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TLV3402 under +/-5V dual supply

Frank Xie
Prodigy 75 points
Other Parts Discussed in Thread: TLV3402

Dear all,

One customer using TLV3402 under +/-5V dual supply condition, and got the test result that:  If Vin is smaller than -6Vdc,the voltage is clamped to about -5.5Vdc at input pin,however,if I apply +6Vdc to the input,it is not clamped.

 Does there is no current limit resistor for negative input, just one switching diode?

Many thanks for your comments  ☺

  • 0
    TI__Intellectual 2590 points

    Xie,

    I just had a look at the datasheet and on the front page (and also the spec table) you can find a note saying that the "Input Common-Mode Range Exceeds the Rails:  –0.1 V to VCC + 5 V". I interpret that comment to mean that there could be a an ESD diode clamping to the negative supply rail, which is also what your customer confirms. But there is probably some other structure to the positive rail that allows the input to exceed the positive supply and still operate correctly. The datasheet does not really explain any details. One thing to also keep in mind is that the TLV3402 has an open drain output which means that the positive output voltage is set by a pull-up to some voltage. This voltage might be the same as the supply voltage of the comparator, but it could also be different. A higher voltage to the pull up would explain why your customers would see a higher output voltage.

    Hope this helps

    Frank

  • 0 in reply to Winnie Puuh
    TI__Prodigy 75 points

    Hi, Frank,

    Thanks a lot for your kindly help, which helps me very much. ☺

    Frank Xie