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Technical S pecification
PQ40033QGA25
18-75V
Input
3.3V
Output
25Amp
Current
2000Vdc
Isolation
Quar ter-brick
DC/DC Conver ter
The PQ400 33QGA25 PowerQorTM Giga quarter-brick converter is a next-generation, board-mountable, 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 technology for greater reliability. The PQ40 module offers a wide input voltage range to cover both 24V and 48V applications. RoHS Compliant (see page 12 ). Operational Features
* High efficiency, 88.5% at full rated load current * Delivers up to 25 amps of output current (82W) with minimal derating - no heatsink required * Ultra wide input voltage range: 18V - 75V, with 100V 100ms input voltage transient capability * Fixed frequency switching provides predictable EMI performance * No minimum load requirement means no preload resistors required
PQ40033QGA25 Module
Pr otection Features
* Input under-voltage lockout disables converter at low input voltage conditions * Output current limit and short circuit protection protects converter and load from permanent damage and consequent hazardous conditions * Active back bias limit prevents damage to converter from external load induced pre-bias * Output over-voltage protection protects load from damaging voltages * Thermal shutdown protects converter from abnormal environmental conditions
Mechanical Features
* Industry standard quarter-brick pin-out configuration * Industry standard size: 1.45" x 2.3" (36.8x58.4mm) * Total height only 0.43" (10.9mm), permits better airflow and smaller card pitch * Total weight: 1.2 oz. (34 grams) * Flanged pins designed to permit surface mount soldering (avoid wave solder) using FPiP technique
Safety Features
* 2000V, 30 M input-to-output isolation provides input/output ground separation * UL/cUL 60950-1 recognized (US & Canada), basic insulation rating * TUV certified to EN60950-1 * Meets 72/23/EEC and 93/68/EEC directives which facilitates CE Marking in user's end product * Board and plastic components meet UL94V-0 flammability requirements
Contr ol 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
Product # PQ40033QGA25 Phone 1-888-567-9596 www.synqor.com
Doc.# 005-2QG333D Rev. B
05/05/06
Page 1
Technical Specification
MECHANICAL DIAGRAM
0.14
(3.6)
Input: Output: Current: Package:
2.30
(58.4)
18-75 V 3.3 V 25 A Quarter-brick
0.600
(15.24)
0.450
(11.43)
2.00
(50.8)
0.300
(7.62)
0.150
(3.81)
0.43
(10.9)
1
0.600
(15.24)
8 7 6 5 4
1.45
(36.8)
2 3
0.300
(7.62)
Top View
Overall Height
Bottom side Clearance
See Note 9
0.397 0.15
(10.8 0.38)
0.031 0.027
(0.79 0.68)
Side View
0.145
(3.68) See Note 3 Lowest Component Load Board Flanged Pin See Note 10
NOTES
1) Pins 1-3, 5-7 are 0.040" (1.02mm) diameter with 0.080" (2.03 mm) diameter standoff shoulders. 2) Pins 4 and 8 are 0.062" (1.57 mm) diameter with 0.100" (2.54 mm) diameter standoff shoulders. 3) Other pin extension lengths available. Recommended pin length is 0.03" (0.76mm) greater than the PCB thickness. 4) All Pins: Material - Copper Alloy Finish (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 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.
PIN DESIGNATIONS
Pin No.
1 2 3 4 5 6 7 8
Notes: 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.
Name
Vin(+) ON/OFF Vin(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+)
Function
Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up. Negative input voltage Negative output voltage Negative remote sense1 Output voltage trim2 Positive remote sense3 Positive output voltage
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 # PQ40033QGA25 Phone 1-888-567-9596
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Doc.# 005-2QG333D Rev. B
05/05/06
Page 2
Technical Specification
PQ40033QGA25 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
TA=25C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Min. Typ. Max.
100 80 100 2000 100 125 18 48 16.7 15.1 1.6 80 1.6 100 5 200 1.5\6.6 47 3.267 3.300 75 17.2 15.6 2.1 5.4 140 4 0.03
Units
V V V V C C V V V V V A mA mA A 2s mV mA mA A H\F F V %\mV %\mV mV V mV mV A A V A mA F dB mV mV s
Notes & Conditions
Continuous Continuous 100ms transient, square wave Basic insulation, Pollution Degree 2
Input Voltage Non-Operating Operating Operating Transient Protection Isolation Voltage (input to output) Operating Temperature Storage Temperature Voltage at ON/OFF input pin Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Maximum Input Current No-Load Input Current Disabled Input Current Inrush Current Transient Rating Response to Input Transient Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (L\C) Recommended External Input Capacitance Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise1 Peak-to-Peak RMS 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 Input Voltage Ripple Rejection Output Voltage During Load Current Transient For a Step Change in Output Current (0.1A/s) For a Step Change in Output Current (5A/s) Settling Time Turn-On Transient Turn-On Time Start-Up Inhibit Time Output Voltage Overshoot
-40 -55 -2 18 16.2 14.6 1.1
INPUT CHARACTERISTICS
100% Load, 18 Vin
20
1000V/ms input transient, 18V-48V step P-P thru 10H inductor; Figures 17 & 19 RMS; Figures 17 & 18 Fast blow external fuse recommended Internal values; see Figure E Typical ESR 0.1-0.2; see Figure 17
OUTPUT CHARACTERISTICS
3.333
3.207
+0.05 \ 2 +0.15 \ 5 +0.05 \ 2 +0.15 \ 5 +17 +50 3.393 50 10 29 1.9 0.8 10 55 100 100 400 100 20 25 31 1.5 50 20,000
0 26 0.2 0
Over sample, line, load, temperature & life 20MHz bandwidth; Figures 17 & 20 Full Load; see Figures 17 & 20 Full Load; see Figures 17 & 20 Subject to thermal derating; Figures 5 - 12 Output Voltage 10% Low; Figure 21 Negative current drawn from output Negative current drawn from output 3.3Vout at 25A Resistive Load 120 Hz; Figure 24 50% to 75% to 50% Iout max; Figure 15 50% to 75% to 50% Iout max; Figure 16 To within 1% Vout nom Full load, Vout=90% nom.; Figures 13 & 14 -40C to +125C; Figure F 20,000 F load capacitance, Iout = 0A Figures Figures Figures Figures 1 1 1 1 4, 4, 4, 4, 24Vin 24Vin 48Vin 48Vin
DYNAMIC CHARACTERISTICS
180
12 200 0 88.5 90.0 87.5 89.0
14 240
ms ms % % % % %
EFFICIENCY
100% Load (24Vin) 50% Load (24Vin) 100% Load (48Vin) 50% Load (48Vin) Semiconductor Junction Temperature Board Temperature Transformer Temperature Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance2
TEMPERATURE LIMITS FOR POWER DERATING CURVES
125 125 125 2000 30 470
C C C V M pF
Package rated to 150C UL rated max operating temp 130C See Figures 5 - 12 for derating curves
ISOLATION CHARACTERISTICS
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 # PQ40033QGA25
Phone 1-888-567-9596
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Doc.# 005-2QG333D Rev. B
05/05/06
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
Min.
200 -2 2.4 2.4 -2
Typ.
225
Max.
250 0.8 18 18 0.8
Units
kHz V V V V V k % % % C C
Notes & Conditions
Regulation stage and Isolation stage
Switching Frequency ON/OFF Control (Option P) Off-State Voltage On-State Voltage ON/OFF Control (Option N) Off-State Voltage On-State Voltage ON/OFF Control (Either Option) Pull-Up Voltage Pull-Up Resistance Output Voltage Trim Range Output Voltage Remote Sense Range Output Over-Voltage Protection Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis Load Current Scale Factor Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF
-10 117
Vin/4.25 40 122 125 10 1500 2.5 1.6
17.7 +10 +10 127
Figures A & B Measured across Pins 8 & 4; Figures 27 & C Measured across Pins 8 & 4; Figure 27 Over full temp range; % of nominal Vout Average PCB Temperature
RELIABILITY CHARACTERISTICS
106 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta 106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter P
STANDARDS COMPLIANCE
Notes
File # E194341, Basic insulation & pollution degree 2 Certified by TUV Test on entire assembly; board & plastic components UL94V-0 compliant ESD test, 8kV - NP, 15kV air - NP (Normal Performance) Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950-1 EN60950-1 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 GR-1089-CORE 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
QUALIFICATION TESTING
# Units
32 5 5 10 5 5 5 15 pins
Test Conditions
10-55Hz sweep, 0.060" total excursion,1 min./sweep, 120 sweeps for 3 axis
Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability
95% rated Vin and load, units at derating point, 1000 hours
100g minimum, 2 drops in x and y axis, 1 drop in z axis -40C to 100C, unit temp. ramp 15C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10C to Tmax+10C, 5C steps, Vin = min to max, 0-105% load 85C, 85% RH, 1000 hours, 2 minutes on and 6 hours off 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 the factory for official product family qualification documents.
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 for information on available options.
Product # PQ40033QGA25 Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents, including but not limited to U.S. Patent #s 5,999,417; 6,222,742 B1; 6,594,159 B2; 6,545,890 B2.
Doc.# 005-2QG333D Rev. B 05/05/06 Page 4
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Technical Specification
95 90 85
91
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
90
Efficiency (%)
80 75 70 24 Vin 65 60 0 5 10 15 20 25 48 Vin 75 Vin
Efficiency (%)
89
88
87
86
25 C 40 C 55 C
0 100 200 300 400 500
85
Load Current (A)
Air Flow (LFM)
Figure 1: Efficiency at nominal output voltage vs. load current for 24V, 48V and 75V input at 25C.
Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25C, 40C, and 55C (48V input).
8
14 12
Power Dissipation (W)
Power Dissipation (W)
10 8 6 4 2 0 0 5 10 15 20 25
7
6
24 Vin 48 Vin 75 Vin
5
25 C 40 C 55 C 0 100 200 300 400 500
4 Air Flow (LFM)
Load Current (A)
Figure 3: Power dissipation at nominal output voltage vs. load current for 24V, 48V and 75V input at 25C.
Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25C, 40C, and 55C (48V input).
25
20
Iout (A)
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) 50 LFM (0.25 m/s)
0 0 25 40 55 70 85
Ambient Air Temperature (oC)
Semiconductor junction temperature is within 1C of surface temperature
Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing across the converter from pin 3 to pin 1 (24V input).
Product # PQ40033QGA25 Phone 1-888-567-9596
Figure 6: Thermal plot of converter at 25 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 3 to pin 1 (24V input).
Doc.# 005-2QG333D Rev. B 05/05/06 Page 5
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Technical Specification
25
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
20
Iout (A)
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) 50 LFM (0.25 m/s)
0 0 25 40 55
o
70
85
Ambient Air Temperature ( C)
Semiconductor junction temperature is within 1C of surface temperature
Figure 7: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing from pin 3 to pin 1 (48V input).
25
Figure 8: Thermal plot of converter at 25 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 3 to pin 1 (48V input).
20
Iout (A)
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) 50 LFM (0.25 m/s)
0 0 25 40 55 70 85
Ambient Air Temperature (oC)
Semiconductor junction temperature is within 1C of surface temperature
Figure 9: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing from input to output (24V input).
25
Figure 10: Thermal plot of converter at 24 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (24V input).
20
Iout (A)
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) 50 LFM (0.25 m/s)
0 0 25 40 55 70 85
Ambient Air Temperature (oC)
Semiconductor junction temperature is within 1C of surface temperature
Figure 11: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 50 LFM through 400 LFM with air flowing from input to output (48V input).
Product # PQ40033QGA25 Phone 1-888-567-9596
Figure 12: Thermal plot of converter at 24 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (48V input).
Doc.# 005-2QG333D Rev. B 05/05/06 Page 6
www.synqor.com
Technical Specification
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
Figure 13: Turn-on transient at full load (resistive load) (5 ms/div). Input voltage pre-applied. Ch 1: Vout (2V/div). Ch 2: ON/OFF input (5V/div)
Figure 14: Turn-on transient at zero load (5 ms/div). Ch 1: Vout (2V/div). Ch 2: ON/OFF input (5V/div).
Figure 15: Output voltage response to step-change in load current (50%75%-50% of Iout(max); dI/dt = 0.1A/s). Load cap: 10F, 100 m ESR tantalum cap and 1F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
Figure 16: Output voltage response to step-change in load current (50%75%-50% of Iout(max): dI/dt = 5A/s). Load cap: 470F, 30 m ESR tantalum cap and 1F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
See Fig. 19
source impedance
10 H
See Fig. 18 See Fig. 20
iS
VSOURCE
iC
DC/DC Converter 1 F
VOUT
10 F,
electrolytic capacitor
47 F, <1 ESR
ceramic 100m ESR capacitor tantalum capacitor
Figure 17: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 18), Input Reflected Ripple Current (Figure 19) and Output Voltage Ripple (Figure 20).
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Figure 18: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10H source impedance and 47F electrolytic capacitor (200 mA/div). See Figure 17.
Doc.# 005-2QG333D Rev. B 05/05/06 Page 7
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Technical Specification
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
Figure 19: Input reflected ripple current, is, through a 10 H source inductor at nominal input voltage and rated load current (20 mA/div). See Figure 17.
Figure 20: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 1F ceramic capacitor and 10F tantalum capacitor. Bandwidth: 20 MHz. See Figure 17.
4.0 3.5
Output Voltage (V)
3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 5 10 15
Load Current (A)
24 V 48 V 75 V 20 25 30
Figure 21: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
Figure 22: Load current (20A/div) as a function of time when the converter attempts to turn on into a 10 m short circuit. Top trace (5ms/div) is an expansion of the on-time portion of the bottom trace.
-20 -30
Forward Transmission (dB)
0.1
Output Impedance ( )
-40 -50 -60 -70 -80 -90 -100
19 Vin 48 Vin 75 Vin
0.01
19 Vin 48 Vin 75 Vin
0.001
0.0001 10 100 1,000 10,000 100,000
-110 10 100 1,000 10,000 100,000
Hz
Hz
Figure 23: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power.
Product # PQ40033QGA25 Phone 1-888-567-9596
Figure 24: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power.
Doc.# 005-2QG333D Rev. B 05/05/06 Page 8
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Technical Specification
0 -5
Reverse Transmission (dB)
Input: Output: Current: Package:
100
18-75 V 3.3 V 25 A Quarter-brick
-10 -15 -20
19 Vin Input Impedance ( )
10
19 Vin 48 Vin 75 Vin
-25 -30 -35 -40 -45 -50 10 100 1,000 10,000 100,000
48 Vin 75 Vin
1
0.1 10 100
Hz
1,000 Hz
10,000
100,000
Figure 25: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power.
Figure 26: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power.
10 9 8
Vout Trim-up (%)
7 6 5 4 3 2 1 0 23.0 22.5 22.0 21.5 21.0 20.5 20.0 19.5 19.0 18.5 18.0
+80 C +25 C -40 C
Input Voltage (V)
Figure 27: Achieveable trim-up percentage vs. input voltage at +85oC, +25oC and -40oC (all at full load). Full trim-up percentage is achieved at loads of 50% or less across full temperature and input voltage range.
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Doc.# 005-2QG333D Rev. B
05/05/06
Page 9
Technical Specification
BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power conversion topology. The first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions 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 frequency 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 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. 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 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. The PowerQor series of half-brick and quarter-brick converters uses the industry standard footprint and pin-out configuration.
Input: Output: Current: Package:
CONTROL FEATURES
18-75 V 3.3 V 25 A Quarter-brick
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 internal ON/OFF circuitry. 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. Pin 7 should be connected to Vout(+) and Pin 5 should be connected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is
[Vout(+) - Vout(-)] - [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 7 and 5 must be connected for proper regulation of the output 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 across the output (pins 8 and 4) to determine when it should trig-
ON/OFF
ON/OFF
ON/OFF
Vin(_) Remote Enable Circuit
Vin(_) Negative Logic (Permanently Enabled) ON/OFF
TTL/ CMOS
Vin(_) Positive Logic (Permanently Enabled)
Vin(+)
162k ON/OFF 50k
5V
5V ON/OFF
TTL
100pF 50k
Vin(_) Open Collector Enable Circuit
Vin(_) Direct Logic Drive
Vin(_)
Figure A: Various circuits for driving the ON/OFF pin.
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Figure B: Internal ON/OFF pin circuitry
Doc.# 005-2QG333D Rev. B 05/05/06 Page 10
Technical Specification
ger, not the voltage across the converter's sense leads (pins 7 and 5). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. To decrease the output voltage, the user should connect a resistor between Pin 6 and Pin 5 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
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 application note titled "Input System Instability" on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical "TurnOn Voltage Threshold" value* before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the impedance of the short across the output is small enough to make the output voltage drop below the specified Output DC Current-Limit Shutdown Voltage*, the converter turns off. The converter then enters a "hiccup mode" where it repeatedly turns on and off at a 5 Hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. This prevents excessive heating of the converter or the load board. Output Over-Voltage Limit: If the voltage across the output pins exceeds the "Output Over-Voltage Protection" threshold*, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. Load capacitance determines exactly how high the output voltage will rise in response to these conditions. After 200 ms the converter will automatically restart. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the OverTemperature 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. * See Electrical Characteristics page.
Doc.# 005-2QG333D Rev. B 05/05/06 Page 11
Rtrim-down =
where
(511) - 10.22 %
(k)
% =
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
Rtrim-up =
where
(
5.11VOUT(100+%) _ 511 _ 10.22
1.225%
%
)
(k)
VOUT = Nominal Output Voltage 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
Trim Resistance (kOhms)
1,000
100
10 0 1 2 3 4 5 6 7 8 9 10
% 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 circuit to engage, particularly during transients.
Product # PQ40033QGA25 Phone 1-888-567-9596
www.synqor.com
Technical Specification
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 website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure D provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Capacitance: Figure E 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 capacitance is specified in the Input Characteristics section on the Electrical Specifications page. More detailed information is available in the application note titled "EMI Characteristics" on the SynQor website.
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
Vin(+) External Input Filter
Electrolytic Capacitor
Vout(+) Vsense(+) Rtrim-up
or
Vin
47F
ON/OFF
Trim
Vsense(_) Vin(_) Vout(_)
Rtrim-down
Cload
Iload
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+) C Vin(_)
Figure E: Internal Input Filter Diagram (component values listed on the specifications page).
* See Electrical Characteristics page.
Product # PQ40033QGA25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG333D Rev. B 05/05/06 Page 12
Technical Specification
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
Input: Output: Current: Package:
18-75 V 3.3 V 25 A Quarter-brick
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.
Vin
Under-Voltage Lockout Turn-On Threshold
ON/OFF
(pos logic)
ON
OFF ON
OFF
ON
12ms (typical
Vout
turn on time)
200ms
(typical start-up inhibit period)
200ms
200ms
t0
t1
t2
t
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ40033QGA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2QG333D Rev. B
05/05/06
Page 13
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's PowerQor DC/DC converters follows the format shown in the example below.
PQ 40 033 Q G A 25 N N S Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
Model Number
Input: Output: Current: Package:
ORDERING INFORMATION
18-75 V 3.3 V 25 A Quarter-brick
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.
Input Voltage 18 - 75 V 18 - 75 V Output Max Output Voltage Current 3.3 V 25 A 5.0 V 20 A
PQ40033QGA25xyz PQ40050QGA25xyz
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 Length Feature Set
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 indicates 6/6 RoHS compliance.
K - 0.110" P - Positive N - 0.145" S - Standard N - Negative R - 0.180" Y - 0.250"
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:
Phone: Toll Free: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA
Phone 1-888-567-9596
Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website 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.
Doc.# 005-2QG333D Rev. B 05/05/06 Page 14
Product # PQ40033QGA25
www.synqor.com

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