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TPS53659: TPS53655 output power down when from 73A load to no load

Yazhu Liu
Intellectual 1410 points
Part Number: TPS53659
Other Parts Discussed in Thread: TPS53655,

Hi Team,

I cannot enter the part number as TPS53655 so I enter TPS53659 which from the same product family, but the question is related to TPS53655.

Customer is using TPS53655+CSD95496, and when they're doing VRTT test, they observe the output power down phenomenon with "Fusion Degital Power Designer" when they change the load from 73A to no load. But with 72A load or less, everything is well and the power down won't happen, it will only happen when the load is larger than 73A. Please refer to the below picture for detail.

Load: 73A->0A, Vout will drop to 0V after we change to no load.

Load: 72A->0A, Vout stays.

Could you please give some comments on what may cause the power down? I can send you the schematic through email if needed.

Thanks.

Best Regards,

Livia