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IQ36070HPC30NRS Datasheet(PDF) 26 Page - SynQor Worldwide Headquarters |
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IQ36070HPC30NRS Datasheet(HTML) 26 Page - SynQor Worldwide Headquarters |
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26 / 30 page  Technical Specification IQ36-HP Family Product # IQ36xxxHPXxx Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005231 Rev. A 05/26/09 Page 26 BASICOPERATIONANDFEATURES This converter series uses a two-stage power conversion 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-up or step-down to achieve the 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 far less energy than Schottky diodes. This is the primary reason that the converter has such high efficiency, even at very low output voltages and very high output currents. These converters are offered totally encased to withstand harsh environmentsandthermallydemandingapplications.Dissipation throughout the converter is so low that it does not require a heatsink for operation in many applications; however, adding a heatsink provides improved thermal derating performance in extreme situations. This series of converters use the industry standard footprint and pin-out configuration. CONTROLFEATURES REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,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(-). TheON/OFFsignalisactivelow(meaningthatalowturnsthe converteron).FigureAdetailsfourpossiblecircuitsfordriving theON/OFFpin.FigureBisadetailedlookoftheinternalON/ OFFcircuitry. REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’soutputpinstotheload. Pin 7 should be connected to Vout(+) and Pin 5 should be connectedtoVout(-)atthepointontheboardwhereregulation 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 Pins 7 and 5 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 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 leads(pins7and5).Therefore,theresistivedropontheboard should be small enough so that output OVP does not trigger, even during load transients. Open Collector Enable Circuit Remote Enable Circuit Direct Logic Drive Negative Logic (Permanently Enabled) ON/OFF Vin(_ ) ON/OFF ON/OFF Vin(_ ) ON/OFF 5V TTL/ CMOS Vin(_ ) Vin(_ ) Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry TTL 5V 50k 50k ON/OFF Vin(_) 100pF |
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