TPS565208: TPS565208 output capacitor question

Dane Zhang

Expert 7605 points

Part Number: TPS565208

Hi team,

we suggest 20-68uF for Cout. will using a larger capacitor like 470uF lead to any risk?

any test recommended to add to prove the system is OK?

over 1 year ago

0 Shipeng Cheng over 1 year ago

TI__Genius 16960 points

Hi Dane,

Usually 20-68uF(ceramic cap) is enough to achieve good ripple and transient response. So I want to know your purpose of using a 470uF(electrolytic cap I think). And the large ESR of electrolytic cap may cause loop stability problem.

Best Regards,

Shipeng

0 Dane Zhang over 1 year ago in reply to Shipeng Cheng

TI__Expert 7605 points

Hi Shipeng,

There maybe some large transient and need larger output caps.

if the loop test and transient test can pass, it means 470uF is acceptable?

0 Shipeng Cheng over 1 year ago in reply to Dane Zhang

TI__Genius 16960 points

Hi Dane,

Yes. if there's enough phase margin, 470uF is acceptable.

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TPS565208: TPS565208 output capacitor question