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.

11 days ago

0 Clemens Ladisch 10 days ago

Guru 283370 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 Vzaz 10 days ago 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 Jacob Freet 10 days ago in reply to Vzaz

TI__Expert 8380 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 Vzaz 7 days ago in reply to Jacob Freet

Prodigy 10 points

Thank you for your answers Jacob and Clemens.

Understood.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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OPA838: OPA838 Power-Down feature