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TPS62130A: The TPS62130a cannot be started and there have no output when the load is 2A

Part Number: TPS62130A
Other Parts Discussed in Thread: TPS62135

INPUT:5-10V

OUTPUT:3.3V/2.5A

Question:

         The TPS62130a cannot be started and there have no output when the load is 2A, the duty cycle is very small . But after the output is be setup, the load can change form 0-2.5A,the work of tps26130a is normal

the sch is below