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Technical Specification
Brick
Half
48Vin 5.0Vout 25A
25 Amp, No Heatsink, Isolated DC/DC Converter
The PQ48050HMA25 PowerQorTM Mega 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. The Mega series converters offer increased useable output current for a standard "half-brick" module. The Mega units also feature active current sharing for N+1 and parallel applications.
PQ48050HMA25 Module
Operational Features
* Ultra-high efficiency, 90% at full rated load current * Delivers up to 25 amps of output current with minimal derating - no heatsink required * Wide input voltage range: 35V - 75V meets or exceeds all 48V bus standards * Fixed frequency switching provides predictable EMI performance
Protection Features
* Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages * Output current limit and short circuit protection * Output over-voltage protection * Thermal shutdown
Mechanical Features
* Industry standard pin-out configuration * Industry standard size: 2.3" x 2.4" * Total height only 0.40", permits better airflow and smaller card pitch * Total weight: 1.9 oz. (54 grams)
Control 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
Safety Features
* 2000V, 10 M input-to-output isolation * UL/cUL 60950 recognized (US & Canada), basic insulation rating * TUV certified to EN60950 * Meets 72/23/EEC and 93/68/EEC directives * Meets UL94V-0 flammability requirements
Product # PQ48050HMA25 Phone 1-888-567-9596
Optional Features (Full-Feature modules) * Active current share for N+1 and parallel applications * External Clock Synchronization pin for better EMI characteristics * Startup Synchronization pin for more consistent startup sequence * ORing FET drive supply for efficient ORing protection
Doc.# 005-2HM450B Rev. C 4/9/03 Page 1
Technical Specification
Brick MECHANICAL DIAGRAM
2.30 0.19
(4.8)
Half
48Vin 5.0Vout 25A
1.90
(48.3)
(58.4)
0.50
(12.7)
0.300 (7.62) 0.400
(10.16)
0.400
(10.16)
0.700
(17.78)
1.000
(25.40)
0.200 (5.08)
1.400
(35.56)
Top View
0.200 (5.08)
1.000
(25.40)
2.40
(61.0)
1.400
(35.56)
Max. Height Bottom side Clearance
See Note 10
0.40
(10.2)
0.034+/-0.026
(0.86+/-0.66)
Side View
Lowest Component Load Board 0.145
(3.68) See Note 4
NOTES
1) Pins 1-4, 6-8, A-C are 0.040" (1.02mm) diameter. with 0.080" (2.03mm) diameter standoff shoulders. 2) Pins 5 and 9 are 0.080" (2.03 mm) diameter with 0.125" (3.18mm) diameter standoff shoulders. 3) Pins 3, A, B & C only included in Full-Feature models. 4) Other pin extension lengths available. Recommended pin length is 0.03" (0.76mm) greater than the PCB thickness. 5) All Pins: Material - Copper Alloy Finish - Tin/Lead over Nickel plate 6) Undimensioned components are shown for visual reference only. 7) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 8) Weight: 1.9 oz. (54g) typical 9) Workmanship: Meets or exceeds IPC-A-610C Class II 10) UL/TUV standards require a clearance greater than 0.04"
(1.02mm) between input and output for Basic insulation. This issue should be considered if any copper traces are on the top side of the user's board. Note that the ferrite cores are considered part of the input/primary circuit.
PIN CONNECTIONS
Pin No. Name
1 2 Vin(+) ON/OFF
Function
Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up.
3 4 5 6 7 8 9 A B C
I share Vin(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+) Clock Sync Start Sync OR Drive
Single wire parallel signal Negative input voltage Negative output voltage Return remote sense Output voltage trim Positive remote sense Positive output voltage Clock synchronization Startup synchronization External OR-FET drive
Pins in Italics Shaded text are Optional
Product # PQ48050HMA25
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Doc.# 005-2HM450B Rev. C
4/9/03
Page 2
Technical Specification
Brick PQ48050HMA25 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Half
48Vin 5.0Vout 25A
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 18 48 33.3 31.0 2.3 78.3 75 2 0.03 TBD 3 33 4.95 1.6\4\3.3 47 5.00 75 34.4 32.4 2.4 79.5 4.1 95 5
Units
V V V V C C V V V V V V V A mA mA A 2s mV mA A F\H\F F V %\mV %\mV mV V mV mV A A V % A mA F dB mV mV s
Notes & Conditions
continuous continuous < 10s Basic insulation level, 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 Voltage at Clock Sync pin
-40 -55 -2 -15 35 31.5 29.5 2.2 76.7
applies to Full Feature option only
INPUT CHARACTERISTICS
Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Input Over-Voltage Shutdown Maximum Input Current No-Load Input Current Disabled Input Current Inrush Current Transient Rating Response to Input Transient Input Reflected-Ripple Current Recommended Input Fuse Input Filter Component Values (C1\L\C2) 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 Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage Current Share Accuracy (2 units paralleled) 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 Step Change in Output Current (0.1A/s) Step Change in Output Current (5A/s) Settling Time Turn-On Transient Turn-On Time Start-Up Inhibit Time Output Voltage Overshoot 100% Load 50% Load Semiconductor Junction Temperature Board Temperature Transformer Temperature Isolation Voltage Isolation Resistance Isolation Capacitance
100% Load, 35 Vin
20
see Figure 13
1000V/ms input transient RMS thru 10H inductor; Figs. 13 & 15 fast blow external fuse recommended internal values, see Figure E
OUTPUT CHARACTERISTICS
5.05
4.91
+0.05 \ 3 +0.1 \ 5 +0.1 \ 5 +0.2 \ 10 +15 +30 5.10 50 10 28 2.9 +2 1.0 10 80 150 150 300 100 20 25 30 +5 2.0 50 50,000
0 26 0.5 0
over sample, line, load, temperature & life 20MHz bandwidth; Fig. 13 & 16 Full Load, see Figures 13 & 16 Full Load, see Figures 13 & 16 Output Voltage 10% Low; Fig. 17 % of rated output current Max negative current drawn from output Max negative current drawn from output 5.0Vout at 25A Resistive Load 120 Hz; Fig. 20 50% to 75% to 50% Iout max; Figure 11 50% to 75% to 50% Iout max; Figure 12 to within 1% Vout nom Full load, Vout=90% nom.; Figs. 9 & 10 -40C to +125C; Figure A 10,000 F load capacitance, Iout = 0A Figures 1 - 4 Figures 1 - 4 Package rated to 150C UL rated max operating temp 130C See Figures 5 - 8 for derating curves
DYNAMIC CHARACTERISTICS
180
20 200 0 90 91
30 215
ms ms % % %
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
125 125 125 2000 10 3300
C C C V M pF
ISOLATION CHARACTERISTICS
Product # PQ48050HMA25
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Doc.# 005-2HM450B Rev. C
4/9/03
Page 3
Technical Specification
Brick ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Half
48Vin 5.0Vout 25A
Units
kHz V V V V V k % % % C C
Min.
205 -2 2.7 2.7 -2
Typ.
230
Max.
255 0.8 18 18 0.8
Notes & Conditions
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 Calculated MTBF Calculated MTBF Demonstrated MTBF
-20 114
Vin/6 42 120 120 10 2.3 1.7 >20
15 +13 +13 127
Figures A, B Measured across Pins 9 & 5; Figure C Measured across Pins 9 & 5 Over full temp range; % of nominal Vout Average PCB Temperature
RELIABILITY CHARACTERISTICS
106 Hrs. Telcordia TR-NWT-000332; 80% load,300LFM, 40oC Ta 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta 106 Hrs. Field demonstrated MTBF
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 Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950 EN60950 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 GR-1089-CORE
* An external input fuse must always be used to meet these safety requirements
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 factory for more information about Proof of Design and Proof of Manufacturing processes.
OPTIONS
SynQor provides various options for Logic Sense, Pin Length and Feature Set for this family of DC/DC converters. Please consult the last page of this specification sheet for information on available options.
Product # PQ48050HMA25 Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417.
Doc.# 005-2HM450B Rev. C
4/9/03
Page 4
Performance Curves
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100 95 90
Half
94 93
48Vin 5.0Vout 25A
Efficiency (%)
85 80 75 70 65 60 0 3 5 8 10 13 15 18 20 23 25 36 Vin 48 Vin 75 Vin
Efficiency (%)
92 91 90 89 88 0 100 200 300 400
Air Flow (LFM) 25 C 40 C 55 C
500
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage 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 (nominal input voltage).
12.0 11.0
Power Dissipation (W)
18 16
Power Dissipation (W)
14 12 10 8 6 4 2 0 0 3 5 8 10 13 15 18 20
10.0 9.0 8.0 7.0 6.0 5.0 4.0
25 C 40 C 55 C
36 Vin 48 Vin 75 Vin
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 for minimum, nominal, and maximum input voltage 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 (nominal input voltage).
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) 0 LFM (0 m/s)
0 0
25
40
55
70
85
Ambient Air Temperature (oC)
Figure 5: Maximum output power derating curves vs. ambient air temperature for airflow rates of 0 LFM through 400 LFM with air flowing from input to output (nominal input voltage).
Product # PQ48050HMA25 Phone 1-888-567-9596
Figure 6: Thermal plot of converter at 23 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (nominal input voltage).
Doc.# 005-2HM450B Rev. C 4/9/03 Page 5
Semiconductor junction temperature is within 1C of surface temperature
Performance Curves
Brick
25
Half
48Vin 5.0Vout 25A
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) 0 LFM (0 m/s)
0 0 25 40 55
o
70
85
Ambient Air Temperature ( C)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 0 LFM through 400 LFM with air flowing from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 20 amp load current with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from output to input (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (10 ms/div). Top Trace: Vout (2V/div) Bottom Trace: ON/OFF input (5V/div)
Figure 10: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (2V/div) Bottom Trace: ON/OFF input (5V/div)
Figure 11: Output voltage response to step-change in load current (50%-75%-50%
of Iout(max); dI/dt = 0.1A/s). Load cap: 15F, 450 m ESR tantalum capacitor and 1F ceramic capacitor. Top trace: Vout (200mV/div), Bottom trace: Iout (10A/div). Product # PQ48050HMA25 Phone 1-888-567-9596
Figure 12: Output voltage response to step-change in load current (50%-75%-50% of Iout(max): dI/dt = 5A/s). Load cap: 480F, 15 m ESR tantalum capacitor and 1F ceramic capacitor. Top trace: Vout (200mV/div), Bottom trace: Iout (10A/div).
Doc.# 005-2HM450B Rev. C 4/9/03 Page 6
Semiconductor junction temperature is within 1C of surface temperature
Performance Curves
Brick
Figure 15 10 H
Half
48Vin 5.0Vout 25A
source impedance
Figure 14 Figure 16
iS
VSOURCE
iC
DC/DC Converter 1 F
VOUT
15 F,
47 F, <1 ESR
electrolytic capacitor
ceramic 450m ESR capacitor tantalum 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, ic, at full rated output current and nominal input voltage with 10H source impedance and 47F electrolytic capacitor (100 mA/div). (See Figure 13)
Figure 15: Input reflected ripple current, is, through a 10 H source inductor at nominal input voltage and rated load current (5 mA/div). (See Figure 13)
7.0 6.0 Output Voltage (V) 5.0 4.0 3.0 2.0 1.0 0.0 0 4 8 12 16 20 24 28 32 Load Current (A) 36 V 48 V 75 V
Figure 16: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 1F ceramic capacitor and 15F tantalum capacitor. Bandwidth: 20 MHz. (See Figure 13)
Figure 17: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
Product # PQ48050HMA25 Phone 1-888-567-9596
Figure 18: Load current (10A/div) as a function of time when the converter attempts to turn on into a 1 m short circuit. Top trace (2ms/div) is an expansion of the on-time portion of the bottom trace.
Doc.# 005-2HM450B Rev. C 4/9/03 Page 7
Performance Curves
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1
0 -10
Forward Transmission (dB)
Half
48Vin 5.0Vout 25A
-20 -30 -40 -50 -60 -70 -80 -90 36 Vin 48 Vin 75 Vin
Output Impedance ( )
0.1
0.01
36 Vin 48 Vin 75 Vin
0.001
0.0001 10 100 1,000 10,000 100,000
-100 10 100 1,000 10,000 100,000
Hz
Hz
Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power.
0 -10
Reverse Transmission (dB)
Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power.
100
Input Impedance ( )
-20 -30 -40 -50 -60 10 100 1,000 10,000 100,000 36 Vin 48 Vin 75 Vin
10 36 Vin 48 Vin 75 Vin 1
0.1 10 100 1,000 Hz 10,000 100,000
Hz
Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power.
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Doc.# 005-2HM450B Rev. C
4/9/03
Page 8
Technical Specification
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BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power circuit 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 onstate 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.
Half
48Vin 5.0Vout 25A
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure A details five possible circuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter's output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 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(-)] - [SENSE(+) - SENSE(-)] <
Sense Range % x Vout
Pins 8 and 6 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 lower than its specified value.
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(+)
274k 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.# 005-2HM450B Rev. C 4/9/03 Page 9
Technical Specification
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Note: the output over-voltage protection circuit senses the voltage across the sense leads (pins 8 and 6) to determine when it should trigger, not the voltage across the converter's output pins (pins 9 and 5). OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. To decrease the output voltage, the user should connect a resistor between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be
Half
48Vin 5.0Vout 25A
output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. It is not necessary for the user to add capacitance at the Trim pin. The node is internally bypassed to eliminate noise. Total DC Variation of Vout: For the converter to meet its full specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range.
Rtrim-down =
where
(100%) - 2 k
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". The lockout circuitry is a comparator with DC hysteresis. When the input voltage 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 voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Input Over-Voltage Shutdown: Available on PQ48 models only. The converter turns off when the input voltage is too high, allowing the converter to withstand an input voltage as high as 100V without destruction. The shutdown circuitry is a comparator with DC hysteresis. When the input voltage exceeds the typical Input Over-Voltage Shutdown value, the converter will turn off. Once the converter is off, it will turn back on when the input voltage falls below the minimum Input OverVoltage Shutdown value. 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 CurrentLimit 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.
% =
(Vnominal - Vdesired) x 100% Vnominal
To increase the output voltage, the user should connect a resistor between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be
Rtrim-up =
(Vnominal - 2) x VDES + VNOM 1.225
VDES - VNOM
k
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
1 0 2 4 6 8 10 12 14 16 18 20
% Increase in Vout
% Decrease in Vout
Figure C: Trim Graph for 5.0Vout module
Note: the TRIM feature does not affect the voltage at which the
Product # PQ48050HMA25 Phone 1-888-567-9596
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)
Doc.# 005-2HM450B Rev. C 4/9/03 Page 10
Technical Specification
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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. ming. Input Filtering and External Capacitance: Figure E below provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is specified in the "Input Characterisitcs" section. More detailed information is available in the application note titled "EMI Characteristics" on the SynQor website.
Half
48Vin 5.0Vout 25A
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 correcting it. Application Circuits: Figure D below provides a typical circuit diagram which details the input filtering and voltage trim-
Electrolytic Capacitor
Vin(+)
Vout(+) Vsense(+) Rtrim-up
or
Vin
External Input Filter
33F ESR 1
ON/OFF
Trim
Vsense(_) Vin(_) Vout(_)
Rtrim-down
Cload
Iload
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+) C1 Vin(_) C2
Figure E: Internal Input Filter Diagram (component values listed on page 3).
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Technical Specification
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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 converter from overheating. In all, there are seven ways that the converter can be shut down, initiating a Startup Inhibit Period: * Input Under-Voltage Lockout * Input Over-Voltage Shutdown (not present in Quarter-brick) * Output Over-Voltage Protection * Over Temperature Shutdown * Current Limit * Short Circuit Protection * Turned off by the ON/OFF input Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Before time t0, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a Startup Inhibit Period is initiated. At the end of this delay, the ON/OFF pin is evaluated, and since it is active, the unit turns on. At time t1, the unit is disabled by the ON/OFF pin, and it cannot be enabled again until the Startup Inhibit Period has elapsed.
Vin
Under-Voltage Lockout Turn-On Threshold
Half
48Vin 5.0Vout 25A
When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-On Time.
FULL FEATURE APPLICATION NOTES
This section provides some basic application information for the full-feature version of the PowerQor series converter. The pin-out configuration for these optional feature pins is shown on page 2, and the part numbering format is shown on the last page of this specification sheet. All units in this product family include back-drive protection to simplify the use of multiple converters in a parallel or sequencing application. However, any voltage applied to the output of the converter should be kept below 120% of the rated output voltage of the converter. In addition to back-drive protection, these units include the following features (pins): Current Share (pin 3): The active current share feature allows for N+1 and parallel applications. To achieve load sharing, directly connect the I share pins of multiple units. The load current will share equally among the multiple units (5% at full rated current). It is important that the Vin(-) pins of the sharing units be directly connected and NOT placed outside of an EMI filter or other impedance path. The voltage at the I Share pin will range from 0 to 5 volts (at full rated current), referenced to
ON/OFF
(pos logic)
ON
OFF ON
OFF
ON
20ms (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 # PQ48050HMA25 Phone 1-888-567-9596 Doc.# 005-2HM450B Rev. C 4/9/03 Page 12
Technical Specification
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the primary-side ground, Vin(-). Start Sync (pin B): The Start Synchronization pin will allow a more consistent start-up sequence. To operate this feature, connect together the Start-Sync pins of multiple current-sharing units. This will permit immediate start-up with loads greater than the current limit of a single unit. Without this connection, any set of converters attempting to asynchronously start (or re-start) with a load greater than the current limit of a single unit will "hiccup". This "hiccup" mode will continue until one converter attempts a start at the same time as the minimum number of additional units necessary to sustain the load condition. For example, three 50 amp units starting into a 90 amp load would require two units to simultaneously attempt a start. The Start Sync connection synchronizes these starting attempts and provides a more consistent and reliable start-up sequence. For details about the "hiccup mode" or repeated startup attempts, please see the "Startup Inhibit Period" note in this Technical Specification. Clock Sync (pin A): The External Clock Synchronization pin provides the ability for the user to control the EMI signature and synchronize sensitive circuitry to quiet periods in the converter operation. With this option, the converter can be synchronized to an external clock signal whose frequency is greater than that of the free-running internal clock. However, substantially raising the converter's frequency will reduce its efficiency. Therefore, the recommended frequency range for the external clock synchronization signal applied to this pin would be the lowest value possible without dropping below the minimum frequencies listed below: 275 KHz for the 1.5V and 3.3V units 225 KHz for the 1.8V and 2.0V units 255 KHz for the 2.5V, 5V, 12V and 15V units The following requirements should also be met: * The external clock signal should be referenced to the negative input voltage, Vin(-). * The high level of the signal should be between 3.5V and 5.0V. * The low level should be between -0.5V and +1.2V. * Do not apply a clock signal lower than the specified frequency. OR Drive (pin C): This pin provides a signal which can be used to drive an OR-ing FET and/or an auxiliary external control circuitry. This pin may also be used as a basic "PowerProduct # PQ48050HMA25 Phone 1-888-567-9596 Doc.# 005-2HM450B Rev. C 4/9/03 Page 13
Half
48Vin 5.0Vout 25A
Good" signal. This pin is referenced to the secondary-side ground, Vsense(-). The voltage at this pin tracks the output voltage but has a value several times higher. For example, during normal operation the OR Drive voltage is at least high enough to fully gate on a standard MOSFET, whose source voltage is equal to the output voltage of the converter. With nominal output voltage, the OR Drive signals are listed in the table below for each output voltage. An internal 2.7 K source resistance will limit the current drawn from this pin. However, the user is responsible for the overvoltage protection of the MOSFET or other external circuitry driven by this voltage. It is recommended that the user include a zener diode between the gate and source of the external MOSFET(s) driven by the OR Drive pin. For more information, refer to the Full Feature Application Note found on the SynQor web site (www.synqor.com).
OR-Drive Voltages
Vout 1.2 1.5 1.8 2.0 2.5 3.3 5.0 12 15 No Load TBD 9 11 11 13 13 19 24 26 Full Load TBD 12 14 16 21 16 20 26 28
Technical Specification
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PART NUMBERING SYSTEM
The part numbering system for SynQor's PowerQor DC/DC converters follows the format shown in the example below.
PQ 48 050 H M A 25 N K S Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
Model Number PQ48015HMA30xyz PQ48018HMA30xyz PQ48020HMA30xyz PQ48025HMA30xyz PQ48033HMA30xyz PQ48050HMA25xyz Input Voltage 35 - 75 V 35 - 75 V 35 - 75 V 35 - 75 V 35 - 75 V 35 - 75 V Output Max Output Voltage Current 1.5 V 30 A 1.8 V 30 A 2.0 V 30 A 2.5 V 30 A 3.3 V 30 A 5.0 V 25 A
Half
48Vin 5.0Vout 25A
ORDERING INFORMATION
The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options.
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.
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
Pin Length K - 0.110" P - Positive N - 0.145" N - Negative R - 0.180" Y - 0.250" Enable Logic Feature Set S - Standard F - Full Feature
Application Notes
A variety of application notes and technical white papers can be downloaded in pdf format at www.synqor.com.
Contact SynQor for further information:
Phone: Toll Free: Fax: E-mail: Web: Address:
508-485-8434 888-567-9596 508-485-8414 sales@synqor.com www.synqor.com 188 Central Street Hudson, MA 01749
Phone 1-888-567-9596
Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our web site or is available upon request from SynQor.
Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor. Doc.# 005-2HM450B Rev. C 4/9/03 Page 14
Product # PQ48050HMA25

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