RatnerPrestia
Switching control circuit, semiconductor device and switching power source apparatus
At the starting time and an overload time in which the output voltage of the switching power source apparatus is low, if an overcurrent state, in which the ON period of the switching device becomes short and a current not less than the current limit value of the switching device flows through the switching device, occurs, this overcurrent state is detected. The blanking period of a blanking pulse signal is made shorter than the blanking period that is obtained during steady operation, and the ON period of the switching device is made shorter. Hence, the device current flowing through the switching device can be made small in each pulse for the switching operation, and, at the same time, the device current is suppressed from increasing each time a pulse for the switching operation is generated.
Panasonic Corporation
H H
H02M H02M
inventional additional
Keita Yoshihiro Kazuhiro Naohiko
Kawabe Mori Murata Morota