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PQ60280HEF13PRS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ60280HEF13PRS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  Product # PQ60280HEA13 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HE628P Rev. C 7/3/07 Page 11 T Technical S echnical Specification pecification Input: Input: Output: Output: Current: Current: PPackage: ackage: 35-75 V 35-75 V 28 V 28 V 12.8 A 12.8 A Half-brick Half-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 converter does not need a metal baseplate or pot- ting material to help conduct the dissipated energy to the heatsink. The PowerQor converter can thus be built more simply and reliably using high yield surface mount techniques on a PCB substrate. The PowerQor series of half-brick and quarter-brick converters uses the industry standard footprint and pin-out configuration. 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. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs cor- rect for voltage drops along the conductors that connect the con- verter’s output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 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 8 and 6 must be connected for proper regulation of the out- put voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. Note: the output over-voltage protection circuit senses the voltage across the output (pins 9 and 5) to determine when it should trig- ger, not the voltage across the converter’s sense leads (pins 8 and 6). 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 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 Rtrim-down = ( 100%) - 2 (kW) D where D% = Vnominal – Vdesired x 100% Vnominal 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 5V TTL/ CMOS Vin(_ ) ON/OFF Vin(_) Vin(_ ) |
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