Datasheet

Thermal Shutdown Power Good (PWRGD)
TPS54310-EP
www.ti.com ..................................................................................................................................................................................................... SLVS818 – APRIL 2008
The device uses the thermal shutdown to turn off the The power good circuit monitors for under voltage
power MOSFETs and disable the controller if the conditions on VSENSE. If the voltage on VSENSE is
junction temperature exceeds 150 ° C. The device is 10% below the reference voltage, the open-drain
released from shutdown when the junction PWRGD output is pulled low. PWRGD is also pulled
temperature decreases to 10 ° C below the thermal low if VIN is less than the UVLO threshold, or
shutdown trip point and starts up under control of the SS/ENA is low, or thermal shutdown is asserted.
slow-start circuit. Thermal shutdown provides When VIN = UVLO threshold, SS/ENA = enable
protection when an overload condition is sustained for threshold, and VSENSE > 90% of V
ref
, the open drain
several milliseconds. With a persistent fault condition, output of the PWRGD pin is high. A hysteresis
the device cycles continuously; starting up by control voltage equal to 3% of V
ref
and a 35-µs falling edge
of the soft-start circuit, heating up due to the fault, deglitch circuit prevent tripping of the power good
and then shutting down upon reaching the thermal comparator due to high frequency noise.
shutdown point.
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Product Folder Link(s): TPS54310-EP