voltage of the synchronous buck regulator by adjusting the gate amplitude of a mosfet switch located in the power loop of the auxiliary output application_number US 39580499 A description the present invention is an extension of the idea developed by schwartz in the 1695 patent though schwartz 39 circuit works well it does not provide for maximum regulation of the auxiliary output voltage by providing an adjustable gate drive to the gate of switch 210 capable of modulating the gate amplitude as a function of output voltage error the regulation of the auxiliary output voltage can be radically improved to illustrate this point various cases in which the gate drive is driven at differing levels will be explored when the gate is not driven at all i e the voltage at the gate is substantially zero volts the mosfet in switch 210 degenerates into a silicon junction diode with a forward voltage drop of approximately 0 7 volts to 0 8 volts if on the other hand the mosfet is driven with a normal gate drive and fully enhanced i e the gate drive is high enough to force the mosfet into its ohmic region the forward drop on the switch drops to perhaps 0 05 volts to 0 1 volt this voltage drop depends on the on resistance of the specific mosfet and the amplitude of the gate drive a typical logic level mosfet is fully enhanced with approximately 5.