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OPA838: OPA838 Power-Down feature

Vzaz
Prodigy 10 points
Part Number: OPA838

Tool/software:

Hi,

Could you please confirm the OPA838 power-down operation?

The question is whether this is simply a reduction of supply current or an actual disable with output disconnect. 

Is the output still driving while in Power-Down?

Thank you for your answer.

  • 0
    Guru 295110 points

    In power-down mode, the output is disabled. So the output voltage can be affected by the feedback resistor(s); see the remarks in section 7.3.3.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Dear Clemens,

    Thank you for your answer. 

    Are you talking from experience with the specific part?

    Paragraph 7.3.3 is not clearly stating what you are saying. Neither are figures 6-51 to 6-54.

    Can we have a TI employee or FAE confirm your comment?

  • +1 in reply to Vzaz
    TI__Expert 8530 points

    Hi Vzaz, 

    Clemens is correct that the output is disabled during shutdown. The output enters a high-impedance state and the supply current is reduced. The part will no longer function like an amplifier. 

    Best, 

    Jacob 

  • 0 in reply to Jacob Freet
    Prodigy 10 points

    Thank you for your answers Jacob and Clemens.

    Understood.