BQ24045: NTC calculation question

Patrick Chen

Part Number: BQ24045

Hello

For NTC specification as below. It is 27.28K on 0°C temperature. BQ24045 bias current is 50uA. 50uAx27.28K=1364mV. But It looks not match VTS-0°C of our spec table. Has any problem for the calculation? Thank you.

Patrick

over 7 years ago

0 Bill Johns over 7 years ago

TI__Guru* 78696 points

Hi
The calculation is correct, exact value you will need for 0C is 24.6k which is between 0C 27.28k ohms and 5C 22.05k ohms. You will want the NTC off at 0C and this configuration gives you a couple of degrees of margin.

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BQ24045: NTC calculation question