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LM22678: LM22678-ADJ OUTPUT 12V5A fail

Part Number: LM22678
Other Parts Discussed in Thread: LM61460

  LM22678-ADJ is used, the input voltage range is 19V-28.8V, and the simulation with WEBENCH for 12V 5A output is failed.

Why?

How is it calculated?

Please recommend a material to achieve the input voltage range of 19V-28.8V, and output 12V 5A ----- minimum load of 3A;