Abstract: An example controller for a power supply includes a drive signal generator and a compensation circuit. The drive signal generator is to be coupled to control switching of a switch included in the power supply to regulate an output voltage of the power supply in response to a sensed output voltage such that the output voltage of the power supply is greater than an input voltage of the power supply. The compensation circuit is coupled to the drive signal generator and is also coupled to output an offset current to adjust the sensed output voltage in response to the input voltage of the power supply.

Abstract: An example controller for a power supply includes a drive signal generator and a compensation circuit. The drive signal generator is to be coupled to control switching of a switch included in the power supply to regulate an output voltage of the power supply in response to a sensed output voltage such that the output voltage of the power supply is greater than an input voltage of the power supply. The compensation circuit is coupled to the drive signal generator and is also coupled to output an offset current to adjust the sensed output voltage in response to the input voltage of the power supply.

Abstract: An example controller for a power supply includes a drive signal generator and a compensation circuit. The drive signal generator is to be coupled to control switching of a switch included in the power supply to regulate an output voltage of the power supply in response to a sensed output voltage such that the output voltage of the power supply is greater than an input voltage of the power supply. The compensation circuit is coupled to the drive signal generator and is also coupled to output an offset current to adjust the sensed output voltage in response to the input voltage of the power supply.

Abstract: A commutation control circuit for a conventional brushless DC motor. The circuit reduces power supply noise normally induced when current is switched from one pair of motor windings to the next. The motor conventionally includes a number of windings, each of which includes a terminal connected to a common center tap. The commutation circuit includes a first voltage-controlled current switch that is connected to the second terminal of a first one of the windings to control current through the first winding. Similarly, the second terminal of a second on of the windings is connected to a second voltage-controlled current switch. When a commutation is initiated to switch the current flow from the first to the second winding, the commutation circuit turns the second voltage-controlled switch fully on to quickly increase the current level through the second winding.

Abstract: A commutation control circuit provides a substantially periodic series of commutation signals to a conventional motor sequencer. The control circuit includes a frequency-to-current converter that receives the series of commutation signals and outputs a current that has a magnitude proportional to the average period of the series of commutation signals. The proportional current is then used to charge and/or discharge a known capacitance after a back-EMF sensor determines the appropriate starting time of a delay period. The capacitance and the proportional current are selected such that the proportional current charges the capacitance to a selected voltage level to trigger a commutation signal after the appropriate delay period.