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OPA2134: Disable Circuit

Katharina Berberich79
Prodigy 60 points
Part Number: OPA2134
Other Parts Discussed in Thread: TLC2274,

Hi,

can you please look at the attached cirucit diagram. What you think about it.

I believe ist risky because we can have a voltage at the output while no supply voltage is present

Basically we need a programmable treshold value that has a Default value when the uC is not operating.

We also need a solution that we can adapt for a high temperature design and we did not find an amplifier with enable for this.

The circuit Shows TLC2274 but as mentioned below we want to use the OPA2134.

Best regards,

Katharina

new_Threshold.pdf

  • 0
    TI__Genius 15410 points

    Hi Katharina,

    If a voltage is expected to be present at the output while the power supplies are off some sort of protection circuitry is recommended. I recommend checking out our TI Precision Lab training videos on Electrostatic discharge (ESD) and Electrical Overstress (EOS) for some recommended protection circuitry.

    What temperature range do you need the amplifier to operate at?

    Thank you,

    Tim Claycomb

  • 0 in reply to Tim Claycomb
    Prodigy 60 points
    Hi Tim,

    for the high temperature Version I need it to operate up to 150C ambient.
    switching off supplies with the FETs you think is O.K.?

    best regards,
    Katharina
  • 0 in reply to Katharina Berberich79
    TI__Genius 15410 points

    Hello Katharina,

    I would still recommend using some TVS diodes on the power supplies so the current can flow back to ground when a voltage is present on the output.

    Thank you,

    Tim Claycomb