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Highly accurate average current controller using charge sharing method for LED lamp driver

Highly accurate average current controller using charge sharing method for LED lamp driver

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An average current controller (ACC) that can accurately regulate the light-emitting diode (LED) forward current for lighting applications is proposed. The proposed ACC employs a charge sharing method to achieve a highly accurate average LED forward current by compensating for an error occurred when the LED forward current is sampled. It was fabricated using a 0.35 μm CMOS process technology and occupied a small chip area of 1028 μm × 728 μm. The measurement results showed that the proposed ACC achieved a deviation in the average LED forward current of <0.6% over the entire input voltage range while achieving a maximum power efficiency of 93.6%. Therefore, the proposed ACC is suitable for high-quality LED lighting systems requiring an accurate LED forward current.

References

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      • 3. Hwang, J.T., Cho, K., Kim, D., et al: ‘A simple LED lamp driver IC with intelligent power-factor correction’. Proc. of IEEE ISSCC, San Francisco, CA, USA, February 2011, pp. 236238, doi: 10.1109/ISSCC.2011.5746299.
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      • 4. Uprety, S., Chen, H., Ma, D.: ‘Quasi-hysteretic floating buck LED driver with adaptive off-time for accurate average current control in high brightness lighting’. Proc. IEEE ISCAS, Rio de Janeiro, Brazil, May 2011, pp. 28932896, doi: 10.1109/ISCAS.2011.5938236.
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