| 摘要 |
A switching power source apparatus includes a high-side MOSFET 11, a ramp signal generator 18 to generate a ramp signal, an amplitude signal generator 2 to generate an amplitude signal Comp corresponding to an amplitude of the ramp signal, a superposing circuit 3 to generate a superposed signal by superposing a second ramp signal on a first reference voltage, a first feedback controller 1 to control the ON timing and ON width of the high-side MOSFET, an overcurrent detector to detect if a current of an output load is an overcurrent, and an OFF timer 26 to determine a period during which the high-side MOSFET 11 is forcibly turned off and generate a forcible OFF signal. If an overcurrent is detected, the controller 1 turns off the high-side MOSFET, and according to the forcible OFF signal, forcibly turns off the high-side MOSFET 11 for the determined period. |
