TPS61165: output capacitor

Dongbao Zhou

Part Number: TPS61165

Hi,

My customer use tps61165 in one of their display module, they use 47uF (16V, aluminum)+220uF (16V, aluminum)+0.1uF (ceramics) as the output capacitor, however, they faced with some output capacitor failure (C4).

According to d/s, the recommended output capacitor is 1-10uF, is there any something to do with the capacitor selection?

Thanks.

Dongbao

over 7 years ago

0 Rodney Jones over 7 years ago

TI__Prodigy 600 points

This Thread has been assigned. Someone will get back to you shortly.

0 Caryss Li over 7 years ago

TI__Expert 4550 points

Hi Dongbao,

Is it necessary to use such high capacitor 220uF here? 47uF is enough for most cases.

When the capacitor fails, any high voltage or high current ripple observed? is this a duplicated failure or single one?

0 Dongbao Zhou over 7 years ago in reply to Caryss Li

TI__Expert 4170 points

Hi Caryss,

It's not a common case.

I agree with you that 47uf will meet the most scenario, need to check with you the stability of this circuit with such big output capacitor. According to the datasheet, if output capacitor is below 1uf to 10uf, it will cause a stability issue.

Dongbao

0 Caryss Li over 7 years ago in reply to Dongbao Zhou

TI__Expert 4550 points

Hi Dongbao,
Large capacitors will lead the system response too slow.

If you have no other questions, I will close this issue.

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TPS61165: output capacitor