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TMCS1123: High temperature current sensing device

Luis Eduardo Pedro Sedeño
Prodigy 30 points
Part Number: TMCS1123
Other Parts Discussed in Thread: INA271-HT

Tool/software:

Hello, I am Luis Eduardo. I need to design a current sensing stage of dozens of amps and working at high temperature, if possible, more than 175ºC. As I have learnt:

-It is not a good idea to measure such high current with a shunt. Dissipated power is very high and very small values shunt makes tolerances very poor.

-I have seen hall sensors like TMCS1123 but it works only up to 125ºC.

Is there any other solutions?

Thank you so much.

  • +1
    TI__Expert 8115 points

    Hello Luis,

    The INA271-HT is our only high-temperature part for current sensing. For the shunt resistor it looks like there are high-temperature options that exist, one that would work is the PU5931FKMT50R001L. These resistors have specifications for power derating at higher temperatures, so you should find a resistor that will tolerate your current levels based on your expected temperature. The resistor I pointed out also has a low resistance of only 1 mΩ, which will work for up to 50A at 175C. Since the INA271-HT only has a gain of 20V/V, you will need to put several of these resistors in series to make the signal level higher.

    Let me know if you have any more questions,

    Levi DeVries