Independent Output Control for Single-Inductor, Bipolar Outputs, Buck-Boost Converters

摘要

A method of driving a power stage configured to provide both positive output voltage to a positive output and negative output voltage to a negative output, the method comprising: —generating a first control signal; —generating a second control signal; —operating, the first control signal so as to initiate a charging phase, such that a first duty cycle of the first control signal is controlling an amount of energy to be accumulated; —operating, simultaneously, the first control signal and the second control signal so as to initiate an independent discharging phase of the accumulated energy, in a buck-type or boost-type, to an output of the power stage such that a second duty cycle of the second control signal is controlling an amount of energy to be discharged.