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UCG28826: high efficiency aux power solution

Part Number: UCG28826
Other Parts Discussed in Thread: UCC28781

Tool/software:

Customer was looking for a high efficiency flyback solution for 24W (12V/2A). 

Their efficiency requirement is larger than 88% at 25%, 50%, 75% and 100% load conditions. 

Could you please help check which solution can meet their requirement?