Variable Control Voltage Output Voltage Adjust
This method is accomplished by connecting a variable control voltage through a resistor, R(adjust), to J3−1.
The equations provided below calculate R2 and R(adjust) where:
For example, if VO,max= 19 V, VO,min = 17 V, V(adjust),min = 0 V, V(adjust),max = 3.3 V, and R1 = 1 MΩ,
then R2 = 72.4 kΩ, and R(adjust) = 1.65 MΩ.
When V(adjust) = 0 V then VO = 19 V. When V(adjust) = 3.3 V then VO = 17 V.