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UCC28063A: how to support CC mode and Vout will not arise when high current

Part Number: UCC28063A

Hi team,

My customer is using the UCC28063A EVM to do some tests. The customer do 0.1A-4A load transient, 5ms on (4A) 1s period to support huge current.

when 4A on, the Vout drop the current can support 4A. But the real test result is the device only support 2ms, then the current will decrease, the Vout will increase.

i have let them modify the compensation circuit slower, but still cannot solve the problem. Do you have some ideas how to achieve the function? Thanks.

Ch3:Vout   ch4:Iout