Abstract: A controller of a synchronous rectifier of a synchronous flyback converter is presented. The synchronous rectifier includes a switch that is switchable by the controller. The controller includes an adaptive slew rate detection circuit that is configured to add a current to a base slew rate current depending on an off-time of the switch to obtain a slew rate current. The slew rate current determines a slew rate setting voltage. The controller is configured to turn on the switch of the synchronous rectifier depending on the slew rate setting voltage.

Abstract: An electronic rectifier circuit for adaptive gate voltage regulation of a synchronous rectifier field-effect transistor is provided, the electronic rectifier circuit is configured to clamp a drain-source voltage of the SR FET to a first regulation voltage while the SR FET is switched on for less than a threshold time in a current switching cycle, and the electronic rectifier circuit is configured to clamp the Vds of the SR FET to a second regulation voltage while the SR FET is switched on for more than the threshold time in the current switching cycle, the threshold time is configured as a portion of time that the SR FET was switched on in one or more previous switching cycles, and Vreg2 is smaller than Vreg1.

Abstract: An LED driver includes a current driver receiving a reference voltage providing a charging current for driving channel output(s) of an LED panel. A pre-charge circuit includes a voltage selector having a first and second select input, a control input receiving a pre-charge voltage select signal based on a next ON/OFF state that is after a current sub-period, and a voltage selector output for switchably outputting a higher voltage level (V_H) when the next state is OFF and a lower level (V_L) when the next state ON. An enable circuit has an enable input receiving an enable signal active during a break time of the current sub-period for driving the channel output when enabled with a pre-charge current to V_H or a relatively higher voltage level when the next state is OFF, and to V_L or a relatively lower voltage level when the next state is ON.

Abstract: An LED driver includes a current driver receiving a reference voltage providing a charging current for driving channel output(s) of an LED panel. A pre-charge circuit includes a voltage selector having a first and second select input, a control input receiving a pre-charge voltage select signal based on a next ON/OFF state that is after a current sub-period, and a voltage selector output for switchably outputting a higher voltage level (V_H) when the next state is OFF and a lower level (V_L) when the next state ON. An enable circuit has an enable input receiving an enable signal active during a break time of the current sub-period for driving the channel output when enabled with a pre-charge current to V_H or a relatively higher voltage level when the next state is OFF, and to V_L or a relatively lower voltage level when the next state is ON.