| 摘要 |
PROBLEM TO BE SOLVED: To provide an overcurrent protection circuit for a switching power circuit which has an automatic recovery function in a small circuit scale.SOLUTION: The overcurrent protection circuit for a DC-DC converter 10 includes: a capacitor 31 connected to an external terminal SS; a charge circuit 32 for charging the capacitor 31; a discharge circuit 33 for discharging the capacitor 31; and a control circuit 20 for controlling the operation of the charge circuit 32 and the discharge circuit 33 and switching action of a switching element SW of the DC-DC converter 10. The control circuit 20 includes a hysteresis type comparator 21, and an RS flip-flop circuit 26 configured to be set in response to an overcurrent detection signal OCP_SD and an output signal COMP_OUT1 of the comparator 21 and be reset in response to the output signal COMP_OUT1 of the comparator 21. |
