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TPS23753A: RTN open ervery 60ms

Part Number: TPS23753A
Other Parts Discussed in Thread: LM1117,

Dear Sir,

I have tried the APD port to Vout. It run OK.

But If change to VDD and VSS, VOUT can't work.

I have probed the RTN to VSS.

I think that RTN open every  60 ms as below pic.

Please help solve it.