converter or the load board.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the Output Over-Voltage Protection threshold, the
converter will immediately stop switching. This prevents damage
to the load circuit due to 1) excessive series resistance in output
current path from converter output pins to sense point, 2) a
release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions. After
200 ms the converter will automatically restart.
Over-Temperature Shutdown: A temperature sensor on the
converter senses the average temperature of the module. The
thermal shutdown circuit is designed to turn the converter off
when the temperature at the sensed location reaches the Over-
Temperature Shutdown value. It will allow the converter to turn on
again when the temperature of the sensed location falls by the
amount of the Over-Temperature Shutdown Restart Hysteresis
1
10
100
0.96 1.00 1.04 1.08 1.12 1.16 1.20 1.24 1.28 1.32
Desired Output Voltage
Trim Resistance (kOhms)
Rtrim = VNOM
-
VDES
-1
VDES
where VNOM = Nominal Voltage
VDES = Desired Voltage
(Vertical bars indicate
absolute value)
(k
Ω)
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 11
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
value.
APPLICATION CONSIDERATIONS
Input System Instability: This
condition can occur because
any DC/DC converter appears incrementally as a negative
resistance load. A detailed application note titled “Input
System Instability” is available on the SynQor web site
(www.synqor.com) which provides an understanding of why
this instability arises, and shows the preferred solution for cor-
recting it.
Application Circuits: Figure D below provides a typical cir-
cuit diagram which details the input filtering and voltage trim-
ming.
Input Filtering and External Capacitance: Figure E below
provides a diagram showing the internal input filter components.
This filter dramatically reduces input terminal ripple current,
which otherwise could exceed the rating of an external elec-
trolytic input capacitor. The recommended external input capac-
itance is specified in the “Input Characterisitcs” section. More
detailed information is available in the application note titled
“EMI Characteristics” on the SynQor website.
Vin External
Input
Filter
Trim
Vin(+)
Iload
Cload
L
C
Vout(+)
Rtrim-up
or
Rtrim-down
Vsense(+)
ON/OFF
Vin(_)
Vin(+)
Vin(_)
Vout(_)
Vsense(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Figure E: Internal Input Filter Diagram (component values listed on page 3).
Electrolytic
Capacitor
47µF
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 12
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shut down for any reason. When an output short is present, this
generates a 5Hz "hiccup mode," which prevents the converter
from overheating. In all, there are seven ways that the converter
can be shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Eighth-brick)
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
• Short Circuit Protection
• Turned off by the ON/OFF input
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, when the input voltage is below the UVL threshold,
the unit is disabled by the Input Under-Voltage Lockout feature.
When the input voltage rises above the UVL threshold, the Input
Under-Voltage Lockout is released, and a Startup Inhibit Period is
initiated. At the end of this delay, the ON/OFF pin is evaluated,
and since it is active, the unit turns on.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
Figure F: Startup Inhibit Period (turn-on time not to scale)
Vout
Vin
200ms 200ms
200ms
(typical start-up
inhibit period)
t0t1t2t
ON ON ON
OFF OFF
9ms (typical
turn on time)
Product # PQ60012EGL25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2EG621D Rev. B 10/18/04 Page 13
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
1.2 V
1.2 V
25 A
25 A
Eighth-brick
Eighth-brick
T
Technical S
echnical Specification
pecification
PART NUMBERING SYSTEM
The part numbering system for SynQor’s
Power
Qor DC/DC
converters follows the format shown in the example below.
The first 12 characters comprise the base part number and the
last 3 characters indicate available options. Although there
are no default values for enable logic and pin length, the most
common options are negative logic and 0.145” pins. These
part numbers are more likely to be readily available in stock
for evaluation and prototype quantities.
ORDERING INFORMATION
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
Modules above can be ordered to have an increased bottom
side board clearance and a slightly larger total height (see
page 2 for dimensions). To order these parts, replace EGL in
part number with EGA. There are no other differences from
the EGL units.
The following option choices must be included in place of the
x y z
spaces in the model numbers listed above.
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our web site or is available upon request from
SynQor.
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor 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 SynQor.
Contact SynQor for further information:
Phone: 978-849-0600
Toll Free: 888-567-9596
Fax: 978-849-0602
E-mail: sales@synqor.com
Web: www.synqor.com
Address: 155 Swanson Road
Boxborough, MA 01719
Application Notes
A variety of application notes and technical white papers
can be downloaded in pdf format at www.synqor.com.
Output Max Output
Voltage Current
PQ60010EGL20xyz 35 - 75 V 1.0 V 20 A
PQ60010EGL25xyz 35 - 75 V 1.0 V 25 A
PQ60012EGL20xyz 35 - 75 V 1.2 V 20 A
PQ60012EGL25xyz 35 - 75 V 1.2 V 25 A
PQ60015EGL20xyz 35 - 75 V 1.5 V 20 A
PQ60015EGL25xyz 35 - 75 V 1.5 V 25 A
PQ60018EGL20xyz 35 - 75 V 1.8 V 20 A
PQ60018EGL25xyz 35 - 75 V 1.8 V 25 A
PQ60025EGL20xyz 35 - 75 V 2.5 V 20 A
PQ60025EGL25xyz 35 - 75 V 2.5 V 25 A
PQ60033EGL20xyz 35 - 75 V 3.3 V 20 A
PQ60050EGL15xyz 35 - 75 V 5.0 V 15 A
Model Number
Input Voltage
Enable Pin Feature
Logic Length Set
P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
Options Description: x y z
PQ 60 012 EG L 25 N N S
Product Family
Package Size
Performance Level
Thermal Design
Output Current
Options (see
Ordering Information)
Input Voltage
Output Voltage
