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Design of White-LED driver based on current controlled mode
Author(s):
HONG Yi
,
ZOU Xue Cheng
,
LI Gao
,
YANG Han Bing
Pages:
62
-
64
Year:
2008
Issue:
7
Journal:
APPLICATION OF ELECTRONIC TECHNIQUE
Keyword:
PFM控制
;
低反馈电阻
;
升压
;
开关电源
;
Abstract:
设计了一款基于2μm bipolar工艺、应用于彩色LCD背光照明的白光LED驱动芯片.采用PFM控制模式、低反馈电阻及负载电流反馈技术实现芯片驱动的低功耗和恒流输出.系统仿真结果表明,负载电流为20mA时,输出电压纹波系数为0.013%/V,输出电流纹波系数为0.02mA/V,效率为80.1%;芯片版图面积为0.67mm×1.28mm.
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