hysteresis control type switching regulator of the control circuit and the hysteresis control type switching regulator which uses it, electronic equipment

摘要

PROBLEM TO BE SOLVED: To improve the line regulation of a hysteresis-controlled switching regulator.;SOLUTION: An output voltage V_OUT' divided by a first resistance R1 and a second resistance R2 is input into a first polarity input terminal of a comparator 22. A driver 20 controls a switching transistor M1 and a synchronous rectification transistor M2 according to an output pulse S1 of the comparator 22. A feedback circuit 24 outputs a switching signal S2 switching between two voltage levels of an input voltage V_IN and a ground voltage V_GND to the inverting input terminal of the comparator 22 according to the output pulse S1. An error amplifier 30 amplifies an error between the divided output voltage V_OUT' and a predetermined first reference voltage V_REF1 to generate a second reference voltage V_REF2, which is output to a second polarity input terminal of the comparator 22.;COPYRIGHT: (C)2012,JPO&INPIT