TPS65987D: UVP with PP3

Anderson2

Expert 1035 points

Part Number: TPS65987D

I use PP3 by external FET as VBUS source.

But PP3 looks UVP is not working even if I set in 0x28.

How can I set to work UVP?

over 6 years ago

0 Adam Mc Gaffin over 6 years ago

TI__Mastermind 30000 points

Hello,

Would you mind elaborating on what you mean by UVP is not tripping? Do you have an scope captures of your tests?

0 Anderson2 over 6 years ago in reply to Adam Mc Gaffin

Expert 1035 points

1Hi
When the contract is 20V and the DCDC converter outputs 20V, I change DCDC converter output from 20V to 15V.
But UVP is not working and 987D continue to output VBUS through PP3.
The PP_HV UVP setting is 10%.

0 Adam Mc Gaffin over 6 years ago in reply to Anderson2

TI__Mastermind 30000 points

When you change the voltage of the DCDC converter, do you do this by negotiating a new contract, or drop the DCDC voltage down to 15V when a 20V contract is still negotiated?

0 Anderson2 over 6 years ago in reply to Adam Mc Gaffin

Expert 1035 points

Yes, 20V contract is still negotiated even if VBUS voltage down to 15V.

0 Adam Mc Gaffin over 6 years ago in reply to Anderson2

TI__Mastermind 30000 points

Hello Anderson,

That should not be the case as our device should recognize that as an under voltage event, and enter into error recovery by disabling the power path. Would you be able to walk me through in detail your test procedure and provide any relevant scope captures of this event occurring?

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TPS65987D: UVP with PP3