Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/05 Page 1
T
Technical
echnical
S
Specification
pecification
PQ60525HT
PQ60525HTA04
A04
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PQ60525HTA04 Module
48V
48Vin
in 52.5V
52.5Vout
out 200W
200W 2250Vdc
2250Vdc Half-brick
Half-brick
Input
Input Output
Output Power
Power Isolation
Isolation DC/DC Conver
DC/DC Converter
ter
• Ultra-high efficiency, 92% at full rated load current
• Delivers up to 200 Watts of output power with mini-
mal derating - no heatsink required
• Wide input voltage range: 35V – 75V, with 100V
100ms input voltage transient capability
• Fixed frequency switching provides predictable EMI
performance
Operational Features
Operational Features
• Input under-voltage lockout disables converter at low
input voltage conditions
• Output current limit and short circuit protection
• Active back bias limit prevents damage to converter
from external load induced pre-bias
• Output over-voltage protection
• Thermal shutdown
Pr
Protection Features
otection 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
• Active current share for N+1 and parallel applications
• External Clock Synchronization pin for better EMI char-
acteristics
• Startup Synchronization pin for more consistent start-up
sequence
• ORing FET drive supply for efficient ORing protection
Optional Features
Optional Features (full-feature)
(full-feature)
• 2250V, 30 MΩinput-to-output isolation
• UL/cUL 60950 recognized (US & Canada), basic insu-
lation rating
• TUV certified to EN60950
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Safety Features
Safety Features
• Industry standard half-brick pin-out configuration
• Industry standard size: 2.3” x 2.4” (58.4 x 61.0mm)
• Total height only 0.43” (11.2mm), permits better air-
flow and smaller card pitch
• Total weight: 2.6 oz. (75 grams)
Mechanical Features
Mechanical Features
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
0.19
(4.8)
1.90
(48.3)
2.30
(58.4)
0.50
(12.7)
0.400
(10.16)
0.600
(15.24)
0.800
(20.32)
Load Board
Bottom side
Clearance
See Note 10
Lowest
Component
1.400
(35.56)
1.000
(25.40)
2.40
(61.0)
0.400
(10.16)
1.000
(25.40)
1.400
(35.56)
0.700
(17.78)
0.43
(11.2)
0.037+/-0.029
(0.94+/-0.74)
15 character “8” alternate bottom side clear-
ance option (See ordering options on Pge 14)
0.060+/-0.030
(1.52+/-0.76)
Top View
Side View
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 I share Single wire parallel signal
4 Vin(-) Negative input voltage
5 Vout(-) Negative output voltage
6 SENSE(-) Return remote sense
7 TRIM Output voltage trim
8 SENSE(+) Positive remote sense
9 Vout(+) Positive output voltage
A Clock Sync Clock synchronization
B Start Sync Startup synchronization
Pins in Italics Shaded text are optional
0.145
(3.68)
See Note 4
NOTES
1) Pins 1-4, 6-8, A-C are 0.040” (1.02mm) diameter. with
0.080” (2.03mm) diameter standoff shoulders.
2) Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125”
(3.18mm) diameter standoff shoulders.
3) Pins 3, A, B & C only included in Full-Feature models.
4) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
5) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
6) Undimensioned components are shown for visual reference
only.
7) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
8) Weight: 2.6 oz. (75g) typical
9) Workmanship: Meets or exceeds IPC-A-610C Class II
10)
UL/TUV standards require a clearance greater than 0.04”
(1.02mm) between input and output for Basic insulation. This issue
should be considered if any copper traces are on the top side of
the user’s board. Note that the ferrite cores are considered part of
the input/primary circuit.
11)
The flanged pins are designed to permit surface mount
soldering (avoiding the wave soldering process) through
the use of the flanged pin-in-paste technique.
PIN DESIGNATIONS
MECHANICAL
DIAGRAM
15 character “8” alternate bottom side clearance
option (See ordering options on Pge 14)
0.475(12.06) maximum height
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 2
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 3
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-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) 2250 V Basic insulation level, Pollution degree 2
Operating Temperature -40 100
°C
Storage Temperature -55 125
°C
Voltage at ON/OFF input pin -2 18 V
Voltage at Clock Sync pin -15 18 V applies to Full Feature option only
INPUT CHARACTERISTICS
Operating Input Voltage Range 35 48 75 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 30.6 32.5 34.4 V
Turn-Off Voltage Threshold 28.6 30.5 32.4 V
Lockout Voltage Hysteresis 1.9 2.0 2.1 V
Maximum Input Current 7.0 A 100% Load, 35 Vin, trim up 10%
No-Load Input Current 90 110 mA
Disabled Input Current 2 5 mA
Inrush Current Transient Rating 0.01 A2s
Response to Input Transient 500 mV 1000V/ms input trans;
330µF cap; Figure 17
Input Reflected Ripple Current 3 mA RMS thru 10
µH inductor; Figures 13 & 15
Input Terminal Ripple Current 150 mA RMS
; Figures 13 & 14
Recommended Input Fuse 20 A fast blow external fuse recommended
Input Filter Component Values (L\C) 1\11
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 52.00 52.50 53.00 V
Output Voltage Regulation
Over Line +0.05 \ 20 +0.1 \ 50 %\mV
Over Load +0.1 \ 40 +0.15 \ 75 %\mV
Over Temperature +150 +300 mV
Total Output Voltage Range 51.5 53.5 V over sample, line, load, temperature & life
Output Voltage Ripple and Noise120MHz bandwidth; Figures 13 & 16
Peak-to-Peak 100 150 mV Full Load, see Figures 13 & 16
RMS 20 50 mV Full Load, see Figures 13 & 16
Operating Output Current Range 0.385 3.85 A Subject to thermal derating; Figures 5-8
Output DC Current-Limit Inception 4.2 4.7 5.2 A Output Voltage 10% Low; Figure 23
Output DC Current-Limit Shutdown Voltage 30 V
Current Share Accuracy (2 units paralleled) +2+5 % % of rated output current
Maximum Output Capacitance 1,500
µF
52.5Vout at 3.8A Resistive Load
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection 60 dB 120 Hz; Figure 20
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs) 400 mV 50-75-50% Iout max; 330µF cap; Figure 11
For a Step Change in Output Current (5A/µs) 400 mV 50-75-50% Iout max; 330µF cap; Figure 12
Settling Time 500 µs to within 1% Vout nom
Turn-On Transient
Turn-On Time 25 40 ms Full load, Vout=90% nom.; Figures 9 & 10
Start-Up Inhibit Time 180 200 240 ms
-40°C to +125°C; Figure A
Output Voltage Overshoot 0 % 1,500 µF load capacitance, Iout = 0A
EFFICIENCY
100% Load 92.3 % Figures 1 - 4
50% Load 91.7 % 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) 2250 V
Isolation Resistance 30 M
Ω
Isolation Capacitance
2
3300 pF
PQ60525HTA04 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 # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 4
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
Parameter
PMin. Typ. Max. Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency 275 300 325 kHz Regulation and Isolation stages
ON/OFF Control (Option P)
Off-State Voltage -2 0.8 V
On-State Voltage 2.7 18 V
ON/OFF Control (Option N)
Off-State Voltage 2.7 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 42 k
Ω
Output Voltage Trim Range -20 +10 % Measured across Pins 9 & 5; Figure C
Output Voltage Remote Sense Range +10 % Measured across Pins 9 & 5
Output Over-Voltage Protection 117 % Over full temp range; % of nominal Vout
Over-Temperature Shutdown 120 °C Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis 10 °C
Load Current Scale Factor TBD See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) 2.2 106Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
Calculated MTBF (MIL-217) 1.3 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 Logic Sense, Pin Length and
Feature Set 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 #s 5,999,417; 6,222,742 B1; 6,594,159
B2; 6,545,890 B2.
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 5
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
65
70
75
80
85
90
95
100
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Load Current (A)
Efficiency (%)
35 Vin
48 Vin
75 Vin
86
87
88
89
90
91
92
93
94
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
2
4
6
8
10
12
14
16
18
20
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
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.
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
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).
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 2540557085
Amb ie nt Air T e mp e r at ur e ( 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
from input to output (nominal input voltage).
Figure 6: Thermal plot of converter at 3.4 amp load current (179W)
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 1: Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
Semiconductor junction temperature
is within 1
°
C of surface temperature
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 6
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
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 output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 3.2 amp load current (168W)
with 55
°
C air flowing at the rate of 200 LFM. Air is flowing across the
converter from output to input (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (10 ms/div).
Input voltage pre-applied. Top Trace: Vout (20V/div). Bottom Trace:
ON/OFF input (5V/div)
Figure 10: Turn-on transient at zero load (10 ms/div). Top Trace: Vout
(20V/div). Bottom Trace: 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: 330
µ
F, electrolytic output
capacitance. Top trace: Vout (200mV/div), Bottom trace: Iout (1A/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: 330
µ
F, electrolytic output
capacitance. Top trace: Vout (200mV/div), Bottom trace: Iout (1A/div).
Semiconductor junction temperature
is within 1
°
C of surface temperature
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 7
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-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
15
µ
F,
450m
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 (500 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 (10 mA/div).
(See Figure 13)
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 1
µ
F ceramic capacitor
and 15
µ
F tantalum capacitor. Bandwidth: 20 MHz. (See Figure 13)
Figure 17: Output voltage response to step-change in input voltage
(1000V/ms). Load cap: 330
µ
F, electrolytic output capacitance. Ch 1: Vin
(20V/div), Ch 2: Vout (500mV/div).
Figure 18: Load current (2A/div) as a function of time when the con-
verter attempts to turn on into a 10 m
Ω
short circuit. Top trace
(2ms/div) is an expansion of the on-time portion of the bottom trace.
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 8
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
0.001
0.01
0.1
1
10
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.
-80
-70
-60
-50
-40
-30
-20
-10
0
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.
-30
-20
-10
0
10
20
30
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
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.
0
10
20
30
40
50
60
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Load Current (A)
Output Voltage (V)
35 V
48 V
75 V
Figure 23: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 9
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-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 half-brick, quarter-brick and eighth-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 8 and 6): The SENSE(+) inputs cor-
rect for voltage drops along the conductors that connect the con-
verter’s output pins to the load.
Pin 8 should be connected to Vout(+) and Pin 6 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 8 and 6 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 # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 10
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
across the output (pins 9 and 5) to determine when it should trig-
ger, not the voltage across the converter’s sense leads (pins 8
and 6). 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 7): 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 7 and Pin 6 (SENSE(-) input). For a desired decrease
of the nominal output voltage, the value of the resistor should be
Rtrim-down =
(
100%
)
- 2 (kΩ)
∆
where
∆% =Vnominal – Vdesired x100%
Vnominal
To increase the output voltage, the user should connect a resistor
between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase
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 52.5Vout 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
circuit 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.
Input Over-Voltage Shutdown: Available on PQ48 models
only. The converter turns off when the input voltage is too high,
allowing the converter to withstand an input voltage as high as
100V without destruction. The shutdown circuitry is a compara-
tor with DC hysteresis. When the input voltage exceeds the typi-
cal Input Over-Voltage Shutdown value, the converter will turn off.
Once the converter is off, it will turn back on when the input volt-
age falls below the minimum Input Over-Voltage Shutdown value.
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
1
10
100
1,000
10,000
100,000
0 2 4 6 8 101214161820
Trim Resistance (kOhms)
% Increase in Vout % Decrease in Vout
(kΩ)
Rtrim-up =
(
Vnominal – 2
)
xVDES + VNOM
1.225
VDES - VNOM
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 11
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
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
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 input
electrolytic capacitor. The recommended external input capaci-
tance is specified in the “Input Characteristics” 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 # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 12
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-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 Quarter-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.
FULL FEATURE APPLICATION NOTES
This section provides some basic application information for the
full-feature version of the
Power
Qor series converter. The pin-out
configuration for these optional feature pins is shown on page 2,
and the part numbering format is shown on the last page of this
specification sheet.
All units in this product family include back-drive protection to
simplify the use of multiple converters in a parallel or sequencing
application. However, any voltage applied to the output of the
converter should be kept below 120% of the rated output voltage
of the converter.
In addition to back-drive protection, these units include the fol-
lowing features (pins):
Current Share (pin 3): The active current share feature allows
for N+1 and parallel applications. To achieve load sharing,
directly connect the I share pins of multiple units. The load current
will share equally among the multiple units (±5% at full rated cur-
rent). It is important that the Vin(-) pins of the sharing units be
directly connected and NOT placed outside of an EMI filter or
other impedance path. The voltage at the I Share pin will range
from 0 to 5 volts (at full rated current), referenced to the primary-
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
25ms (typical
turn on time)
ON ON ON
OFF OFF
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 13
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
side ground, Vin(-).
Start Sync (pin B): The Start Synchronization pin will allow a
more consistent start-up sequence. To operate this feature, con-
nect together the Start-Sync pins of multiple current-sharing units.
This will permit immediate start-up with loads greater than the cur-
rent limit of a single unit. Without this connection, any set of con-
verters attempting to asynchronously start (or re-start) with a load
greater than the current limit of a single unit will "hiccup". This
“hiccup” mode will continue until one converter attempts a start
at the same time as the minimum number of additional units nec-
essary to sustain the load condition. For example, three 50 amp
units starting into a 90 amp load would require two units to simul-
taneously attempt a start. The Start Sync connection synchro-
nizes these starting attempts and provides a more consistent and
reliable start-up sequence. For details about the "hiccup mode"
or repeated startup attempts, please see the "Startup Inhibit
Period" note in this Technical Specification.
Clock Sync (pin A): The External Clock Synchronization pin
provides the ability for the user to control the EMI signature and
synchronize sensitive circuitry to quiet periods in the converter
operation. With this option, the converter can be synchronized to
an external clock signal whose frequency is greater than that of
the free-running internal clock. However, substantially raising the
converter’s frequency will reduce its efficiency. Therefore, the rec-
ommended frequency range for the external clock synchroniza-
tion signal applied to this pin would be the lowest value possible
without dropping below the maximum switching frequency value
listed on the Electrical Specifications page.
The following requirements should also be met:
• The external clock signal should be referenced to the
negative input voltage, Vin(-).
• The high level of the signal should be between 3.5V and
5.0V.
• The low level should be between -0.5V and +1.2V.
• Do not apply a clock signal lower than the specified fre-
quency.
Product # PQ60525HTA04 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HT652F Rev. B 03/08/04 Page 14
Input:
Input:
Output:
Output:
Current:
Current:
P
Package:
ackage:
35-75 V
35-75 V
52.5 V
52.5 V
3.8 A
3.8 A
(200W)
(200W)
Half-brick
Half-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.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format at www.synqor.com.
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.
PQ60 versions of the modules below indicate a unit with
100V for 100ms input voltage transient withstand (Telcordia
GR-513).
The following option choices must be included in place of the
x y z
spaces in the model numbers listed
Note 3: The 15th character “8”designates an alternate min-
imum bottom side clearance option available on the
PQ60525HTA04xxS model. Please see the mechanical draw-
ing on Page 2 for bottom side clearance and maximum hieght
for the “8” option.
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
Output Max Output
Voltage Current
PQ60012HTA60xyz 35 - 75 V 1.2 V 60 A
PQ48015HTA60xyz 35 - 75 V 1.5 V 60 A
PQ48018HTA60xyz 35 - 75 V 1.8 V 60 A
PQ48020HTA60xyz 35 - 75 V 2.0 V 60 A
PQ48025HTA60xyz 35 - 75 V 2.5 V 60 A
PQ48033HTA50xyz 35 - 75 V 3.3 V 50 A
PQ48050HTA33xyz 35 - 75 V 5.0 V 33 A
PQ48120HTA14xyz 35 - 75 V 12 V 13.75 A
PQ48150HTA11xyz 35 - 75 V 15 V 11 A
PQ60180HTA09xy S35 - 75 V 18 V 9.2 A
PQ60260HTB10xyz 35 - 75 V 26 V 9.6 A
PQ60525HTA04xyz 35 - 75 V 52.5 V 3.8 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
8 - Standard
with Alternate
Bottom Side
Clearance (see
Note 3 below)
F - Full Feature
Options Description: x y z
PQ 60 525 H T A 04 N K S
Product Family
Package Size
Performance Level
Thermal Design
Output Current
Options (see
Ordering Information)
Input Voltage
Output Voltage
