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Our customer Colt Advance has a question about the usage of TPS25740A USB TYPE-C PD DFP side with MacBookPro.
Customer already paired their TPS25740A USB TYPE-C power supply with MacBookPro to provide 14.8V for the charging, but customer found that when the MacBookPro 100% fully charge + shut down mode + close the cover then plug into their USB TYPE-C power supply, the MacBookPro will have a “Don” sound, it is normal, after a few second, their USB TYPE-C power supply will drop from 14.8V to 5V, after around 3 second their USB TYPE-C power supply shown the output voltage ramp to 14.8V again and MacBookPro has a “Don” sound again, this symptom will happen in a loop.
note: This symptom will not happen with the “original MacBookPro power supply”.
Could you please help to check what happen on it and how to solve this issue?
Hi Andrew,
Is it possible for you to provide a PD message from a PD analyzer? It would also help us if you can describe how many times the VBUS cycles (5V to 0V to 5V to 14.8V) in a 1 minute interval. This can give us a good clue on where the issue occurs.
Regards,
Jimmy Hua
This morning we reviewed the flow and has a hypothesis :
The 14.8V to 0V (while Apple PS would go to 5V) - may mean under this situation either :
- Our PS section is not dropping the 14.8V to 5V quick enough (So MBP detect a over-voltage situation so disconnect / shut down the PD VBUS
- TPS25740A is receiving / interpreting the PD common to switch to 5V - also causing the same disconnect / shut down of the PD VBUS
Then the CA-PS switch up again to 14.8V
Jimmy - can you give a email to send the video private ?
Regards
Hi Andrew,
Can you provide your email contact information? I would like to take this discusion offline from E2E.
Regards,
Jimmy Hua
Hi Jimmy - I can see there is a new button at the top of - which is "Answer Suggested"
I don't see "Verify Answer" button so far
Please let me know if there might be anything wrong.
Anyway your answer provided and we verify that as able to solve our question.
Regards