Automatic PWM controlled driver circuit and method

Details Automatic PWM controlled driver circuit and method Automatic PWM controlled driver circuit and method

2008-04-15

2008-04-15

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S246000, C315S224000, C315S307000, C315S291000

Reexamination Certificate

active

07358683

ABSTRACT:
A load driver circuit includes an output transistor configured to drive a load. The circuit further includes a power supply, and a power supply evaluation circuit configured to sense a characteristic of the power supply, and generate a control signal in response thereto. In addition, a controller circuit is provided and is configured to drive the output transistor with a pulse width modulation signal coupled to the control terminal, wherein a duty cycle of the pulse width modulation signal is a function of the control signal of the power supply evaluation circuit.

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Freescale Semiconductor, Inc. Motorola Semiconductor Technical Data, “Advance Information, Automotive Dual High Side Driver”, MC33286, © Motorola, Inc., 2001, 8 pgs.

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