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LMR33630-Q1: frequency foldback

Part Number: LMR33630-Q1

Hello, 

Could you let me know the reason why frequency foldback is affected by the load in fig 19 in LMR33630-Q1 datasheet?

Apart from keeping the output voltage stable across a wide input range, are there any other benefits of adding frequency foldback feature? Some of our competitors don't have this feature.

Thanks.

Dongbao