초록 ▼

An efficient multiphase switching regulator uses sensed voltages to achieve accurate forced current sharing and programmable current sharing. The voltage waveforms at the input of respective inductors are low-pass filtered to produce sensed voltages which are proportional to the duty cycles of the r

An efficient multiphase switching regulator uses sensed voltages to achieve accurate forced current sharing and programmable current sharing. The voltage waveforms at the input of respective inductors are low-pass filtered to produce sensed voltages which are proportional to the duty cycles of the respective voltage waveforms. The sensed voltages are compared. The comparisons are used to adjust PWM circuits which control the duty cycles of the voltage waveforms of the respective inductors. Substantially identical sensed voltages at the inputs of identical inductors result in substantially identical output currents from respective inductors. The ratio of the output currents from respective inductors can be changed by adjusting a variable resistor that changes the fractions of respective sensed voltages being compared.

대표청구항 ▼

[ What is claimed is:] [7.]7. A method of programmable current sharing in a multiphase switching regulator comprising the acts of:converting a first voltage waveform and a second voltage waveform at respective input terminals of respective first and second inductors into respective first and second

[ What is claimed is:] [7.]7. A method of programmable current sharing in a multiphase switching regulator comprising the acts of:converting a first voltage waveform and a second voltage waveform at respective input terminals of respective first and second inductors into respective first and second sensed voltages, wherein said sensed voltages are proportional to average values of said respective first and second voltage waveforms;generating a first control voltage from a feedback voltage to control a duty cycle of the first voltage waveform, wherein said feedback voltage is proportional to an output voltage of said multiphase switching regulator; andgenerating a second control voltage from a comparison of fractional amounts of said first and second sensed voltages to control a duty cycle of the second voltage waveform, wherein at least one fractional amount is adjustable by a variable resistor.