CURRENT MODE CONTROL TYPE SWITCHING POWER SUPPLY DEVICE

摘要

A switching power supply device includes a first switch, a second switch, a current sensing portion configured to sense current flowing in the second switch, and a controller configured to control the first and second switches in accordance with the current sensed by the current sensing portion. The controller includes an accumulating portion configured to accumulate information of the current sensed by the current sensing portion during a predetermined period of time while the first switch is in the off state, and reflecting portion configured to start the transmission of the current information accumulated by the accumulating portion before the first switch is changed from the off state to the on state so as to reflect the current information accumulated by the accumulating portion on the slope voltage, and controls the first and second switches in accordance with the slope voltage.

主权项

1. A current mode control type switching power supply device comprising:
a first switch having a first terminal connected to a first application terminal to which an input voltage is applied; a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to a second application terminal to which a predetermined voltage lower than the input voltage is applied; a current sensing portion configured to sense current flowing in the second switch; and a controller configured to control the first switch and the second switch in accordance with the current sensed by the current sensing portion, wherein the controller includes an accumulating portion configured to accumulate current information sensed by the current sensing portion during a predetermined period of time while the first switch is in the off state, and a reflecting portion configured to start transmission of the current information accumulated by the accumulating portion before the first switch is changed from the off state to the on state so as to reflect the current information accumulated by the accumulating portion on a slope voltage, and the controller controls the first switch and the second switch in accordance with the slope voltage.