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LM5117-Q1: VIN限流电阻发热

Part Number: LM5117-Q1
Other Parts Discussed in Thread: LM5117

初次应用LM5117,需要请教几个问题:

1:12v输出,当负载大于1A时,VIN的3.9 OHM限流电阻发热严重,直到烧毁,请问会是什么原因

2:需要做12V/20A输出,有哪些地方需要特别注意的?

希望有经验的同行指教。