Techniques for controlling a power converter using multiple controllers

A controller configured for use with a power converter and a power switch comprising:

• a primary controller coupled to the power converter and configured to provide a switch drive signal to control switching of the power switch to transfer energy from a primary side to a secondary side of the power converter, wherein the primary controller further comprises:
• a primary switching pattern circuit configured to provide a primary switching pattern to operate the primary controller in a first mode of operation;
• and
• a primary switch control circuit coupled to the primary switching pattern circuit and configured to receive a control signal representative of turn-on of the power switch, to receive the primary switching pattern, and to output the switch drive signal, wherein the primary switch control circuit operates in a first mode, a second mode, and a transition, wherein the primary switch control circuit outputs the switch drive signal in response to the primary switching pattern in the first mode, and wherein the primary switch control circuit operates in the second mode after the transition has been completed, wherein the primary switch control circuit outputs the switch drive signal in response to the control signal in the second mode.