Reduction of audible noise in a power converter

A power converter, comprising:

• an energy transfer element coupled between an input of the power converter and an output of the power converter;
• a power switch coupled to the energy transfer element and the input of the power converter;
• a sense circuit coupled to generate a feedback signal representative of the output of the power converter;
• and
• a controller coupled to the power switch, wherein the controller includes:
• a drive circuit coupled to generate a drive signal to control switching of the power switch of the power converter in response to a current sense signal representative of a current through the power switch, and in response to a feedback signal, to control a transfer of energy from through the energy transfer element from the input of the power converter to the output of the power converter;
• a current limit generator coupled to generate a current limit signal responsive to a load coupled to the output of the power converter, wherein the drive circuit is coupled to generate the drive signal further in response to the current limit signal;
• an audible noise detection circuit coupled to receive the drive signal to generate a frequency skip signal in response to the drive signal to indicate when an intended frequency of the drive signal is within an audible noise frequency window, wherein a state of the current limit signal generated by the current limit generator is coupled to be fixed when the frequency skip signal indicates that the frequency of the drive signal is within the audible noise frequency window;
• and
• a first latch coupled to generate a hold signal coupled to control the current limit generator to hold the current limit signal, wherein the first latch is coupled to generate the hold signal in response to the frequency skip signal generated by the audible noise detection circuit, and in response to the feedback signal representative of the output of the power converter.