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PQ50050HPB50 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ50050HPB50 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 14 page  Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 10 Input: Output: Current: Part No.: BASIC OPERATION AND FEATURES The PowerQor series converter uses a two-stage power conversion Power Power 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 fre- quency for predictable EMI performance. Rectification of the trans- former’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 Power Power 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 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, quarter-brick and eighth- 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 ref- erenced 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): REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs 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 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 [Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] < 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 higher than its speci- fied value. Note: the output over-voltage protection circuit senses the voltage 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. Figure A: Various circuits for driving the ON/OFF pin. TTL 5V ON/OFF Vin(_) Vin(+ in( in( ) + + 50k 274k 50k 100pF Open Collector Enable Circuit Remote Enable Circuit Direct Logic Drive Negative Logic (Permanently Enabled) (Permanently Enabled) ON/OFF Vin(_ ) ON/OFF ON/OFF Vin(_ ) ON/OFF 5V TTL/ CMOS Vin(_ ) Vin(_ ) Positive Logic ON/OFF Vin(_ ) Figure B: Internal ON/OFF pin circuitry |
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