DC-DC CONVERTER CONTROL CIRCUIT, DC-DC CONVERTER, POWER SUPPLY UNIT, AND DC-DC CONVERTER CONTROL METHOD

摘要

A DC-DC converter, a power supply for the DC-DC converter, and a method and a circuit for controlling the DC-DC converter are provided to maintain a voltage relation between the output voltage of one DC-DC converter and the output voltage of other DC-DC converter when one of a plurality of DC-DC converters is defective. DC-DC converters(DC1G,DC2G) output plural output voltages. A voltage corresponding to a first output voltage(Vout1) is inputted to a first polarity input terminal of an error amplifier(ERA1G). A reference voltage for setting a target value for the first output voltage is inputted to a first input terminal of a second polarity of the error amplifier. A second voltage corresponding to a second output voltage(Vout2) is inputted to a second input terminal of a second polarity of the error amplifier. The error amplifier amplifies a voltage difference between a lower voltage which is obtained from the first input terminal of the second polarity and the second input terminal of the second polarity and the voltage applied on the first polarity input terminal.