Pulse width modulation (PWM) closed loop LED current driver...

Details Pulse width modulation (PWM) closed loop LED current driver... Pulse width modulation (PWM) closed loop LED current driver...

2011-08-09

2011-08-09

Tran, Anh Q (Department: 2819)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S291000, C315S299000, C315S308000

Reexamination Certificate

active

07994730

ABSTRACT:
Methods and systems for providing stable and accurate low noise DC reference voltage are described. In the described embodiments, a feedback controlled DC reference voltage supply provides a stable and well controlled sense current. The sense current is in turn used to produce a stable and well controlled light output from a light emitting diode (LED).

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Anonymous, “Vf Monitoring Circuit Improves System Efficiency for LED Backlighting in Monitor and TV Applications,” IP.com No. IPCOM000162000D, Dec. 12, 2007.

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