The integrated driver senses the GaN die temperature and outputs the information through a modulated PWM signal on the TEMP pin. The typical PWM frequency is 9 kHz with the same refresh rate. The minimum PWM duty cycle is around 1%, which can be observed at temperature below 25°C. The target temperature range is from 25°C to 150°C, and the corresponding PWM duty cycle is typically from 3% to 82%. Following equation can be used to calculate the typical junction temperature T_J,typ in °C from the duty cycle D_TEMP:

The tolerances of typical measurement are listed in Table 8-1.

At temperatures above 150°C, the duty cycle continues to increase linearly until overtemperature fault happens. When overtemperature happens, the TEMP pin is pulled high to indicate this fault until the temperature is reduced to the normal range. There is a hysteresis to clear overtemperature fault.