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@tage
There is a simpler way. Use one of the two DAC outputs and connect a resistor to the Feedback pin of the voltage regulator. Keep the resistor divider that determines the output voltage. if you set the DAC output at the same voltage as the Feedback pin, the output voltage is unchanged. if you set the DAC voltage higher there will be a small current flowing into the Feedback node. so the current in the top feedback resistor must decrease by the same amount. That means that the output voltage must decrease. and the other way around.