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Original question:

TPS65987D: 0x28 VBUS_OvpUsage accuracy

TPS65987D: OVP function

Anderson2
Expert 1035 points
Part Number: TPS65987D

According to the fallowing document,
In this test, the OVP was set to “Disconnect VBUS if voltage exceeds 5% of expected max. With a 5 V contract, the expected max is 5 V + 5% = 5.25 V.

But vSafe5V MAX is 5.5V. It is higher than "the expected max". This can't meet the USB PD 3.0 specification.
Even if the OVP is set to “Disconnect VBUS if voltage exceeds 15% of expected max", the expected max is 5 V + 15% = 5.75V.
According to the following thread, the tolerance is 5%. The minimum of "the expected max" is 5.75 - 5% = 5.4625V.
These voltage also can't meet the PD 3.0 spec.
5.75V < vSrcValid MAX
5.4625 < vSafe5V MAX, vSrcValid MAX

Would you tell me why "the expected max" cannot meet the spec and how to solve it?

  • 0
    TI__Mastermind 36756 points

    Hi Anderson,

    The TPS65987D has received USB PD3.0 compliance certification and is aligned with the latest PD spec. Please note that the OVP voltage can be adjusted based on what is acceptable for your system. You can always set OVP to "Disconnect VBUS if voltage exceeds OVPTripPoint" and set your trip point exactly to your desired point.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,
    Eric