STABILIZED POWER CIRCUIT, SUBBOARD FOR COMPUTER EQUIPPED WITH SAME, AND INFORMATION PROCESSOR

摘要

PROBLEM TO BE SOLVED: To prevent the whole system from being down by suppressing a rush current flowing to an output capacitor C1 for smoothing by a stabilized power circuit 11 mounted on a subboard of a computer when a power source 12 is turned on. SOLUTION: An LSI for the subboard needs to have a reset period when the power source is turned on and in this reset period, the LSI does not require large current consumption usually; even if the output current of a stabilized power circuit 11 is small, there is no deficiency in supply of the output current, so an input monitor circuit 19 charges an output capacitor C1 while setting the overcurrent protection value of an overcurrent protecting circuit 18 for a control transistor Q1 to a relatively small value in the reset period and puts it back to a normal value when the capacitor is fully charged a certain time later.