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PQ50073HZB60NNS-G Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ50073HZB60NNS-G Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 12 page  Product # PQ50073HZB60 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005484 Rev. B 10/25/12 Page 9 Input: 44-52V Output: 7.3V Current: 60A Package: Half-Brick Applications Section Applications Section BASIC OPERATION AND FEATURES This converter series uses a two-stage power conversion 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 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 significantly less energy than Schottky diodes, enabling the converter to achieve high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink or even a baseplate for operation in many applications; however, adding a heatsink provides improved thermal derating performance in extreme situations. To further withstand harsh environments and thermally demanding applications, certain models are available totally encased. See Ordering Information page for available thermal design options. SynQor half-brick converters use the industry standard footprint and pin-out. Figure A: Various Circuits for Driving the ON/OFF Pin. 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(_ ) TTL 5V 10k 50k ON/OFF Vin(_) 18V(max) Figure B: Internal ON/OFF Pin Circuitry. 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(-). In negative logic versions, the ON/OFF signal is active low (meaning that a low voltage turns the converter on). In positive logic versions, the ON/OFF input is active high (meaning that a high voltage turns the converter on). Figure A details possible circuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. See Ordering Information page for available enable logics. REMOTE SENSE Pins 8(+) and 6(-): The SENSE(+) and 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 connected to Vout(-) at the point on the board where regulation is desired. 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 trigger, 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. |
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