ZHCSFM7C October 2016 – August 2023 TPS568215
PRODUCTION DATA
The device monitors the internal die temperature. If this temperature exceeds the thermal shutdown threshold value (TSDN typically 160°C) the device shuts off. This is a non-latch protection. During start up, if the device temperature is higher than 160°C the device does not start switching and does not load the MODE settings. If the device temp goes higher than TSDN threshold after startup, it stops switching with SS reset to ground and an internal discharge switch turns on to quickly discharge the output voltage. The device re-starts switching when the temperature goes below the thermal shutdown threshold but the MODE settings are not re-loaded again. There is a second higher thermal protection on the device TSDN VREG5 which protects it from over temperature conditions not caused by the switching of the device itself. This threshold is at typically 170°C. Even under nonswitching condition of the device after exceeding TSDN threshold, if it still continues to heat up the VREG5 output shuts off after temperature goes beyond TSDN VREG5, thereby shutting down the device completely.