Patent ID: 8803499

Claim:
A method comprising: via control circuitry in a power supply: receiving an error signal, the error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage; and depending on the error signal, switching between: operating the control circuitry in a pulse width modulation mode to produce the output voltage, and operating the control circuitry in a pulse frequency modulation mode to produce the output voltage; the method further comprising: monitoring the error signal to detect a transient condition; prior to initiating switchover from the pulse width modulation mode to the pulse frequency modulation mode in response to the transient condition, utilizing a P-component, an I-component, and a D-component in a first circuit path in the control circuitry to operate in the pulse width modulation mode; in response to detecting the transient condition: i) utilizing the I-component in the first circuit path of a control loop to control a pulse width of a control signal generated by the control circuitry, ii) discontinuing use of the P-component and D-component in the first circuit path to control the pulse width, and iii) utilizing a P-component and D-component in a second circuit path of the control loop in conjunction with the I-component in the first circuit path of the control loop to operate in the pulse frequency modulation mode.