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A simpler way to generate two different voltages for DVS is to use a control voltage, VC, to inject current into the feedback network through an additional resistor. Adjusting the duty cycle of the control voltage varies its average DC level. A single control voltage and resistor can thus be used to adjust the output voltage. The equations shown here are used to calculate the values of resistors R2 and R3.

PTM Published on: 2008-04-16