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PQ60280FTA26PNS-G Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60280FTA26PNS-G Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 14 page  Product # PQ60280FTA26 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2FT628P Rev. C 5/21/08 Page 10 T Technical S echnical Specification pecification Input: Input: Output: Output: Current: Current: PPackage: ackage: 36-75 V 36-75 V 28 V 28 V 26 A 26 A Full-brick Full-brick BASIC OPERATION AND FEATURES The PowerQor series converter uses a two-stage power conver- sion topology. The first stage 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 isola- tion and voltage step-down to achieve the low output voltage required. Both the first stage and the second stage switch at a fixed fre- quency for predictable EMI performance. Rectification of the transformer’s output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resis- tance, dissipate far less energy than Schottky diodes. This is the primary reason that the PowerQor converter has such high effi- ciency, even at very low output voltages and very high output cur- rents. Dissipation throughout the converter is so low that it does not require a heatsink for operation. Since a heatsink is not required, the PowerQor series of converters do not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. The PowerQor series of converters can thus be built more simply and reliably using high yield surface mount tech- niques on a PCB substrate. The PowerQor series converters use the industry standard foot- print and pin-out configuration. CONTROL FEATURES REMOTE ON/OFF (Pin 3): The (+)ON/OFF input, Pin 3, per- mits the user to control when the converter is on or off. This input is referenced (-)ON/OFF. 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 ION/OFF turns the converter on). In the neg- ative logic version, the ON/OFF signal is active low (meaning that a low ION/OFF turns the converter on). Figures A & B detail two possible circuits for driving the ON/OFF pin. REMOTE SENSE(+) (Pins 11 and 12): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 11 should be connected to Vout(+) and Pin 12 should be con- nected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is Pins 11 and 12 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 speci- fied value. Note: the output over-voltage protection circuit senses the voltage across the output (pins 16 and 13) to determine when it should trigger, not the voltage across the converter’s sense leads (pins 11 and 12). 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 10): 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 10 and Pin 12 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be Rtrim-down = ( 732) - 8.94 (kW) D where D% = Vnominal – Vdesired x 100% Vnominal ION/OFF VIN IN (+) +ON/OFF -ON/OFF V(-) VOUT(+) SENSE (+) SENSE (-) VOUT(-) ION/OFF VIN IN (+) +ON/OFF -ON/OFF V(-) VOUT(+) SENSE (+) SENSE (-) VOUT(-) Figure A: Typical circuit for driving the ON/OFF pin. Figure B: Another circuit for driving the ON/OFF pin. |
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