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TPS55010: TPS55010 not output

Part Number: TPS55010


customer use TPS55010 for 5V to 5V convert and found some board not output and some board is ok.

Check the SS pin, the voltage is about 0V, EN pin voltage is 2.5V, fault pin is 5V, I don't know why SS pin is 0v?

I also want to know the work sequence of TPS55010. The first is charge SS capacitor and device start work, right?

look forward your reply.