POWER CONTROLLER WITH PULSE SKIPPING

摘要

A controller for a power converter includes a drive circuit coupled to generate a drive signal in response to an error signal representative of a load of the power converter. The drive circuit includes a pulse skipping circuit coupled to generate a blanking signal in response to the error signal. The pulse skipping circuit includes an enable circuit and a blanking circuit. The enable circuit is coupled to output an enable signal in response to the error signal. The blanking circuit is coupled to output the blanking signal in response to the enable signal and a ramp signal. The ramp signal is generated in response to the error signal. A duration of the blanking signal corresponds to a length of time for the ramp signal to reach a reference signal. The length of time is responsive to the error signal.

主权项

1. A controller for a power converter, the controller comprising:
a drive circuit coupled to generate a drive signal in response to an error signal representative of a load of the power converter, wherein the drive signal controls switching of a power switch of the power converter, and wherein the drive circuit includes a pulse skipping circuit coupled to generate a blanking signal in response to the error signal, the pulse skipping circuit including:
an enable circuit coupled to output an enable signal in response to the error signal, wherein the enable signal is representative of a condition of the load of the power converter; anda blanking circuit coupled to output the blanking signal in response to the enable signal and a ramp signal, wherein the ramp signal is generated in response to the error signal, wherein a duration of the blanking signal corresponds to a length of time for the ramp signal to reach a reference signal, and wherein the length of time of the ramp signal is responsive to the error signal.