发明申请
US20100289424A1 Methods and Circuits for LED Drivers and for PWM Dimming Controls
失效
LED驱动器和PWM调光控制的方法和电路
- 专利标题: Methods and Circuits for LED Drivers and for PWM Dimming Controls
- 专利标题(中): LED驱动器和PWM调光控制的方法和电路
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申请号: US12620589申请日: 2009-11-17
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公开(公告)号: US20100289424A1公开(公告)日: 2010-11-18
- 发明人: Ronald Chang , Chin-Chi Chang , Chung-Kuang Huang
- 申请人: Ronald Chang , Chin-Chi Chang , Chung-Kuang Huang
- 申请人地址: US CA San Jose
- 专利权人: LEPOWER SEMICONDUCTOR INC.
- 当前专利权人: LEPOWER SEMICONDUCTOR INC.
- 当前专利权人地址: US CA San Jose
- 主分类号: H05B37/02
- IPC分类号: H05B37/02 ; G05F1/46
摘要:
The present invention relates to methods for LED driver applications, comprising the steps: providing an input voltage, Vin; generating an output voltage, Vout, for driving a plurality of LED channels, wherein a boost converter is used to convert the input voltage Vin to the output voltage Vout; determining a lowest voltage, VLVS, from the LED channels; generating a comparator voltage, Vcomp, by comparing the lowest voltage of the channels, VLVS, with a feedback reference voltage, VFBREF, wherein the feedback reference voltage, VFBREF, and a LED current, ILED, for the LED channels are determined by a current ISET; generating a summed voltage, Vsum, for stabilizing the output voltage, Vout; and generating a PWM voltage, VPWM, as a function of the Vcomp and the Vsum to control the output voltage, Vout.
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