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TPS65982: Q2 MOSFET Burnout issue
Part Number: TPS65982
When I test OCP function of TPS65982, I found some problem about 5V negotiate from PP_EXT. Below shows the OCP waveform capture.
When over current occur, would shut down PP_VBUS and try to return normal, and PP_VBUS last about 150mS, I think it's not in good protect state, what should be the correct state?
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In reply to Adam Mc Gaffin:
Exactly, I set the over current timeout as default showed as below
"You can also peak current capabilities to be sinked for each PDO."
I don't get this point, I have set peak current as 150%, and I don't this this will cause over current retry last time.
In reply to Picher Lu:
Then the timeout should be the 640us that you have it set to. The typical characteristics for over current situations are shown in sections 18.104.22.168 and 22.214.171.124 of the datasheet.
Thanks for your reply.
Exactly, when 5V negotiate from PP_5V0, 9V/12V/15V/20V negotiate form PP_EXT, the OCP characteristics can meet the spec, But 5V negotiate from PP_EXT alway have a waveform like above, at retry process the voltage last too long.
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