TPS25200: Output discharge function in usb input protect application

Will Wang47

Part Number: TPS25200

Hi Team,

Customer use TPS25200 in the usb protect circuit. Their output get large caps, the input cap is smaller compared with output cap. When they move away the USB input power, does it possible for the output discharge circuit discharge the output cap to 0V very fast?

If not, is there any method to let the output discharge circuit work when move away the USB input? Could you give some comments on this application?

Best Reards,

Will

over 4 years ago

0 Rakesh over 4 years ago

TI__Guru** 102951 points

Hi Will,

Do you have target time to discharge. ?

Best Regards,

Rakesh

0 Will Wang47 over 4 years ago in reply to Rakesh

TI__Expert 6320 points

Less than 2s is acceptable.

0 Will Wang47 over 4 years ago in reply to Rakesh

TI__Expert 6320 points

Hi Rakesh,

Could you give some further comments on this?

0 Rakesh over 4 years ago in reply to Will Wang47

TI__Guru** 102951 points

Hi Will,

TPS25200 has internal discharge circuit at the OUT with max. pull-down resistance of 625-Ohm. So, 220uF can be discharged to '0' V in 5*625*220u = 0.687 sec. I suggest to use EVM and verify on the actual application.

Best Regards,

Rakesh

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TPS25200: Output discharge function in usb input protect application