MOSFET DRIVER WITH REDUCED POWER CONSUMPTION

摘要

A power supply can be operated in a low power mode by adjusting the pulses provided to a power supply switch until a pulse resulting in a reduced amount of power that exceeds a minimum power threshold required by a load coupled to the power supply switch is identified. For each successive switching cycle, a pulse causing a lower power to be provided to the load is produced. When a pulse is produced that causes a power to be provided to the load that does not exceed the minimum power threshold required by the load, a subsequent pulse is produced that causes a greater power to be provided to the load than the previous pulse. If the greater power exceeds the minimum power threshold, the subsequent pulse is stored and similar pulses are provided for the remainder of the low power mode.

主权项

1. A method for operating a flyback switching power converter coupled to a load, the power converter comprising a MOSFET switch and a controller coupled to the MOSFET switch, comprising:
configuring the power converter to operate in a low power mode; generating, by the controller, a first driver pulse, an amplitude of the first driver pulse configured to partially discharge an output capacitance of the MOSFET switch; and generating, by the controller, a second driver pulse, an amplitude of the second driver pulse based on a feedback control signal representative of a voltage provided to the load.