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APE8957 Datasheet(PDF) 5 Page - Advanced Power Electronics Corp. |
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APE8957 Datasheet(HTML) 5 Page - Advanced Power Electronics Corp. |
5 / 6 page Advanced Power Electronics Corp. APE8957 FUNCTION DESCRIPTION(Cont.) Output Voltage Regulation Under Voltage Protection (UVP) Thermal Shutdown 5 An error amplifier working with a temperature compensated 0.8V reference and an output NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. It compares the reference with the feedback voltage and amplifies the difference to drive the output NMOS which provides load current from VIN to VOUT. The APE8957 monitors the voltage on FB pin after soft-start process is finished. Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls below the under-voltage threshold, the UVP circuit shuts off the output immediately. After a while, the APE8957 starts a new soft-start to regulate output. A thermal shutdown circuit limits the junction temperature of APE8957. When the junction temperature exceeds +150°C, a thermal sensor turns off the output NMOS, allowing the device to cool down. The regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 50°C, resulting in a pulsed output during continuous thermal overload conditions. |
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