Datasheet

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Thermal Shutdown Power Good (PWRGD)
TPS54310
SLVS412D – DECEMBER 2001 – REVISED FEBRUARY 2007
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 threshold, and VSENSE > 90% of V
ref
, the open
for several milliseconds. With a persistent fault drain output of the PWRGD pin is high. A hysteresis
condition, the device cycles continuously; starting up voltage equal to 3% of V
ref
and a 35-µs falling edge
by control of the soft-start circuit, heating up due to deglitch circuit prevent tripping of the power good
the fault, and then shutting down upon reaching the comparator due to high frequency noise.
thermal shutdown point.
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