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PQ60018ETA45NRS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60018ETA45NRS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 14 page  Product # PQ60018ETL45 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2ET618F Rev. B 06/01/09 Page 10 Input: Output: Current: Package: 35-75 V 1.8 V 45 A Eighth-brick Technical Specification OpenCollectorEnableCircuit Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry Remote Enable Circuit Direct Logic Drive NegativeLogic (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 10k ON/OFF Vin(_) 100pF BASICOPERATIONANDFEATURES The single stage power converter switches at a fixed frequency forpredictableEMIperformance.Rectificationofthetransformer’s output is accomplished with synchronous rectifiers. These devices, whichareMOSFETswithaverylowon-stateresistance,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 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 eighth-brick, quarter-brick and half-brick converters uses the industry standard footprint and pin-out con- figuration. CONTROLFEATURES REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits the user to control when the converter is on or off. This input is referencedtothereturnterminaloftheinputbus,Vin(-).Thereare two versions of the converter that differ by the sense of the logic usedfortheON/OFFinput. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on).Inthenegativelogic version, the ON/OFF signal is active low (meaning that a low turns the converter on).FigureAdetailsfivepossiblecircuitsfor drivingtheON/OFFpin.FigureBisadetailedlookoftheinternal ON/OFFcircuitry. REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’soutputpinstotheload. Pin7shouldbeconnectedtoVout(+)andPin5shouldbecon- 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(-)] < SenseRange%xVout Pins7and5mustbeconnectedforproperregulationoftheout- putvoltage.Iftheseconnectionsarenotmade,theconverterwill deliver an output voltage that is slightly higher than its specified value. Note:theoutputover-voltageprotectioncircuitsensesthevoltage across the output (pins 8 and 4) to determine when it should trig- ger,notthevoltageacrosstheconverter’ssenseleads(pins7and 5). 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 6):TheTRIMinputpermitsthe 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 betweenPin6andPin5(SENSE(-)input).Foradesireddecrease of the nominal output voltage, the value of the resistor should be Rtrim-down = (511) -10.22 (kW) D % where D% = Vnominal–Vdesired x100% Vnominal Application Section |
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