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How does a high-voltage IPD detect temperature for thermal shutdown?

The thermal shutdown temperature is detected by monitoring the forward voltage (VF) of a temperature detection diode on a chip.

The forward voltage of the diode has a temperature coefficient of roughly -2 mV/°C. The forward voltage of the temperature detection diode is compared with the internal reference voltage, and when the forward voltage falls below the reference voltage because of an increase in temperature, the thermal shutdown threshold is tripped to protect the IPD from excessive temperature.

Figure 1 Temperature detection circuit

Figure 1 Temperature detection circuit

Thermal shutdown temperature

For High-voltage IPD’s thermal shutdown, please refer to High voltage intelligent power device application note

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