TPS62933O datasheet(21/47 Pages) TI

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Furthermore, if a severe overload or short circuit causes the FB voltage to fall below VUVP threshold, 65% of the

VREF, and triggering current limit, and the condition occurs for more than the hiccup ON time (typical 256 μs), the

converter enters hiccup mode. In this mode, the device stops switching for hiccup off time, 10.5 × tSS, and then

goes to a normal restart with soft-start time. If the overload or short-circuit condition remains, the device runs

in current limit and then shuts down again. This cycle repeats as long as the overload or short-circuit condition

persists. This mode of operation reduces the temperature rise of the device during a sustained overload or short

circuit condition on the output. Once the output short is removed, the output voltage recovers normally to the

regulated value.

8.3.12 Thermal Shutdown

The junction temperature (TJ) of the device is monitored by an internal temperature sensor. If TJ exceeds 165°C

(typical), the device goes into thermal shut down, both the high-side and low-side power FETs are turned off.

When TJ decreases below the hysteresis amount of 30°C (typical), the converter resumes normal operation,

beginning with a soft start.

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TPS62933

SLUSEA4A – JUNE 2021 – REVISED DECEMBER 2021

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TPS62933O Datasheet(PDF) 21 Page - Texas Instruments