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Design and implementation of a high dimming ratio LED drive controller

Xu Xiaoru, Wu Xiaobo, Zhao Menglian and Yan Xiaolang

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Abstract: This paper presents a high dimming ratio light emitting diode (LED) drive controller chip with digital mode dimming (DMD). The chip is composed of a boost power converter and a dimming control block. A novel constant on time (COT) control strategy is proposed for boost converter to achieve high dimming ratio. In addition, a fast enough load transient response of the converter power stage ensures its high dimming ratio. The COT control circuit operates mainly based on two current-capacitor timers and a finite state machine (FSM). The LED drive controller chip is designed and fabricated in 1.5 mm bipolar CMOS-DMOS (BCD) process with a die area of 1.31×1.43 mm2. Experimental results show that the proposed LED drive system works well. And, as expected, the minimum LED dimming on time of 1.0 ms and the corresponding dimming ratio of 1000:1 at 1 kHz dimming frequency are successfully achieved.

Key words: BCD process boost converter COT control LED drive high dimming ratio

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    Received: 18 August 2015 Revised: 05 October 2008 Online: Published: 01 February 2009

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      Xu Xiaoru, Wu Xiaobo, Zhao Menglian, Yan Xiaolang. Design and implementation of a high dimming ratio LED drive controller[J]. Journal of Semiconductors, 2009, 30(2): 025010. doi: 10.1088/1674-4926/30/2/025010 Xu X R, Wu X B, Zhao M L, Yan X L. Design and implementation of a high dimming ratio LED drive controller[J]. J. Semicond., 2009, 30(2): 025010. doi: 10.1088/1674-4926/30/2/025010.Export: BibTex EndNote
      Citation:
      Xu Xiaoru, Wu Xiaobo, Zhao Menglian, Yan Xiaolang. Design and implementation of a high dimming ratio LED drive controller[J]. Journal of Semiconductors, 2009, 30(2): 025010. doi: 10.1088/1674-4926/30/2/025010

      Xu X R, Wu X B, Zhao M L, Yan X L. Design and implementation of a high dimming ratio LED drive controller[J]. J. Semicond., 2009, 30(2): 025010. doi: 10.1088/1674-4926/30/2/025010.
      Export: BibTex EndNote

      Design and implementation of a high dimming ratio LED drive controller

      doi: 10.1088/1674-4926/30/2/025010
      • Received Date: 2015-08-18
      • Accepted Date: 2008-07-09
      • Revised Date: 2008-10-05
      • Published Date: 2009-02-16

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