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My designed ADP2386 circuit doesn't work, output voltage can not be adjusted by MCU DAC.

My instrument design needs a power supply from 8V to 10V adjustable. ADP2386 is selected to implement this circuit. MCU inside DAC is used to to adjust the buck output voltage. Refer to below circuit snap. I changed the DAC ouput from 0.0V to 3.3V, but the buck output almost didn't change. What's the circuit problem?

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