UM0971 datasheet(23/45 Pages) STMICROELECTRONICS

Part #	UM0971

Description	STEVAL-IHM031V1 low voltage three-phase inverter demonstration board

PDF	45 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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23 / 45 page

UM0971

Board description

Doc ID 17701 Rev 1

23/45

2.7

Temperature sensing and protection

A hardware temperature sensing has also been implemented on the STEVAL-IHM031V1

demonstration board. As this signal is available on the MC connector, with a proper control

logic, this feature helps to fully protect the switches against damage when power loss

reaches some defined value.

The temperature is sensed with an NTC resistor placed close to the power MOSFET device.

The measured analog value is fed through the MC connector to the control unit part and, for

instance, can be read with an AD converter of the microcontroller.

Figure 14.

Temperature sensing circuit

With the following used resistor values:

RNTC = 10 k

Ω, R1 = 130 Ω, R2 = r = 10 kΩ, and R = 39 kΩ, the shut down temperature is

around 70 °C.

UM0971 Datasheet(PDF) 23 Page - STMicroelectronics