A novel DC and PWM dual-mode dimming circuit for the WLED driver

IEICE Electronics Express

Zhangming Zhu¹  Yue Niu¹  Lianxi Liu¹  Jiao Zou¹ 

[1] School of Microelectronics, Xidian University

关键词: WLED driver;    dual-mode;    DC dimming mode;    PWM dimming mode;   

DOI  :  10.1587/elex.10.20130579

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(6)Cited-By(1)It is very important for a light source that the brightness could be adjusted conveniently. A novel DC and PWM dual-mode dimming circuit for a monolithic WLED driver is proposed for the first time in this paper. It can alter flexibly the control mode between the analog (DC) and digital (PWM) dimming according to the input control signal. In the DC dimming mode, when the input DC control voltage is adjusted from 0.5V to 2.5V, the average output current can be changed from 20% to 100% of the nominal current value. While in the PWM dimming mode, the output current is proportional to the duty cycle of the input PWM signal and changed from about 0% to 100% of the nominal current value. The WLED driver with the proposed dual-mode dimming circuit has been verified in a 0.5μm HVCMOS process, and the nominal value could be set more than 1A by the external resistors.

【 授权许可】

Unknown