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LM3481: Design review

Part Number: LM3481

Hello Guys,

Our customer designed a regulator with the LM3481 on WEBENCH (attached the design). With no load all works. With 4 Ohm load all works until the input voltage drop under 10V ( attached some picture at 12V and 10V).

Any suggestion to fix the problem is greatly appreciated.

LM3481_design.zip

Art