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:] [5.]5. A multiphase switching regulator with forced current sharing comprising:at least a first inductor and a second inductor having respective input terminals and respective output terminals, said output terminals connected together;at least a first switch circuit connected

[ What is claimed is:] [5.]5. A multiphase switching regulator with forced current sharing comprising:at least a first inductor and a second inductor having respective input terminals and respective output terminals, said output terminals connected together;at least a first switch circuit connected to said input terminal of said first inductor and a second switch circuit coupled to said input terminal of said second inductor;at least one voltage source coupled to said first and second switch circuits;a controller to control operations of said first and second switch circuits to alternately connect said input terminals of the respective inductors to said respective voltage source and ground, and wherein said controller adjusts duty cycles of respective voltage waveforms across the respective inductors to achieve equal sensed voltages representative of respective voltages at the input terminals of the inductors;said controller comprises a control voltage circuit and at least two pulse-width modulation circuits;said control voltage circuit produces control voltages to control duty cycles of respective outputs of the respective pulse-width modulation circuits; andsaid control voltage circuit further comprises:an error amplifier configured to compare a feedback voltage proportional to an output voltage with a reference voltage;a first feedback amplifier configured to buffer output of said error amplifier and provide a first control voltage;an offset amplifier configured to compare a first sensed voltage with a second sensed voltage; anda second feedback amplifier configured to sum an output of said offset amplifier with an output of said error amplifier and provide a second control voltage.