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Original question:

TPS65131: USB-C VBUS protection

TPS65131: USB-C VBUS protection

Benjamin
Prodigy 250 points
Part Number: TPS65131

Hello,

Sorry if that part number is irrelevant. I tried asking this question already, but was assigned to the product manager for TPS65131 who suggested I ask again with a different part number. I would love help from someone who understands USB-C Standards and real world failure scenarios.


I have device which is powered by 5V from the VBUS line of a standard USB-C charger. It works well, but I’m not 100% familiar with USB power standards, or what possible failures could occur in the real world.
I want customers to be able to power it from any compatible USB-C port.
Relays current draw: 120mA
TPS65131 current draw: 660mA
Total current draw: 780mA

My questions are:

1. What (if any) protection do I need on the in coming VBUS line? I have installed a PTC and TVS Diode, but I'm not sure how helpful that is in this situation.

2. Is the flyback diode across the Relay coils enough protection for the power host?

Thanks

- Ben