Average current and frequency control

A power regulating device, comprising:

• a buck converter module configured, during an OFF period (tOFF) of a current operating cycle (n), to provide an output current that decreases to a load until a minimum current threshold is reached,
• the buck converter module having an operating frequency (F(n)) over two or more operating cycles equal to a target switching period.

A method for providing adaptive on-time control of a light emitting diode (LED) unit, comprising:

• monitoring an output voltage provided to a light emitting diode (LED) unit, the LED unit including, during a given operating cycle (n), an ON time (tON) and an OFF time (tOFF), the OFF time (tOFF) including a recover period (tD) followed by a second period during which an output current corresponds to a decreasing ramp function;
• determining, based on the output voltage, an output current provided to the LED unit;
• increasing, during the ON time (tON), the output current until a maximum current threshold is reached.