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UM0971 Scheda tecnica(PDF) 23 Page - STMicroelectronics |
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UM0971 Scheda tecnica(HTML) 23 Page - STMicroelectronics |
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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. |
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