Abstract: A steady state frequency control circuit for a variable frequency regulator including an open loop frequency control circuit, a frequency detector and a comparator circuit. The variable frequency regulator provides a clock signal indicating actual operating frequency and has a frequency control parameter for adjusting steady state operating frequency. The frequency detector receives the clock signal and provides a frequency sense signal which is compared with a steady state frequency reference signal to provide a frequency adjust signal. The frequency control parameter is adjusted by the frequency adjust signal to control steady state frequency.

Abstract: A controller for a switching regulator is disclosed including a sense circuit, an error amplifier circuit, a filter and reference circuit, and a comparator circuit. The switching regulator includes a pulse switch circuit coupled to an output inductor for developing an output voltage. The sense circuit provides a sense signal indicative of current through the output inductor. The error amplifier circuit develops an error signal indicative of error of the output voltage. The filter and reference circuit high pass filters the sense signal to provide a filtered sense signal, and references the filtered sense signal and the error signal to a common DC level. The comparator circuit develops a pulse control signal used to control switching of the pulse switch circuit based on comparing the error signal with the filtered sense signal.

Abstract: A steady state frequency control circuit for a variable frequency regulator including an open loop frequency control circuit, a frequency detector and a comparator circuit. The variable frequency regulator provides a clock signal indicating actual operating frequency and has a frequency control parameter for adjusting steady state operating frequency. The frequency detector receives the clock signal and provides a frequency sense signal which is compared with a steady state frequency reference signal to provide a frequency adjust signal. The frequency control parameter is adjusted by the frequency adjust signal to control steady state frequency.