PQ48033QGA25NRS-G [SYNQOR]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8;
| 型号： | PQ48033QGA25NRS-G |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8 |
| 文件： | 总13页 (文件大小：744K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
25 Amp, No Heatsink, Isolated DC/DC Converter
The PQ60033QGA25 PowerQor™ Giga quarter-
brick converter is a next-generation, board-mount-
able, isolated, fixed switching frequency DC/DC
converter that uses synchronous rectification to
achieve extremely high conversion efficiency. The
power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight,
height, and application effort. All of the power and
control components are mounted to the multi-layer
PCB substrate with high-yield surface mount tech-
nology. Since the PowerQor converter has no
explicit thermal connections, it is extremely reliable.
PQ60033QGA25 Module
Operational Features
Protection Features
• Ultra-high efficiency, >88% at full rated load current
• Input under-voltage lockout disables converter at
• Delivers up to 25 amps of output current with mini-
mal derating - no heatsink required
low input voltage conditions
• Output current limit and short circuit protection
protects converter from excessive load current or
short circuits
• Wide input voltage range: 35V – 75V, with 100V
100ms input voltage transient withstand
• Fixed frequency switching provides predictable EMI
performance
• Output over-voltage protection protects load from
damaging voltages
• No minimum load requirement means no preload
• Thermal shutdown protects converter from abnor-
mal environmental conditions
resistors required
Mechanical Features
Safety Features
• Industry standard quarter-brick pin-out configuration
• Industry standard size: 1.45” x 2.3”
• 2000V, 10 MΩ input-to-output isolation provides
input/output ground separation
• Total height less than 0.40”, permits better airflow
• UL/cUL 60950 recognized (US & Canada), basic
and smaller card pitch
insulation rating
• Total weight: 34 grams (1.2 oz.), lower mass great-
ly reduces vibration and shock problems
• TUV certified to EN60950
• Meets 72/23/EEC and 93/68/EEC directives
which facilitates CE Marking in user’s end product
Control Features
• Board and plastic components meet UL94V-0 flam-
mability requirements
• 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
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 1
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
MECHANICAL
DIAGRAM
2.30
(58.4)
0.14
(3.6)
2.00
0.300
(7.62)
(50.8)
0.150
(3.81)
0.43
(10.9)
0.300
(7.62)
1.45
0.450
0.600
(15.24)
(36.8)
0.600
(15.24)
(11.43)
Top View
Max. Height
0.40
(10.2)
Bottom side
Clearance
See Note 9
Side View
0.063+/-0.026
(1.60+/-0.66)
Lowest
Component
Load Board
0.145
(3.68)
See Note 3
NOTES
PIN CONNECTIONS
1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter with
0.080” (2.03 mm) diameter standoff shoulders.
Pin No. Name
Function
1
2
Vin(+)
Positive input voltage
2) Pins 4 and 8 are 0.062” (1.57 mm) diameter with
0.100” (2.54 mm) diameter standoff shoulders.
ON/OFF
TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
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
3
4
5
6
7
8
Vin(-)
Vout(-)
SENSE(-)
TRIM
SENSE(+)
Vout(+)
Negative input voltage
Negative output voltage
Negative remote sense1
Output voltage trim2
Positive remote sense3
Positive output voltage
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: 1.2 oz. (34g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
Notes:
9) 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 consid-
ered part of the input/primary circuit.
1. Pin 5 must be connected to Vout(-).
2. Leave Pin 6 open for nominal output voltage.
3. Pin 7 must be connected to Vout(+).
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 2
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
PQ60033QGA25 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
100
80
V
V
continuous
Operating
continuous
Operating Transient Protection
100
2000
100
125
18
V
100ms transient
Basic level, Pollution Degree 2
Isolation Voltage (input to output)
Operating Temperature
V
-40
-55
-2
°C
°C
V
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
35
48
75
V
32
28.5
2.5
33
29.5
3.5
34
30.5
4.5
2.6
120
3
V
V
V
A
100% Load, 35 Vin
No-Load Input Current
80
1.6
0.01
150
3
mA
mA
Disabled Input Current
2
Inrush Current Transient Rating
Response to Input Transient
Input Reflected-Ripple Current
Recommended Input Fuse
Input Filter Component Values (C\L)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
A s
mV
mA
A
1000V/ms input transient
P-P thru 10µH inductor; Figs. 13 & 15
fast blow external fuse recommended
20
2.46\4.7
47
µF\µH internal values, see Figure E
33
µF
V
see Figure 13
3.267
3.300
3.333
+
+
+
0.05 \ 2
0.05 \ 2
0.15 \ 5
0.15 \ 5
%\mV
%\mV
mV
+
Over Load
+
+
50
Over Temperature
17
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
3.207
3.393
V
over sample, line, load, temperature & life
20MHz bandwidth; Fig. 13 & 16
Full Load, see Figures 13 & 16
50
100
20
mV
mV
A
RMS
10
Full Load, see Figures 13 & 16
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage During Load Current Transient
Step Change in Output Current (0.1A/µs)
Step Change in Output Current (5A/µs)
Settling Time
0
25
26
30
1.7
1.0
10
34
A
Output Voltage 10% Low; Fig. 17
V
0.5
0
2.0
50
A
Negative current drawn from output
Negative current drawn from output
3.3Vout at 25A Resistive Load
mA
µF
20,000
82
dB
120 Hz; Fig. 20
160
160
400
mV
mV
µs
50% to 75% to 50% Iout max; Figure 11
50% to 75% to 50% Iout max; Figure 12
to within 1% Vout nom
Turn-On Transient
Turn-On Time
4
200
0
8
ms
ms
%
Full load, Vout=90% nom.; Figs. 9 & 10
-40°C to +125°C; Figure F
Start-Up Inhibit Time
180
215
Output Voltage Overshoot
EFFICIENCY
10,000 µF load capacitance, Iout = 0A
100% Load
88
89
%
%
Figures 1 - 4
Figures 1 - 4
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
125
125
125
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage
2000
10
V
Isolation Resistance
M
Ω
Isolation Capacitance
470
pF
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 3
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
Min.
Typ.
Max.
Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency
220
240
260
kHz
ON/OFF Control (Option P)
Off-State Voltage
-2
0.8
18
V
V
On-State Voltage
2.4
ON/OFF Control (Option N)
Off-State Voltage
2.4
-2
18
V
On-State Voltage
0.8
V
ON/OFF Control (Either Option)
Pull-Up Voltage
Figures A, B
V
Vin/6.5
40
9.2
Pull-Up Resistance
kΩ
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF
-20
+10
+10
127
%
Measured across Pins 8 & 4; Figure C
Measured across Pins 8 & 4
%
%
117
122
125
10
Over full temp range; % of nominal Vout
Average PCB Temperature
°C
°C
106 Hrs. Telcordia TR-NWT-000332; 80% load,300LFM, 40 C T
o
2.8
1.8
a
Calculated MTBF
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40 C T
o
a
Demonstrated MTBF
>25
106 Hrs. Field demonstrated MTBF
STANDARDS COMPLIANCE
Parameter
P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
EN60950
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP
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
QUALIFICATION TESTING
Parameter
P
# Units Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in z axis
-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003
Vibration
5
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
5
10
5
5
5
Solderability
15 pins
•
Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply
robust, reliable product. Contact factory for more information about Proof of Design and Proof of Manufacturing processes.
OPTIONS
PATENTS
SynQor provides various options for Logic Sense, Pin Length and SynQor is protected under various patents, including but not lim-
Feature Set for this family of DC/DC converters. Please consult the ited to U.S. Patent # 5,999,417.
last page of this specification sheet for information on available
options.
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 4
Performance Curves
Brick
Quarter
48V 3.3V
25A
out
in
95
90
85
80
75
70
65
60
90
89
88
87
86
85
84
83
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
82
0
100
200
300
400
500
0
3
5
8
10
13
15
18
20
23
25
Air Flow (LFM)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for min-
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
imum, nominal, and maximum input voltage at 25
°C.
airflow rate for ambient air temperatures of 25
(nominal input voltage).
°C, 40°C, and 55°C
14
12
10
8
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
6
4
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
2
0
0
3
5
8
10
13
15
18
20
23
25
0
100
200
300
400
500
Load Current (A)
Air Flow (LFM)
Figure 3: Power dissipation at nominal output voltage vs. load current
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).
for minimum, nominal, and maximum input voltage at 25
°C.
°
°
°
25
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
5
0
Semiconductor junction temperature is
within 1 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
across the converter from pin 1 to pin 3 (nominal input voltage).
Figure 6: Thermal plot of converter at 23 amp load current with 55°C
air flowing at the rate of 200 LFM. Air is flowing across the converter
sideways from pin 1 to pin 3 (nominal input voltage).
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 5
Performance Curves
Brick
Quarter
48V 3.3V
25A
out
in
25
20
15
10
5
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
0
Semiconductor junction temperature is
within 1 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Figure 7: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
lengthwise from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 23 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) (2 ms/div).
Ch 1: Vout (1V/div)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: Vout (1V/div)
Ch 2: ON/OFF input (5V/div)
Ch 2: ON/OFF input (5V/div)
Figure 11: Output voltage response to step-change in load current (50%-75%-50%
Figure 12: Output voltage response to step-change in load current (50%-75%-
of Iout(max); dI/dt = 0.1A/
µ
s). Load cap: 10
µ
F, 100 m
Ω
ESR tantalum capacitor
50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 30 mΩ ESR tantalum
and 1
µF ceramic capacitor. Ch 1: Vout (100mV/div), Ch 2: Iout (5A/div).
capacitor and 1
µ
F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (5A/div).
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 6
Performance Curves
Brick
Quarter
48V 3.3V
25A
out
in
Figure 15
10
µH
Figure 14
source
impedance
Figure 16
iS
iC
DC/DC
Converter
VOUT
VSOURCE
10
µ
Ω
F,
ESR
1 µF
47 µF,
ceramic
100m
<1
Ω ESR
capacitor
tantalum
electrolytic
capacitor
capacitor
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).
Figure 14: Input Terminal Ripple Current, i , at full rated output cur-
c
rent and nominal input voltage with 10
µH source impedance and 47µF
electrolytic capacitor (100 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, i , through a 10 µH source
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 1 F ceramic capacitor
and 10 F tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
s
inductor at nominal input voltage and rated load current (10 mA/div).
See Figure 13.
µ
µ
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
36 V
48 V
75 V
0
5
10
15
20
25
30
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit
Figure 18: Load current (20A/div) as a function of time when the con-
verter attempts to turn on into a 10 m short circuit. Top trace
(2.5ms/div) is an expansion of the on-time portion of the bottom trace.
curves and converter shutdown points.
Ω
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B 6/26/02 Page 7
Performance Curves
Brick
Quarter
48V 3.3V
25A
out
in
1
0.1
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
36 Vin
48 Vin
75 Vin
36 Vin
48 Vin
75 Vin
0.01
0.001
0.0001
-110
10
10
100
1,000
Hz
10,000
100,000
100
1,000
Hz
10,000
100,000
Figure 19: Magnitude of incremental output impedance (Z
=
Figure 20: Magnitude of incremental forward transmission (FT =
out
v
/i ) for minimum, nominal, and maximum input voltage at full
v
/v ) for minimum, nominal, and maximum input voltage at full
out in
out out
rated power.
rated power.
100
0
-10
-20
-30
-40
-50
-60
10
1
36 Vin
48 Vin
75 Vin
36 Vin
48 Vin
75 Vin
-70
10
0.1
10
100
1,000
Hz
10,000
100,000
100
1,000
Hz
10,000
100,000
Figure 21: Magnitude of incremental reverse transmission (RT =
Figure 22: Magnitude of incremental input impedance (Z = v /i
)
in
in in
i
/i ) for minimum, nominal, and maximum input voltage at full rated
for minimum, nominal, and maximum input voltage at full rated
in out
power.
power.
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 8
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The PowerQor series converter uses a two-stage power circuit
topology. The first stage is a buck-converter that keeps the out-
put 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.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, per-
mits 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 cir-
cuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal ON/OFF circuitry.
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 recti-
fiers. These devices, which are MOSFETs with a very low on-
state resistance, dissipate far less energy than Schottky diodes.
This is the primary reason that the PowerQor converter has such
high efficiency, even at very low output voltages and very high
output currents.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not
required, the PowerQor converter does not need a metal base-
plate or potting material to help conduct the dissipated energy
to the heatsink. The PowerQor converter can thus be built more
simply and reliably using high yield surface mount techniques
on a PCB substrate.
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 volt-
age drop only as large as that specified in this datasheet, that
is
[Vout(+) - Vout(-)] – [SENSE(+) - SENSE(-)] <
Sense Range % x Vout
The PowerQor series of half-brick and quarter-brick converters
uses the industry standard footprint and pin-out configuration.
Pins 7 and 5 must be connected for proper regulation of the
output voltage. If these connections are not made, the convert-
er will deliver an output voltage that is slightly lower than its
specified value.
ON/OFF
ON/OFF
ON/OFF
_
_
_
Vin( )
Vin( )
Vin( )
Vin(+)
5V
Positive Logic
(Permanently Enabled)
Negative Logic
(Permanently Enabled)
Remote Enable Circuit
274k
5V
ON/OFF
ON/OFF
50k
TTL
TTL/
CMOS
ON/OFF
100pF
50k
_
Vin( )
_
_
Vin( )
Vin( )
Open Collector Enable Circuit
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Figure B: Internal ON/OFF pin circuitry
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 9
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
Note: the output over-voltage protection circuit senses the volt-
age across the output (pins 8 and 4) to determine when it
should trigger, 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.
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.
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.
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.
To decrease the output voltage, the user should connect a resis-
tor between Pin 6 and Pin 5 (SENSE(-) input). For a desired
decrease of the nominal output voltage, the value of the resis-
tor should be
PROTECTION FEATURES
511
R
=
- 10.22 (kΩ)
trim-down
( ∆%)
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
application note titled “Input System Instability”. The lockout cir-
cuitry is a comparator with DC hysteresis. When the input volt-
age is rising, 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 volt-
age must fall below the typical Turn-Off Voltage Threshold value
before the converter will turn off.
where
Vnominal – Vdesired
Vnominal
=
x 100%
∆%
(
)
To increase the output voltage, the user should connect a resis-
tor between Pin 6 and Pin 7 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be
5.11VOUT(100+∆%)
1.225∆%
511
Output Current Limit: The maximum current limit remains
constant as the output voltage drops. However, once the imped-
ance 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.
_
_
R
=
trim-up
where
(kΩ)
10.22
)
(
∆%
V
= Nominal Output Voltage
OUT
Figure C graphs the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the out-
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.
put voltage can be trimmed up or down.
10,000
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 dam-
age 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 cur-
rent 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.
1,000
100
10
1
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
0
2
4
6
8
10
12
14
16
18
20
% increase Vout
% decrease Vout
Figure C: Trim Graph for 3.3Vout module
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 10
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
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.
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
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 com-
ponents. This filter dramatically reduces input terminal ripple
current, which otherwise could exceed the rating of an external
electrolytic input capacitor. The recommended external input
capacitance is specified in the “Input Characterisitcs” section.
Vout(+)
Vin(+)
Electrolytic
Capacitor
Vsense(+)
33µF
External
Input
R
trim-up
or
ESR
1Ω
Vin
Trim
ON/OFF
Filter
C
R
load
trim-down
Iload
_
Vsense( )
_
_
Vin( )
Vout( )
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+)
C
_
Vin( )
Figure E: Internal Input Filter Diagram (component values listed on page 3).
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 11
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
Startup Inhibit Period: The Startup Inhibit Period ensures
that the converter will remain off for at least 200ms when it is
shut down for any reason. When an output short is present,
this generates a 5Hz "hiccup mode," which prevents the con-
verter from overheating. In all, there are seven ways that the
converter can be shut down, initiating a Startup Inhibit Period:
Before time t0, when the input voltage is below the UVL thresh-
old, the unit is disabled by the Input Under-Voltage Lockout fea-
ture. 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.
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
At time t1, the unit is disabled by the ON/OFF pin, and it can-
not 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.
• 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:
V
in
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
ON
OFF
ON
OFF
ON
4ms (typical
turn on time)
V
out
200ms
(typical start-up
inhibit period)
200ms
200ms
t
t0
t1
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 12
Technical Specification
Quarter
48V 3.3V
25A
out
in
Brick
ORDERING INFORMATION
PART NUMBERING SYSTEM
The tables below show the valid model numbers and order-
ing 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 part numbering system for SynQor’s PowerQor DC/DC
converters follows the format shown in the example below.
PQ 48 033 H T A 50 N K S
Options (see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Output Max Output
Model Number
Input Voltage
Voltage Current
PQ48015QGA25xyz
PQ48018QGA25xyz
PQ48020QGA25xyz
PQ48025QGA25xyz
PQ48033QGA25xyz
PQ48050QGA20xyz
PQ48060QGA17xyz
PQ48120QGA08xyz
PQ48150QGA07xyz
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
35 - 75 V
1.5 V
1.8 V
2.0 V
2.5 V
3.3 V
5.0 V
6.0 V
12 V
25 A
25 A
25 A
25 A
25 A
20 A
16.7 A
8.3 A
6.7 A
Output Voltage
Input Voltage
Product Family
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 avail-
able in stock for evaluation and prototype quantities.
15 V
The following option choices must be included in place of
the x y z spaces in the model numbers listed above.
Options Description: x y z
Enable
Logic
Pin
Feature
Set
Length
Application Notes
K - 0.110"
P - Positive N - 0.145"
N - Negative R - 0.180"
Y - 0.250"
S - Standard
A variety of application notes and technical white papers
can be downloaded in pdf format at www.synqor.com.
Contact SynQor for further information:
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.
Phone:
Toll Free: 888-567-9596
Fax:
508-485-8434
508-485-8414
E-mail:
Web:
sales@synqor.com
www.synqor.com
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.
Address: 188 Central Street
Hudson, MA 01749
Product # PQ60033QGA25
Phone 1-888-567-9596
Doc.# 005-2QG633D Rev. B
6/26/02
Page 13
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