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Please recommend a buck converter with FB and COMP pins for Voltage controlled OUTPUT.

Applicaton requires 0-12Vdc, and 4A. But maybe I should choose one with higher voltage/current rating?

I want to find a buck with simple OPAMP for the FB and COMP pins, because I want to use that OPAMP to control the feedback loop. 

I want to apply a DAC signal to the FB pin so I can control the output voltage from an uC. The range is A to 12vdc. A is a number less than 12. lower the better.