Patent attributes
A switching converter produces an output signal transmitted to a variable load impedance to produce a load voltage VDD across the load impedance and holds VDD close to a set point voltage VSP selected by control data DREF1 to compensate for variations in the load impedance which tend to drive VDD away from VSP. The switching converter includes a pulse-width modulated power converter for producing the output signal of voltage VOUT in response to an input signal of voltage VIN, wherein a ratio VOUT/VIN is a function of a duty cycle D1 of a pulse-width modulated signal VPWM1. A pulse-width modulation circuit generates the VPWM signal of duty cycle D1 controlled by a control signal, and a feedback control circuit monitoring the load voltage VDD adjusts D1 to keep the load voltage as close as possible to VSP. A power source supplies the input signal of voltage VIN to the power converter. Second control data supplied to the power source separately selects the value of VIN for each possible set point voltage VSP such that that the pulse-width modulate signal's duty cycle D1 remains as close a possible to a value for which circuit performance is substantially optimal with respect to a selected combination of performance criteria.
