Patent ID: 11899486
Assignee: ROHM CO., LTD.
Field: Control (Instruments)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 12:
13. A synchronous step-down PWM controller comprising:
a controller configured to control:
a first switch having a first terminal connected to an application terminal to which an input voltage is applied, and
a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied;

a current sense portion configured to sense a signal based on an on resistance of the second switch; and
an accumulating portion configured to accumulate information according to an output of the current sense portion,
wherein
the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of a switching power supply device and a reference voltage, and
the controller controls off timing of the first switch by comparing a first voltage and an output voltage of the error amplifier, the first voltage being a voltage reflecting the information accumulated by the accumulating portion.