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UCC256403: UCC256403 -Issue in CC mode

Part Number: UCC256403

Dear Expert,

We are working on charger 650W Design using UCC256403.

We have CC CV control implemented using OPAMP. 

Voltage and current ripple are minimum during CV operation while we are getting more current ripple in CC mode.

We observed the Current waveform, current drops to Zero in-between and recover back. This is causing more ripple and fluctuation in output. 

What could be the possible cause for same?

Thank you, 

Regards  

Vikas