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Output adjustable inverting converter

Category: Hardware
Product Number: LT8364

Hi,

I will use LT8364 to design output voltage adjustable power rail from -17V to -24V. The below is my proposal.But I simulate the circuit by LT Spice, the DAC voltage change from 0 to 3V, the output voltage is no change, the feed back (VFB) volage as the DAC vollage change.

Could you kindly provide the suggestion?