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PQ24120QGA08PNS Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ24120QGA08PNS Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  referenced to the return terminal of the 24V input bus. There are two versions of the PowerQor series converter that differ by the sense of the logic used for the ON/OFF input. In the PQxxyyyQGAzzPxx version, the ON/OFF input is active high (meaning that a high turns the converter on). In the PQxxyyyQGAzzNxx 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 shows detail of the internal ON/OFF circuitry. Pins 7 and 5 (SENSE(+)): The SENSE(+) inputs correct for voltage drops along the conductors that connect the con- verter’s output pins to the load. Pin 7 should be connected to Vout(+) and Pin 5 should be connected to Vout(-) at the point on the board where regu- lation is desired. That is, [Vout(+) - Vout(-)] – [SENSE(+) - SENSE (-)] < 10%Vout Pins 7 and 5 must be connected for proper regulation of the output voltage. However, if these connections are not made, nothing catastrophic will happen to the converter under nor- mal operating conditions—the converter will simply 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 8 and 4) to determine when it should trigger, not the voltage across the converter’s sense pins (pins 7 and 5). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. Pin 6 (TRIM): The TRIM input permits the user to adjust the output voltage across the sense leads up or down. To lower the output voltage, the user should connect a resistor between Pin 6 and Pin 5, which is the SENSE(-) input. To raise the output voltage, the user should connect a resistor between Pin 6 and Pin 7, which is the SENSE(+) input. A resistor connected between Pin 6 and Pin 5 will decrease the output voltage. For a desired decrease of ∆ percent of the nominal output voltage, the value of this resistor should be Product # PQ24120QGA08 Phone 1-888-567-9596 Doc.# 005-2QG212D_A 3/1/02 Page 9 Technical Specification 24Vin 12Vout 8.3A Quarter Quarter Brick Brick Rtrim-down = ( 511) - 10.22 ∆% (k Ω) ∆ = (VNOM – VDES) x 100% VNOM where VNOM = Nominal Voltage VDES = Desired Voltage and 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(_) Figure B: Internal ON/OFF pin circuitry (detail) TTL 5V 50k 100k Vin(+) ON/OFF Vin(_) 50k 100pF |
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