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TLV3402: output varies when IN- is alway higher than IN+

Part Number: TLV3402
Other Parts Discussed in Thread: LM2903, TLC372

Hi, my customer's schematic is as below: U2 is TLV3402.

The waveform of pin 2- yellow, pin 3- green, pin1-blue are shown below:

As we can see, pin2(IN-) is always higher than pin3(IN+), but pin 1(output) still varies with IN+'s variation, why?

  • Hello Howard,

    Are all devices doing this? Or just one? Out of how many?

    Are they sure it is not U2-B being fed a similar signal? U2-A and U2-B share outputs.

    Also - this is a nanopower (500nA) comparator. Pulling-down 6mA on the output is pretty heavy - and also into the current limit (see figure 5 output current graph).

    I would recommend a more conventional power device such as the TLC372 or LM2903. From the pull-down and divider resistor sizes, they do not seem to be interested in the "nanaopower" supply current aspect of the TLV3402, so there are other (sometimes cheaper) options.

  • Howard,

    Since there has not been a response in 2 weeks, we will be closing this thread.

    Regards,

    Jonny