Datasheet

www.ti.com
THERMAL SHUTDOWN POWER-GOOD (PWRGD)
TPS54610
SLVS398F – JUNE 2001 – REVISED APRIL 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 automatically when the PWRGD output is pulled low. PWRGD is also pulled
junction temperature decreases to 10 ° C below the low if VIN is less than the UVLO threshold or
thermal shutdown trip point, and starts up under SS/ENA is low, or a thermal shutdown occurs. When
control of the slow-start circuit. VIN ≥ UVLO threshold, SS/ENA ≥ enable threshold,
and VSENSE > 90% of V
ref
, the open drain output of
Thermal shutdown provides protection when an
the PWRGD pin is high. A hysteresis voltage equal
overload condition is sustained for several
to 3% of V
ref
and a 35 µ s falling edge deglitch circuit
milliseconds. With a persistent fault condition, the
prevent tripping of the power good comparator due
device cycles continuously; starting up by control of
to high frequency noise.
the soft-start circuit, heating up due to the fault
condition, and then shutting down upon reaching the
thermal shutdown trip point. This sequence repeats
until the fault condition is removed.
16
Submit Documentation Feedback