OPA838: OPA838 Power-Down feature

Vzaz

Prodigy 20 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.

10 months ago

0 Clemens Ladisch 10 months ago

Guru 318050 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 months ago in reply to Clemens Ladisch

Prodigy 20 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 months ago in reply to Vzaz

TI__Expert 8680 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 10 months ago in reply to Jacob Freet

Prodigy 20 points

Thank you for your answers Jacob and Clemens.

Understood.

Amplifiers

Amplifiers forum

OPA838: OPA838 Power-Down feature