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PQ60018QML15NYS Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ60018QML15NYS Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  Product # PQ60018QML15 Phone 1-888-567-9596 Doc.# 005-2QM618E Rev. A 8/16/02 Page 9 Technical Specification 48Vin 1.8Vout 15A Quarter Quarter Brick Brick 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 out- put voltage constant over variations in line, load, and temper- ature. The second stage uses a transformer to provide the func- tions 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 transformer’s output is accomplished with synchronous recti- fiers. 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 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 base- plate 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. CONTROL FEATURES REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, per- mits 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 cir- cuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 7 should be connected to Vout(+) and Pin 5 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 volt- age drop only as large as that specified in this datasheet, that is [Vout(+) - Vout(-)] – [SENSE(+) - SENSE(-)] < Sense Range % x Vout Pins 7 and 5 must be connected for proper regulation of the output voltage. If these connections are not made, the convert- er will deliver an output voltage that is slightly lower than its specified value. Open Collector Enable Circuit Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry 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(_ ) TTL 5V 50k 274k Vin(+) ON/OFF Vin(_) 50k 100pF |
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