TPS23754: TPS23754 output issues

LeoChen

Part Number: TPS23754

When power off to TPS23754, TPS23754 will output two voltage ripple, how to avoid it? below is my customer's schematic and output gif.

over 6 years ago

0 Artem Rogachev over 6 years ago

TI__Intellectual 1005 points

Leo,

I believe that we've seen this issue before. Let me confirm with my systems engineer and get back to you.

-Artem

0 Artem Rogachev over 6 years ago in reply to Artem Rogachev

TI__Intellectual 1005 points

Leo,

After some internal discussion, we believe that you may be hitting the Vc UVLO. Could you please capture a waveform with Vc and VDD1? This would really help us understand the behavior.

In addition can you provide a schematic that includes the output and also clarify P12V and L4_1. I assume that the P12V is the main output and L4_1 is one of the nodes of the output inductor.

-Artem

0 LeoChen over 6 years ago in reply to Artem Rogachev

Intellectual 560 points

Dear Artem,

Thanks for feedback, attached as followed.

0 Darwin Fernandez over 6 years ago in reply to LeoChen

TI__Mastermind 41770 points

Hi Leo,

Can you forward the PDF of the schematic? Because I am unable to look at the exact component part numbers/values. Also did you switch any FET components with any alternative part numbers? Please let us know.

Thanks!

0 Thomas Lewis over 6 years ago in reply to Darwin Fernandez

TI__Expert 5615 points

Leo, It has been quite some time since there was activity on this thread.

Do you still require our help?

Thanks,

0 Thomas Lewis over 6 years ago in reply to Thomas Lewis

TI__Expert 5615 points

Leo, I am going to close this thread given the lack of a response since end of July.

Should this still require assistance, all you have to do is reply and the thread will automatically "reopen."

Thank you for your local support, and promotion, of PoE products from TI,

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TPS23754: TPS23754 output issues