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A cost-effective single-converter reconfigurable CMOS LED driver is proposed to accurately and adaptively bias RGB color LEDs. An automatic detection technique is developed to precisely detect the voltage difference between the red and green/blue LEDs regardless of the PVT variations. The fast -hopping technique is also implemented to instantaneously adjust the output voltage level,...
The article introduces an off-line constant current LEDs driver controller, using the HVLED, an innovative all-primary controller, by STMicroelectronics. Using the proprietary patented technique, the IC is able of providing a constant output current using primary sensing feedback, thus eliminating the need for the optocoupler, secondary voltage reference and current sensor, still maintaining quite...
This paper introduces a digitally-controlled off-line LED driver based on low-voltage series-input converter modules. The series-input connected modular architecture is adopted to utilize low-voltage high-frequency circuits and low-profile components in off-line applications. Input current is regulated to be constant using a simple controller to achieve 0.9 power factor (PF) without a traditional...
Since the high rise in luminous flux power LEDs have experienced in the last years, they have become an overcoming alternative to incandescent bulbs for automotive signal lamps, and even an interesting choice for automotive headlamps, as most recent prototypes has shown, since the performance is near to that of HID lamps. This rise in luminous flux is based on both higher efficiency and forward current,...
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