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SQ60120QPA28NNS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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SQ60120QPA28NNS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 12 page  Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. B 06/17/09 Page 11 Input: Output: Current: Package: 36-75 V 12 V 28 A Quarter-brick Technical Specification Over-Temperature Shutdown : A temperature sensor on the converter sensesthe average temperature of themodule. The ther- mal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over-Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-TemperatureShutdownRestartHysteresisvalue. Vin UVLO On/Off (N logic) OFF ON t0 Vout 12V 200 ms 12 ms Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period. APPLICATION CONSIDERATIONS Start-Up Inhibit Period : Figure E details the Start-Up Inhibit Period for the BusQor modulewhen Vin is applied with the On/ Off pin asserted (enabled). Before time t1, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under- Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a typical Startup Inhibit Period of 8 ms from a Vin start-up. Once the module recognizes it should be on it waits an additional 4 ms before it starts. When starting from an on/off event the module has an inhibit time of 200 ms like our standard products. The output builds up to 90% or higher of the nominal voltage and stabilizes to its nominal output voltage in a total time of 8 ms typical. The the module has a Vout rise time of 4 ms typically. At time t2, when the On/Off pin is de-asserted (disabled), the BusQor module stops switching immediately. Fall time from 12 V to 0 V is dependent on output capacitance load current, and any parasitic trace inductance in the output load circuit. t t1 t2 t3 At time t3, when the On/Off pin is re-asserted (enabled), the BusQor module output begins to build up after the inhibit period of 200 ms typical. Refer to the Control Features section of the data sheet for details on enabling and disabling methods for N and P logic type modules. Time 208 ms |
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