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LM25183-LM25184DESIGN-CALC: LM25184 rated output power question

Part Number: LM25183-LM25184DESIGN-CALC

Hi Team,

Our customer is evaluating LM2584 and use design calculator below, 

7230.LM(2)518x PSR flyback converter quickstart tool revB.xlsx

Customer would like to understand the chart below, is it means switching frequency can only support 50KHz? 

Thanks & Regards

Eddie Chou