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TPS3702: What precautions should be taken when using a voltage divider to scale my sense voltage?

Lauren Mayfield
Expert 6890 points
Part Number: TPS3702
Other Parts Discussed in Thread: TPS3700, TPS3808, , TPS3890

 Can I measure 12V with the TPS3702CX33 using a voltage divider to scale 12V down to 3.3V or should I use a different device such as the TPS3700?

 

If I can use voltage divider for the TPS3702CX33, what precaution should be taken regarding the external error added to the detection circuit?

  • 0
    TI__Genius 9375 points

    Lauren,

    The optimal choice to divide down from a 12V rail is to use an adjustable part to divide down to the voltage threshold closest to the bandgap reference of the device. This makes the TPS3702 an sub-optimal choice for a 12V rail monitor. You can use the TPS3700 to do this natively, or use devices such as the TPS3808 or TPS3890 to divide with an adjustable SENSE feature.

    That being said, reading http://www.ti.com/lit/an/slva450a/slva450a.pdf will help you calculate and analyze the inaccuracies that come with resistor dividing at a comparator.

    Thanks,
    Abhinav.