| 主权项 |
1. A control method for controlling a switching regulator, wherein the switching regulator is for converting an input voltage to an output voltage or output current according to a PWM signal, and is capable of operating in continuous conduction mode (CCM), discontinuous conduction mode (DCM), or boundary conduction mode (BCM) which is between CCM and DCM, the control method comprising:
detecting the conduction mode in which the switching regulator is operating, and generating a mode signal indicating whether the switching regulator is operating in DCM or CCM; generating a control signal according to the mode signal; and adjusting On-time, Off-time, or frequency of the PWM signal according to the control signal such that the switching regulator operates in or near BCM, wherein when the switching regulator is operating in DCM, the control signal reduces the On-time or Off-time of the PWM signal, or increases the frequency of the PWM signal, such that the operation of the switching regulator moves from relatively farther to relatively closer to BCM; and when the switching regulator is operating in CCM, the control signal increases the On-time or Off-time of the PWM signal, or reduces the frequency of the PWM signal, such that the operation of the switching regulator moves from relatively farther to relatively closer to BCM. |
