Patent ID: 8570020
Filing Date: 2013-10-29
Classification: H02M

Abstract:
1. A frequency control circuit for a non-constant frequency voltage regulator including a constant-time trigger to trigger a constant on-time or a constant off-time for a pulse width modulation signal, a current generator to provide a first current for the constant-time trigger to determining a width of the constant on-time or the constant off-time, and a power output stage operated by the pulse width modulation signal to generate a load current, the frequency control circuit comprising: a current detector connected to the power output stage, for feeding back a second current representative of a magnitude of a DC component of the load current; and an adder connected to the current generator, the current detector and the constant-time trigger, for adding the second current to the first current to adjust the width of the constant on-time or the constant off-time for frequency compensation to the pulse width modulation signal.