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TI Home » TI E2E Community » Support Forums » Other Analog & Touch » Temperature Sensors » Temperature Sensors Forum » TMP300 temperature switch.
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TMP300 temperature switch.

This question is answered
Prema Kumar AK
Posted by Prema Kumar AK
on Jun 23 2012 02:05 AM
Prodigy80 points

Hello 

We have used TMP300 temperature switch.

We are tested the device and have some technical issue. We need to set temperature threshold @ -20 deg cel to make heater ON.

For testing we set temperature to 18 to 25 deg cel using Rset resistor.  According to data sheet and our understanding out# (pin 3) should go low (sharp falling) once set temperature is reached. But what we found is falling high to low is very slow,  just like some analog signal. For your reference I have attached the schematic used for testing.

Kindly suggest if it is correct or any modification required in it.

We need this temperature switch to control the heater ON/OFF. Whether this chip is suitable for such application or you have better solution.

Again, can this chip able to drive PMOS with Imax of 3A.

Kindly clarify.

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  • Prema Kumar AK
    Posted by Prema Kumar AK
    on Jul 19 2012 23:30 PM
    Prodigy80 points

    Chris, 

    Thanks for your replay.

    So finally the conclusion is I have to use an inverted gate driver to drive a PMOS.

    Because I need PMOS to ON when output is high and OFF for low output.

    thanks for quick reply.

    Regards,

    Prem

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  • Chris Featherstone
    Posted by Chris Featherstone
    on Jul 20 2012 11:56 AM
    Expert5125 points

    Prem,

    No problem. I'm glad we could help out. 

    Best Regards,

    Chris Featherstone
    Linear Characterization Engineer
    High Performance Linear Products

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