PQ24033QGA25NRS [SYNQOR]
Quarter-brick DC/DC Converter; 四分之一砖DC / DC转换器
| 型号： | PQ24033QGA25NRS |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | Quarter-brick DC/DC Converter |
| 文件： | 总13页 (文件大小：575K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical
Specification
PQ24033QGA25
18-36V
3.3V
Output
25Amp 2000Vdc
Quarter-brick
DC/DC Converter
Input
Current
Isolation
®
The PQ24033QGA25 PowerQor Giga quarter-brick con-
verter is a next-generation, board-mountable, isolated, fixed
switching frequency DC/DC converter that uses synchro-
nous rectification to achieve extremely high conversion effi-
ciency. 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 technology.
Since the
PowerQor converter has no explicit thermal interfaces, it is
extremely reliable. RoHS Compliant (see page 12).
PQ24033QGA25 Module
Operational Features
• Ultra-high efficiency, 87% at full rated load current
Protection Features
• Delivers up to 25 amps of output current with minimal
derating - no heatsink required
• 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
• Wide input voltage range: 18V – 36V meets or
exceeds all 24V bus standards
• Fixed frequency switching provides predictable EMI per-
formance
• No minimum load requirement means no preload resis-
tors required
• Active back bias limit prevents damage to converter
from external load induced pre-bias
• Output over-voltage protection protects load from dam-
aging voltages
Mechanical Features
• Thermal shutdown protects converter from abnormal
• Industry standard quarter-brick pin-out configuration
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
environmental conditions
• Total height less than 0.40” (10.2mm), permits better
Safety Features
airflow and smaller card pitch.
• Total weight: 1.2 oz. (34 grams)
• 2000V, 30 MΩ input-to-output isolation provides
input/output ground separation
• Flanged pins designed to permit surface mount solder-
ing (can avoid wave solder) using FPiP technique
• UL/cUL 60950-1 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950-1
Control Features
• Meets 72/23/EEC and 93/68/EEC directives which
• On/Off control referenced to input side (positive and
negative logic options are available)
facilitates CE Marking in user’s end product
• Board and plastic components meet UL94V-0 flamma-
bility requirements
• NEBS and ETSI compliant
• Remote sense for the output voltage compensates for
output distribution drops
• Output voltage trim permits custom voltages and volt-
age margining
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 1
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
MECHANICAL
2.30
(58.4)
DIAGRAM
0.14
(3.6)
2.00
(50.8)
0.300
(7.62)
0.150
(3.81)
0.43
(10.9)
0.300
(7.62)
1.45
(36.8)
0.450
0.600
(11.43)
0.600
(15.24)
(15.24)
Top View
Max. Height
0.40
(10.2)
Bottom side
Clearance
See Note 9
Side View
0.047+/-0.015
(1.19+/-0.38)
Lowest
Component
Flanged Pin
See Note 10
Load Board
0.145
(3.68)
See Note 3
NOTES
PIN DESIGNATIONS
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
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
Finish (RoHS 5/6) - Tin/Lead over Nickel plate
Finish (RoHS 6/6) - Matte Tin 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: 1.2 oz. (34 g) 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 considered part of the
input/primary circuit.
1. SENSE(-) should be connected to Vout(-) either remotely or at the converter.
2. Leave TRIM pin open for nominal output voltage.
3. SENSE(+) should be connected to Vout(-) either remotely or at the converter.
10) The flanged pins are designed to permit surface mount
soldering (allowing to avoid the wave soldering process)
through the use of the flanged pin-in-paste technique.
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 2
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
PQ24033QGA25 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=24Vdc 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
50
40
V
V
Continuous
Operating
Continuous
Operating Transient Protection
50
V
< 10µs, 1% duty cycle
Basic insulation, Pollution Degree 2
Isolation Voltage (input to output)
Operating Temperature
2000
100
125
18
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 Voltage Hysteresis
Maximum Input Current
18
24
36
V
15.5
14.0
1.0
16
14.5
1.5
16.5
15.0
2.0
5.2
140
3
V
V
V
A
100% Load, 18 Vin
No-Load Input Current
100
1.6
20
mA
mA
mA
mA
A
Disabled Input Current
Input Reflected Ripple Current
Input Terminal 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
P-P thru 3.3µH inductor; Figures 13 & 15
RMS; Figures 13 & 14
280
20
Fast blow external fuse recommended
4.5\1.5
100
µF\µH Internal values; see Figure E
µF
V
Typical ESR 0.1-0.2Ω; see Figure 13
3.267
3.21
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
3.39
V
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 13 & 16
Full Load; see Figures 13 & 16
1
Output Voltage Ripple and Noise
Peak-to-Peak
30
60
20
25
34
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
For a Step Change in Output Current (0.1A/µs)
For a Step Change in Output Current (5A/µs)
Settling Time
0
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low; Figure 17
26
30
1.7
1.4
10
A
V
0.8
0
2.5
20
A
Negative current drawn from output
Negative current drawn from output
3.3Vout at 25A Resistive Load
mA
µF
20,000
66
dB
120 Hz; Figure 20
160
160
500
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
1
4
200
0
8
ms
ms
%
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C; Figure F
Start-Up Inhibit Time
180
240
Output Voltage Overshoot
EFFICIENCY
10,000 µF load capacitance, Iout = 0A
100% Load
87
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 (dielectric strength)
Isolation Resistance
2000
30
V
M
Ω
Isolation Capacitance2
470
pF
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 # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 3
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
Min.
Typ.
Max.
Units Notes & Conditions
FEATURE CHARACTERISTICS
Buck Stage Switching Frequency
Isolation Stage Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
220
220
240
240
260
260
kHz
kHz
-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/3
33
9.6
Pull-Up Resistance
kΩ
1
Output Voltage Trim Range
-20
+10
+10
127
%
Measured across Pins 8 & 4; Figure C
Measured across Pins 8 & 4
Output Voltage Remote Sense Range
Output Over-Voltage Protection
Over-Temperature Shutdown
%
%
117
122
125
10
Over full temp range; % of nominal Vout
Average PCB Temperature
°C
°C
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
588
See App Note: Output Load Current Calc.
o
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
2.8
1.8
106 Hrs. TR-NWT-000332; 80% load,300LFM, 40 C T
a
a
Calculated MTBF (MIL-217)
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40 C T
o
Field Demonstrated MTBF
106 Hrs. See our website for details
1. Trim-up range may be limited when Vin is below 20V and Iout is simultaneously above 20A.
STANDARDS COMPLIANCE
Parameter
P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1
EN60950-1
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
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 (Normal Performance)
GR-1089-CORE
Section 7 - electrical safety, Section 9 - bonding/grounding
•
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
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
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 the factory for official product family qualification documents.
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 #s 5,999,417; 6,222,742 B1; 6,594,159
last page of this specification sheet for information on available B2; 6,545,890 B2.
options.
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 4
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
95
90
85
80
75
70
65
60
90
89
88
87
86
85
84
83
82
25 C
40 C
55 C
18Vin
24Vin
36Vin
0
3
5
8
10
13
15
18
20
23
25
0
100
200
300
400
500
Load Current (A)
Air Flow (LFM)
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
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
14
12
10
8
6
18Vin
24Vin
36Vin
4
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
Air Flow (LFM)
Load Current (A)
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
Semiconductor junction temperature is
within 1 C of surface temperature
°
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
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
from input to output (nominal input voltage).
Figure 6: Thermal plot of converter at 20 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).
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 5
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
25
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
100 LFM (0.5 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
from pin 1 to pin 3 (nominal input voltage).
Figure 8: Thermal plot of converter at 19 amp load current with 55°C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from pin 1 to pin 3 (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (2 ms/div).
Input voltage pre-applied. Ch 1: Vout (1V/div). Ch 2: ON/OFF input
(5V/div)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: Vout (1V/div)
Ch 2: ON/OFF input (5V/div)
Figure 11: Output voltage response to step-change in load current (50%-75%-
Figure 12: 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 tantalum capac-
50% of Iout(max): dI/dt = 5A/
µs). Load cap: 470µF, 30 mΩ ESR tantalum
itor and 1 F ceramic capacitor. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
µ
capacitor and 1 F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
µ
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 6
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
See Fig. 15
3.3 µH
See Fig. 14
source
impedance
See Fig. 16
iS
iC
DC/DC
Converter
VOUT
VSOURCE
10
µ
Ω
F,
ESR
1 µF
100
µ
F,
ESR
ceramic
100m
≅0.33
Ω
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 3.3
µH source impedance and
100 F electrolytic capacitor (500 mA/div). See Figure 13.
µ
Figure 15: Input reflected ripple current, i , through a 3.3 µH source
inductor at nominal input voltage and rated load current (20 mA/div).
See Figure 13.
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
µ
µ
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
18 V
1.0
24 V
0.5
0.0
36 V
0
5
10
15
20
25
30
35
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
Figure 18: Load current (10A/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.
Ω
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 7
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
0
-10
-20
-30
-40
-50
-60
-70
-80
1
0.1
0.01
0.001
18 Vin
24 Vin
36 Vin
18 Vin
24 Vin
36 Vin
10
100
1,000
Hz
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Figure 19: Magnitude of incremental output impedance (Z
=
Figure 20: Magnitude of incremental forward transmission (FT =
v /v ) for minimum, nominal, and maximum input voltage at full
out in
rated power.
out
v
/i ) for minimum, nominal, and maximum input voltage at full
out out
rated power.
10
0
100
-10
-20
-30
-40
-50
10
1
18 Vin
24 Vin
36 Vin
18 Vin
24 Vin
36 Vin
0.1
10
-60
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 =
/i ) for minimum, nominal, and maximum input voltage at full rated
power.
Figure 22: Magnitude of incremental input impedance (Z = v /i )
in in in
for minimum, nominal, and maximum input voltage at full rated power.
i
in out
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 8
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
BASIC OPERATION AND FEATURES
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,
are two versions of the converter that differ by the sense of the
logic used for the ON/OFF input.
The PowerQor 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.
Vin(-). There
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.
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 PowerQor converter has such high effi-
ciency, even at very low output voltages and very high output cur-
rents.
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.
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 baseplate or pot-
ting 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 voltage
drop only as large as that specified in this datasheet, that is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
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 out-
put voltage. If these connections are not made, the converter will
deliver an output voltage that is slightly higher than its specified
value.
Note: the output over-voltage protection circuit senses the voltage
ON/OFF
ON/OFF
ON/OFF
_
_
_
Vin( )
Vin( )
Vin( )
Vin(+)
5V
Positive Logic
(Permanently Enabled)
Negative Logic
(Permanently Enabled)
Remote Enable Circuit
100k
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 # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 9
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
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.
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.
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). For a desired decrease
of the nominal output voltage, the value of the resistor should be
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.
511
R
=
- 10.22 (kΩ)
trim-down
( ∆%)
where
Vnominal – Vdesired
Vnominal
=
x 100%
∆%
To increase the output voltage, the user should connect a resistor
between Pin 6 and Pin 7 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be
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.
5.11VOUT(100+∆%)
1.225∆%
511
_
_
R
=
trim-up
where
(kΩ)
10.22
)
(
∆%
V
= Nominal Output Voltage
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.
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.
10,000
1,000
100
10
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
value.
1
0
2
4
6
8
10
12
14
16
18
20
% increase Vout
% decrease Vout
Figure C: Trim Graph for 3.3Vout 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-
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 10
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
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:
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.
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
Application Circuits: Figure D below provides a typical cir-
cuit diagram which details the input filtering and voltage trim-
ming.
• Short Circuit Protection
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 Characteristics” section.
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
• 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 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
Vout(+)
Vin(+)
Vsense(+)
Electrolytic
Capacitor
External
Input
R
trim-up
or
100µF
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 # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 11
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
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.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium,
Hexavalent Chromium, Mercury, Polybrominated Biphenyls
(PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical
and Electronic Equipment. This SynQor product is available as
5/6 RoHS compliant (product with lead) or 6/6 RoHS compliant.
For more information please refer to SynQor’s RoHS addendum
available at our RoHS Compliance / Lead Free Initiative web
page or e-mail us at rohs@synqor.com.
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 # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 12
Input:
18-36 V
Output:
3.3 V
Current:
25 A (82.5W)
Package:
Quarter-brick
Technical Specification
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s PowerQor DC/DC
converters follows the format shown in the example below.
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. To
order 6/6 RoHS compliant product please add a “-G” suffix.
PQ 24 033 Q G A 25 N N S
Options (see
Ordering Information)
Output Current
Output Max Output
Voltage Current
Model Number
Input Voltage
Thermal Design
Performance Level
Package Size
PQ24018QGA25xyz
PQ24033QGA25xyz
PQ24050QGA20xyz
PQ24120QGA08xyz
PQ24150QGA07xyz
18 - 36 V
18 - 36 V
18 - 36 V
18 - 36 V
18 - 36 V
1.8 V
3.3 V
5.0 V
12 V
15 V
25 A
25 A
20 A
8.3 A
6.7 A
Output Voltage
Input Voltage
Product Family
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
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. A “-G” suffix indi-
cates 6/6 RoHS compliance.
Options Description: x y z
Enable
Pin
Feature
Logic
Length
Set
K - 0.110"
P - Positive N - 0.145"
N - Negative R - 0.180"
Y - 0.250"
S - Standard
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
Contact SynQor for further information:
Warranty
Phone:
978-849-0600
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Toll Free: 888-567-9596
Fax:
978-849-0602
E-mail:
Web:
power@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: 155 Swanson Road
Boxborough, MA 01719
USA
Product # PQ24033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG233D Rev. B
08/17/06
Page 13
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