PQ24018QGA25

PQ24018QGA25 SYNQOR | Alldatasheet

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Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 1 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick The PQ24018QGA25 PowerQor™ Giga quarter- brick converter is a next-generation, board-mount- able, isolated, fixed switching frequency dc/dc converter that uses synchronous rectification to achieve extremely high conversion efficiency. The power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. All of the power and control components are mounted to the multi-layer PCB substrate with high-yield surface mount technolo- gy. Since the PowerQor converter has no explicit thermal connections, it is extremely reliable. PQ24018QGA25 Module

25 Amp, No Heatsink, Isolated DC/DC Converter

• Industry standard quarter-brick pin-out configuration  Industry standard size: 1.45” x 2.3”  Total height less than 0.40”, permits better airflow and smaller card pitch  Total weight: 34 grams (1.2 oz.), lower mass great- ly reduces vibration and shock problems Operational Features  High efficiency, >84% at full rated load current  Delivers up to 25 amps of output current with mini- mal derating - no heatsink required  Wide input voltage range: 18V – 36V meets or exceeds all 24V bus standards  Fixed frequency switching provides predictable EMI performance  No minimum load requirement means no preload resistors required Protection Features  Input under-voltage lockout disables converter at low input voltage conditions  Output current limit and short circuit protection protects converter from excessive load current or short circuits  Output over-voltage protection protects load from damaging voltages  Thermal shutdown protects converter from abnor- mal environmental conditions Safety Features  2000V, 10 M Ω input-to-output isolation provides input/output ground separation  UL 1950 recognized (US & Canada), basic insula- tion rating (pending)  TUV certification to EN60950 (pending)  Meets 72/23/EEC and 93/68/EEC directives which facilitates CE Marking in user’s end product  Board and plastic components meet 94V-0 flamma- bility requirements  NEBS and ETSI compliant 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

Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 2 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick Shown Actual Size Pin No. Name Function

1 Vin(+) Positive input voltage (18 - 36V)

2 ON/OFF TTL input to turn converter

on and off, referenced to Vin(-), with internal pull up.

3 Vin(-) Negative input voltage

4 Vout(-) Negative output voltage

5 SENSE(-) Negative remote sense 1

6 TRIM Output voltage trim 2

7 SENSE(+) Positive remote sense 3

8 Vout(+) Positive output voltage

Notes: 1. Pin 5 should be connected to Vout(-) at load. 2. Leave Pin 6 open for nominal output voltage. 3. Pin 7 should be connected to Vout(+) at load. ABSOLUTE MAXIMUM RATINGS Input Voltage: Non-Operating: 72V continuous Operating: 60V continuous Input/Output Isolation V oltage: 2000V Storage Temperature: -55°C to +125°C Operating Temperature: -40°C to +115°C Voltage at ON/OFF input pin: +18V / -2V OPTIONS  Logic sense - Negative (N); converter is on when the ON/OFF signal is low. Positive (P); converter is on when the ON/OFF signal is high. Logic input is TTL compatible with an internal pull up. Use N or P as 13th letter in part number to indicate logic.  Pin Length - a variety of pin lengths are available for all modules (see last page). The14th letter in the part number indicates pin length.  Feature Set - Quarter-bricks are available with Standard (S) feature options only. Use S as 15th letter in part number to indicate feature set. SAFETY  UL 1950 - All modules are UL 1950 recognized (US & Canada) with basic insulation rating.  EN60950 - All modules are TUV certified to EN60950 requirements.  72/23/EEC - All modules meet 72/23/EEC directives.  93/68/EEC - All modules meet 93/68/EEC directives.  94V-0 - All modules meet 94V-0 flammability require- ments for board and plastic components.  NEBS - All modules meet NEBS compatibility.  An external input fuse must always be used to meet these safety requirements. 1) Pins 1-3, 5-7 are 0.040” (1.02mm) dia. with 0.080” (2.03mm) dia. standoff shoulders. 2) Pins 4 and 8 are 0.062” (1.57 mm) dia. with 0.100” (2.54mm) dia. standoff shoulders. 3) Other pin extension lengths available. 4) Undimensioned components are for visual reference only. 5) Weight: 1.2 oz. (34g) typical 6) All dimensions in inches (mm) 7) Workmanship: Meets or exceeds IPC-A-610B Class II 0.40 (10.2) 0.300 (7.62) 1.45 (36.8) 0.43 (10.9) 0.14 (3.6) 2.30 (58.4) 2.00 (50.8) 0.150 (3.81) 0.300 (7.62) 0.450 (11.43) 0.600 (15.24) 0.600 (15.24) Top View Side View 0.145 (3.68) See Note 3

Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 3 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick PARAMETER NOTES and CONDITIONS PQ24018QGA25 Min. Typ. Max. Units INPUT CHARACTERISTICS Operating Input Voltage Range 18 24 36 V Input Under-Voltage Lockout Turn-On Voltage Threshold 15.5 16.0 16.5 V Turn-Off Voltage Threshold 14.0 14.5 15.0 V Lockout Hysteresis Voltage 1.0 1.5 2.0 V Maximum Input Current 100% Load, 18Vin 3.0 A No-Load Input Current 60 100 mA Off Converter Input Current 1.6 3 mA Input Reflected-Ripple Current P-P thru 3.3 µH inductor; Figures 13 & 15 6 mA OUTPUT CHARACTERISTICS Output Voltage Set Point 1.782 1.800 1.816 V Output Voltage Regulation Over Line +0.1 (2) +0.3 (5) % (mV) Over Load +0.1 (2) +0.3 (5) % (mV) Over Temperature +9 +27 mV Total Output Voltage Range over sample line, load and temperature 1.75 1.85 V Output Voltage Ripple and Noise 20MHz bandwidth; Figures 13 & 16 Peak-to-Peak Full Load, 1 µF ceramic, 10µF tantalum 25 50 mV RMS Full Load, 1 µF ceramic, 10µF tantalum 61 2 m V Operating Output Current Range 02 5 A Output DC Current-Limit Inception Output Voltage 10% Low; Fig. 17 & 18 26 30 34 A Short-Circuit Protection (redundant shutdown) 52 56 60 A DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection 120 Hz; Figure 20 TBD dB Output Voltage Current Transient 470µF load cap, 5A/µs; Figure 12 Positive Step Change in Output Current 50% Io to 75% Io 190 mV Negative Step Change in Output Current 75% Io to 50% Io 190 mV Settling Time to within 1% Vout nominal 700 µs Turn-On Transient Turn-On Time Full load, Vout=90% nom.; Figs 9 & 10 1 4 8 ms Start-Up Inhibit Period -40°C to +125°C; Figure F 180 200 215 ms Maximum Output Capacitance Full load; 5% overshoot of V out at startup 35,000 µF EFFICIENCY 100% Load Figure 1 84 % 50% Load 87 % TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature Plastic Package rated to 150°C 125 °C Board Temperature Board rated to 165°C 125 °C Transformer Temperature Figures 5 - 8 125 °C ISOLATION CHARACTERISTICS Isolation Voltage 2000 V Isolation Resistance 10 M Ω Isolation Capacitance 470 pF FEATURE CHARACTERISTICS Switching Frequency 220 240 260 kHz ON/OFF Control (Option P) Off-State Voltage -2 0.8 V On-State Voltage 2.4 18 V ON/OFF Control (Option N) Off-State Voltage 2.4 18 V On-State Voltage -2 0.8 V ON/OFF Control (Either Option) Pull-Up Voltage See circuit diagram; Figure B Vin/3 9.6 V Pull-Up Resistance Pull up to Vin/3 33 k Ω Output Voltage Trim Range Across Pins 8 & 4; Figures C & D -20 +10 % Output Over-Voltage Protection Over full temp range; % of nominal Vout 117 122 127 % Over-Temperature Shutdown Average PCB Temperature 125 °C PQ24018QGA25 ELECTRICAL CHARACTERISTICS TA=25°C, airflow rate=300 LFM, V in=24Vdc, nominal Vout unless otherwise noted; full operating temperature range is -40°C to +115°C ambient temperature with appropriate power derating. Specifications subject to change without notice. Patents: SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417.

Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 4 Performance Curves 24Vin 1.8Vout 25AQuarterQuarter BrickBrick 0 3 5 8 10 13 15 18 20 23 25 Load Current (A) Efficiency (%) 18Vin 24Vin 36Vin Figure 1: Efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25 °C. 0 100 200 300 400 500 Air Flow (LFM) Efficiency (%) 25 C 40 C 55 C Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25 °C, 40°C, and 55 °C (nominal input voltage). 0 3 5 8 10 13 15 18 20 23 25 Load Current (A) Power Dissipation (W) 18Vin 24Vin 36Vin Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 °C. 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 100 200 300 400 500 Air Flow (LFM) Power Dissipation (W) 25 C 40 C 55 C Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25 °C, 40°C, and 55°C (nominal input voltage). 0 2 54 05 57 08 5 Ambient Air Temperature (oC) Iout (A) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)

0 LFM (0 m/s)

Figure 5: Maximum output power derating curves vs. ambient air tem- perature for airflow rates of 0 LFM through 400 LFM with air flowing across the converter from pin 1 to pin 3 (nominal input voltage). Figure 6: Thermal plot of converter at 25 amp load current with 55 °C air flowing at the rate of 200 LFM. Air is flowing across the converter sideways from pin 1 to pin 3 (nominal input voltage). Vin = 24V Semiconductor junction temperature is within 1°C of surface temperature

Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 5 Performance Curves 24Vin 1.8Vout 25A 0 2 54 05 57 08 5 Ambient Air Temperature (oC) Iout (A) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) Figure 7: Maximum output power derating curves vs. ambient air tem- perature for airflow rates of 0 LFM through 400 LFM with air flowing lengthwise from output to input (nominal input voltage). Figure 8: Thermal plot of converter at 25 amp load current with 55 °C air flowing at the rate of 200 LFM. Air is flowing across the converter from output to input (nominal input voltage). Figure 9: Turn-on transient at full load (resistive load) (2 ms/div). Ch1: Vout (500mV/div) Ch2: ON/OFF input (5V/div) Figure 10: Turn-on transient at zero load (2 ms/div). Ch1: Vout (500mV/div) Ch2: 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/µs). Load cap: 10µF , 100 mΩ ESR tantalum capacitor and 1µF ceramic capacitor. Ch1: Vout (100mV/div), Ch2: Iout (10A/div). Figure 12: Output voltage response to step-change in load current (50%-75%-50% of Iout(max): dI/dt = 5A/ µs). Load cap: 470 µF , 30 mΩ ESR tantalum capacitor and 1µF ceramic capacitor. Ch1: Vout (100mV/div), Ch2: Iout (10A/div). Semiconductor junction temperature is within 1°C of surface temperatureVin = 24V

Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 7 Performance Curves 24Vin 1.8Vout 25A 0.001 0.01 0.1 10 100 1,000 10,000 100,000 Hz Output Impedance (ΩΩ )

18 Vin

24 Vin

36 Vin

Figure 19: Magnitude of incremental output impedance (Z out = vout/iout) for minimum, nominal, and maximum input voltage at full rated power. -70 -60 -50 -40 -30 -20 -10 10 100 1,000 10,000 100,000 Hz Forward Transmission (dB) Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power. -60 -50 -40 -30 -20 -10 10 100 1,000 10,000 100,000 Hz Reverse Transmission (dB) Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power. 0.1 100 10 100 1,000 10,000 100,000 Hz Input Impedance (ΩΩ ) Figure 22: Magnitude of incremental input impedance (Z in = vin/iin) for minimum, nominal, and maximum input voltage at full rated power. QuarterQuarter BrickBrick

FEATURES

The PowerQor series converter uses a two-stage power cir- cuit 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 used in conventional dc/dc converters. 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 the PowerQor converter requires no heatsink to deliver a greater level of power than can be delivered by a con- ventional, Schottky-diode-based dc/dc converter with a 0.5” high heatsink. At equivalent ambient air temperature, airflow rate, and output power level, the hottest semicon- ductor junction temperature and the hottest PCB temperature within the PowerQor converter are cooler than those found in conventional dc/dc converters with a 0.5” high heatsink attached. 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 using high yield surface mount techniques on a PCB substrate. Unlike conventional dc/dc converters, which have critical thermal connections between the power components and the baseplate, and between the baseplate and the heatsink, the PowerQor converter has no explicit, failure-prone thermal connections. Compared to a conventional Schottky-diode-based dc/dc converter with a 0.5” high heatsink, the PowerQor convert- er is more efficient and therefore it dissipates less than half the energy. Additionally, because the PowerQor converter is thinner (0.4” vs. 1.0”), the board-to-board pitch in a rack can be much smaller, and cooling airflow is less impeded by the converter. Because the PowerQor converter is much lighter, vibration and shock-induced problems are greatly reduced. Moreover, due to the lack of failure-prone explicit thermal connections and the lack of potting material the PowerQor converter is more reliable than conventional dc/dc converters. The PowerQor series converter uses the industry standard pin-out configuration used by other vendors of comparably sized and rated dc/dc converters. The unit is pin for pin compatible with the Lucent QW series. The PowerQor converter has many standard control and protection features. All shutdown features are non-latching, meaning that the converter shuts off for 200ms before restarting. (see Figure F)  An ON/OFF input permits the user to control when the converter is on and off in order to properly sequence dif- ferent power supplies and to reduce power consumption during a standby condition.  Remote sense inputs permit the user to maintain an accurate voltage at the load despite distribution voltage drops between the converter’s output and the load.  An output voltage trim input permits the user to trim the output voltage up or down to achieve a custom volt- age level or to do voltage margining.  An input under-voltage lockout avoids input system instability problems while the input voltage is rising.  The output current limit protects both the converter and the board on which it is mounted against a short cir- cuit condition. (see Figure 18)  An output over-voltage limit circuit shuts the unit down if the output voltage at the output pins gets too high.  A sensor located in a central spot of the PCB provides a PCB temperature limit . If, due to an abnormal con- dition, this spot gets too hot, the converter will turn off. Once the converter has cooled, it will automatically turn on again without the need to recycle the input power. CONTROL PIN DESCRIPTIONS Pin 2 (ON/OFF ): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 8 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick

referenced to the return terminal of the 24V input bus. There are two versions of the PowerQor series converter that differ by the sense of the logic used for the ON/OFF input. In the PQxxyyyQGAzzPxx version, the ON/OFF input is active high (meaning that a high turns the converter on). In the PQxxyyyQGAzzNxx 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 shows detail of the internal ON/OFF circuitry. Pins 7 and 5 (SENSE(+ )): The SENSE(+ ) inputs correct for voltage drops along the conductors that connect the con- verter’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 regu- lation is desired. That is, [Vout(+) - Vout(-)] – [SENSE(+) - SENSE (-) ] < 10%Vout Pins 7 and 5 must be connected for proper regulation of the output voltage. However, if these connections are not made, nothing catastrophic will happen to the converter under nor- mal operating conditions—the converter will simply 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 trigger, not the voltage across the converter’s sense pins (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. Pin 6 (TRIM): The TRIM input permits the user to adjust the output voltage across the sense leads up or down. To lower the output voltage, the user should connect a resistor between Pin 6 and Pin 5, which is the SENSE(-) input. To raise the output voltage, the user should connect a resistor between Pin 6 and Pin 7, which is the SENSE(+) input. A resistor connected between Pin 6 and Pin 5 will decrease the output voltage. For a desired decrease of ∆ percent of the nominal output voltage, the value of this resistor should be Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 9 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick Open Collector Enable Circuit Figure A: Various circuits for driving the ON/OFF pin. Remote Enable Circuit Direct Logic Drive Negative Logic (Permanently Enabled) Positive Logic (Permanently Enabled) ON/OFF Vin(_) ON/OFF ON/OFF Vin(_) ON/OFF TTL/ CMOS Vin(_) ON/OFF Vin(_) Vin(_) Rtrim-down = ( 511 ) - 10.22∆% (kΩ) ∆ = ( VNOM – VDES )x 100% VNOM where VNOM = Nominal Voltage VDES = Desired Voltage and Figure B: Internal ON/OFF pin circuitry (detail) TTL 50k 100k Vin(+) ON/OFF Vin(_) 50k 100pF

Figure C graphs this relationship between R trim-down and ∆. The output voltage can be trimmed down as much as 20%. Figure C: Trim Down Graph for 1.8Vout A resistor connected between Pin 6 and Pin 7 will increase the output voltage. For a desired increase of ∆ percent of the nominal output voltage, the value of this resistor should be Figure D graphs this relationship between R trim-up and ∆. The output voltage can be trimmed up as much as 10%. Figure D: Trim Up Graph for 1.8Vout 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 trip, particularly during tran- sients. 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 +10%/-20% PROTECTION FEATURES Input Under-Voltage Lockout : The converter is designed to turn off when the input voltage is too low, help- ing avoid an input system instability problem, described in more detail below. The lockout circuitry is a comparator with dc hysteresis. When the input voltage is rising, it must exceed a typical value of 16V before the converter will turn on. Once the converter is on, the input voltage must fall below a typical value of 14.5V before the converter will turn off. Output Current Limit : The current limit does not change appreciably 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 approximately 60% of its nominal value, the converter turns off. The converter then enters a 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 pre- vents excessive heating of the converter or the load board. Output Over-Voltage Limit : If the voltage across the output pins exceeds the O.V. threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) a sudden unloading of the converter, 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. Thermal Shutdown : The PowerQor series has a temper- ature sensor located such that it senses the average temper- ature of the converter. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches 125°C. It will allow the con- Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 10 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % Decrease in Output Voltage Trim Resistance (kOhms) 100 1,000 10,000 0123456789 1 0 % Increase in Output Voltage Trim Resistance (kOhms) Rtrim-up (kΩ)) where VOUT = Nominal Output Voltage = ( _ 511 _ 10.22 5.11VOUT(100+∆%) 1.225∆% ∆%

verter to turn on again when the temperature of the sensed location falls below 115°C. APPLICATION CONSIDERATIONS Input System Instability : This condition can occur because a 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 solu- tion for correcting it. Application Circuits: Figure E below provides a typical circuit diagram which is useful when using input filtering and voltage trimming. Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 11 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick 18V < Vin< 36V Input Filtering Trim 3.3µH Vin(+) IloadCload Vout(+) Rtrim-up or Rtrim-down Vsense(+) ON/OFF Vin(_) Vout(_) Vsense(_) Electrolytic Capacitor 100µF ESR ≅0.33Ω Figure E: Typical application circuit (negative logic unit, permanently enabled).

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 over- heating. 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 t 0, t1, and t2: Before time t 0, when the input voltage is below 16V (typ.), the unit is disabled by the Input Under-Voltage Lockout fea- ture. When the input voltage rises above 16V, 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 t 1, 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 t 2, the Startup Inhibit Period has elapsed, and the output turns on within the 4ms (typ.) "Turn On Time." Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 12 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick Under-Voltage Lockout Turn-On Threshold ON/OFF (pos logic) Figure F: Startup Inhibit Period (turn-on time not to scale) Vout Vin 200ms 200ms 200ms (typical start-up inhibit period) t0 t1 t2 t 4ms (typical turn on time) ON ON ON OFF OFF

The part numbering system for SynQor’s PowerQor DC/DC converters follows the format shown in the example below. The first 12 characters comprise the base part number and the last 3 characters indicate available options. Although there are no default values for enable logic and pin length, the most common options are negative logic and 0.145” pins. These part numbers are more likely to be readily avail- able in stock for evaluation and prototype quantities.

ORDERING INFORMATION

The tables below show the valid model numbers and order- ing options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. The following option choices must be included in place of the x y z spaces in the model numbers listed above. Product # PQ24018QGA25 Phone 1-888-567-9596 Doc.# 005-2QG218D_A 3/1/02 Page 13 Technical Specification 24Vin 1.8Vout 25AQuarterQuarter BrickBrick Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our web site or is available upon request from SynQor. Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor. Contact SynQor for further information: Phone: 978-567-9596 Toll Free: 888-567-9596 Fax: 978-567-9599 E-mail: sales@synqor.com Web: www.synqor.com Address: 188 Central Street Hudson, MA 01749 Output Max Output Full Load Voltage Current Efficiency PQ24018QGA25xyz 18 - 36 V 1.8 V 25 A 84% PQ24033QGA25xyz 18 - 36 V 3.3 V 25 A 87% PQ24050QGA20xyz 18 - 36 V 5.0 V 20 A 87% PQ24120QGA08xyz 18 - 36 V 12 V 8.3 A 88% PQ24150QGA07xyz 18 - 36 V 15 V 6.7 A 87% Model Number Input Voltage Application Notes Available  Current Sharing for Full Feature Modules  EMI Characteristics  Thermal Relief Vias  Input System Instability All application notes and technical white papers can be downloaded in pdf format at www.synqor.com. PQ 48 033 H T A 50 N K S Product Family Package Size Performance Level Thermal Design Output Current Options (see Ordering Information) Input Voltage Output Voltage Enable Pin Feature Logic Length Set P - Positive N - Negative K - 0.110" N - 0.145" R - 0.180" Y - 0.250" S - Standard Options Description: x y z