Controller for a switched mode power converter

A controller for a switched mode power converter having a switch, wherein the switched mode power converter can operate in a constant current and a constant voltage mode of operation, wherein the controller is configured to output a switch control signal for the switch and receive:

• a sensed voltage input signal;
• and
• a primary current input signal;
• wherein the controller comprises:
• a constant current mode controller configured to process the sensed voltage input signal and generate a plurality of output control signals for controlling at least one of peak current and switching frequency operational parameters of the switched mode power converter;
• a constant voltage mode controller configured to process the sensed voltage input signal and generate a plurality of output control signals for controlling at least one of the peak current and switching frequency operational parameters of the switched mode power converter;
• a primary peak current adjuster configured to process the primary current input signal and at least one of the output control signals from the constant current mode controller and the output control signals from the constant voltage mode controller in order to configure the switch control signal to turn off the switch;
• a switching frequency adjuster configured to process at least one of the output control signals from the constant current mode controller and the output signals from the constant voltage mode controller in order to configure the switch control signal to turn on the switch;
• and
• wherein the controller is configured to enable the constant current mode controller if the output control signals of the constant voltage mode controller represent operation with peak current and switching frequency at maximum values.