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TPS25846-Q1: Risk assessment of short-circuit test

Colin Chen
Intellectual 485 points
Part Number: TPS25846-Q1
Other Parts Discussed in Thread: TPD4S480

Tool/software:

Dear Experts,

Our product designed based on TPS25846-Q1 currently needs to pass the GB/T 28046.2 standard test. The short-circuit protection test requires all input and output ports of TPS25846-Q1 to be connected to 32V voltage in sequence for 60 seconds. We noticed that the specification book specifies that the maximum voltage for USB data interfaces DM-OUT and DP-OUT is 6V, and the maximum voltage for DM-IN and DP-IN is 18V. Currently, it seems that the test cannot be passed. We would like to inquire if there is a way to pass the standard test and ensure communication quality. We look forward to your reply. Thank you

  • 0
    TI__Mastermind 42545 points

    Hello Colin,

    I am not familiar with the GB/T 28046.2 standard, but would using a USB Port Protection device with 48V short-to-VBUS, such as the TPD4S480, help pass this test? This is an non-auto device, but if this something like this could help pass the test, I can see what auto-grade options there are.

    Please note that although the TPD4S480's datasheet states it provides 4-channel short-to-VBUS OVP for CC1, CC2, SBU1, and SBU2, any of these can be replaced with DM and DP.

    BR,

    Seong