Abstract: In one embodiment, a high voltage element is formed overlying a doped semiconductor region that can be depleted during the operation of the high voltage element includes a conductor overlying a space in a resistor.

Abstract: A power control system (25) uses two separate currents to control a startup operation of the power control system (25). The two currents are shunted to ground to inhibit operation of the power control system (25) and one of the two currents is disabled to minimize power dissipation. The two independently controlled currents are generated by a multiple output current high voltage device (12) responsively to two separate control signals (23,24).

Abstract: In one embodiment, a method of forming a high voltage element includes forming a sense element overlying at least a portion of a semiconductor substrate, and also includes operably coupling a first circuit to use a sense signal formed by the sense element for one of detecting a line under-voltage condition, detecting a line over-voltage condition, determining input power, limiting input power, power limiting, controlling standby operation, a line feed-forward function for current mode ramp compensation, regulating an output voltage, or detecting an energy transfer state of an energy storage element.

Abstract: In one embodiment, a temperature compensated current source includes a depletion mode transistor coupled in series with an active semiconductor device that adjust the depletion mode transistor to minimize variations in the current due to temperature changes.

Abstract: In one embodiment, a high voltage element is formed overlying a doped semiconductor region that can be depleted during the operation of the high voltage element includes a conductor overlying a space in a resistor.

Abstract: In one embodiment, a high voltage element is formed overlying a doped semiconductor region that can be depleted during the operation of the high voltage element includes a conductor overlying a space in a resistor.

Abstract: In one embodiment, a high voltage element is formed overlying a doped semiconductor region that can be depleted during the operation of the high voltage element.

Abstract: In one embodiment, a power supply controller is configured to reset or override a soft-start reference signal responsively to the output voltage decreasing to a value that is less than a desired regulated value of the output voltage.

Abstract: A power controller forms drive pulses that reduces audible noise under light load conditions.

Abstract: In one embodiment, a start-up controller for a PWM power supply controller is formed to generate a current that is substantially constant for changes in temperature and for changes in an output voltage received by the start-up controller.

Abstract: In one embodiment, a battery charger is configured to provide a normal charge current during a first time period and to supply a maintenance current after the first time period expires.

Abstract: In one embodiment, a power supply controller is configured to reset or override a soft-start reference signal responsively to the output voltage decreasing to a value that is less than a desired regulated value of the output voltage.

Abstract: In one embodiment, a high voltage element is formed overlying a doped semiconductor region that can be depleted during the operation of the high voltage element.

Abstract: A power control system (25) uses two separate currents to control a startup operation of the power control system (25). The two currents are shunted to ground to inhibit operation of the power control system (25) and one of the two currents is disabled to minimize power dissipation. The two independently controlled currents are generated by a multiple output current high voltage device (12) responsively to two separate control signals (23,24).

Abstract: A power control system (25) uses two separate currents to control a startup operation of the power control system (25). The two currents are shunted to ground to inhibit operation of the power control system (25) and one of the two currents is disabled to minimize power dissipation. The two independently controlled currents are generated by a multiple output current high voltage device (12) responsively to two separate control signals (23, 24).

Abstract: A power control system uses two separate currents to control a startup operation of the power control system. One of the currents has a small value and is used to charge an output voltage to an initial value. Once the initial value is reached, a second current that has a large value is used to charge the output voltage to an operating voltage value.

Abstract: A differential transistor (10, 25) includes a depletion mode transistor (15,30) that has a source connected to a source of an enhancement mode transistor (11,26). The gates of the depletion mode and enhancement mode transistors are driven differentially.

Abstract: A transistor (10, 30, 60) is formed to have a body contact (16, 36, 69) that has a minimal contact to the sides of the source region (14, 34, 63). This increases the density and reduces on-resistance of the transistor (10, 30, 60).

Abstract: A single input pin (48) provides multi-functional features for programming a power supply (10). By connecting the appropriate interface circuit (92, 100, or 112) to the single input pin (48), the power supply (10) is programmed for specific behaviors during power up and toggling of an on/off switch (96, 108). In one mode of operation a light emitting diode (106) in the interface circuit (100) is optically coupled to a microprocessor for signaling the closure of the on/off switch (108), allowing the microprocessor to control the power supply (10) through an opto-coupler (102). In another mode of operation, the single on/off switch (96) controls the power supply (10). In yet another mode of operation, Zener diode (118) in the interface circuit (112) controls the power supply (10) during brown-out and black-out conditions.

Abstract: A single input pin (48) provides multi-functional features for programming a power supply (10). By connecting the appropriate interface circuit (92, 100, or 112) to the single input pin (48), the power supply (10) is programmed for specific behaviors during power up and toggling of an on/off switch (96, 108). In one mode of operation a light emitting diode (106) in the interface circuit (100) is optically coupled to a microprocessor for signaling the closure of the on/off switch (108), allowing the microprocessor to control the power supply (10) through an opto-coupler (102). In another mode of operation, the single on/off switch (96) controls the power supply (10). In yet another mode of operation, Zener diode (118) in the interface circuit (112) controls the power supply (10) during brown-out and black-out conditions.