This device possesses thermal shutdown (T_ABS) circuitry as a protection from overheating. For continuous normal operation, the junction temperature must not exceed the thermal-shutdown trip point. If the junction temperature exceeds the thermal-shutdown trip point, the output turns off. When the junction temperature falls below the thermal shutdown hysteresis, the output turns on again.

Calculate the power dissipated by the device according to Equation 13.

where

• P_T = total power dissipation of the device

After determining the power dissipated by the device, calculate the junction temperature from the ambient temperature and the device thermal impedance.

For more information, please see the How to Drive Resistive, Inductive, Capacitive, and Lighting Loads application note.