PGA2320 powersupply sequencing

Jan Volkering

Other Parts Discussed in Thread: PGA2320

HI,

I am using a PGA2320 in my design.

Due to many decoupling caps in the total design the inrush currents at start up on both the +/-15V supply and the +5V supply are quite big and cause startup problems in the front side DCDC converters (I am using post LDO's on all rails).

To get a reliable power supply start up I intend to sequence both supplies and implement a linear voltage ramp for these supplies to limit the inrush currents.

Downside is that the +/-15V and the +5V supplies do not start up at the same time and will start up slower (~100mS).

Can the PGA2320 gets damaged if the +/-15V and +5V supply do not start up at the same time?

Is there a minimum or maximum power supply startup dV/dT requirement?

over 8 years ago

0 Diego Melendez over 8 years ago

TI__Guru 57800 points

Hi, Jan,

I think that as long as the +/- 15V power supply is turned ON first, there should be no issues. I have notified my colleague expert in this device about your question, he will provide an accurate response soon.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Tim Claycomb over 8 years ago in reply to Diego Melendez

TI__Genius 15410 points

Hi Jan,

I do not see an issue with the +/-15V and +5V supplies starting up at different times. However, I do recommend powering the +5V supply first so that the device is held in a MUTE condition when the +/-15V supplies turn on.

-Tim Claycomb

0 Jan Volkering over 8 years ago in reply to Tim Claycomb

TI__Expert 8190 points

Tim,

Thanks for the answer.

Audio

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PGA2320 powersupply sequencing