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US 6,362,578 B1Granted
LED driver circuit and method
AssigneeSTMicroelectronics S.r.l.
InventorsDavid F. Swanson, Marcello Criscione
Life of this patent
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Abstract
An LED driver circuit and method are disclosed where an array of light emitting diodes have a transistor connected to each respective array of light emitting diodes. A PWM controller has an input for receiving a voltage reference and an output connected to selected transistors for driving selected transistors and setting a PWM duty cycle for the selected arrays of light emitting diodes to determine the brightness of selected light emitting diodes. An oscillator is connected to the PWM controller for driving the PWM controller.
Claims8
An LED drive module comprising:
- a transistor adapted to be connected to an array of light emitting diodes;
- a PWM controller having an input for receiving a voltage reference and an output connected to the transistor for driving the transistor and setting a PWM duty cycle for the array of light emitting diodes to determine the brightness of the light emitting diodes;
- an oscillator connected to the PWM controller for driving the PWM controller;
- and
- a feedback loop circuit connected to the array of light emitting diodes, including a switching controller and comparator circuit for comparing a reference and feedback for sensing and regulating load voltage.
2 more elements
Dependencies are inferred from the claim text.