A Multi-channel High Efficiency Boost LED Backlight Driver with High Dimming Ratio
- 10.2991/eia-17.2017.24How to use a DOI?
- LED driver; high dimming ratio; high efficiency
In recent years, the screen size and backlight brightness have been increased year by year in portable electronic equipment, which makes much more requirements for LED driver chips. A 3-channel boost LED driver with high efficiency is proposed, and it has 3 channels with 10 LED lights in each channel. The current flow in each channel can reach to 20mA. In order to improve the output efficiency of the chip, the on-resistance of the power MOS sampling method is used here. Thus can achieve powerless sampling. Direct PWM control method is used in the circuit to complete the dimming, which can achieve colorless output of the white light. The use of a dimming MOSFET and LDO in the circuit to further optimize the power consumption. The circuit is designed and simulated in CSMS 0.25um BCD technology. The input voltage range is 2.7V~5V. The maximum dimming output voltage is 36V. The final output efficiency of the chip can achieve 91.4%.The rising time of the LED current in the dimming circuit is about 192ns and the falling time is about 14ns. The maximum dimming ratio is 9000: 1 at 500Hz.
- © 2017, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Yong WANG AU - Baoxing DUAN AU - Yi LI AU - Ting LIU AU - Yintang YANG PY - 2017/07 DA - 2017/07 TI - A Multi-channel High Efficiency Boost LED Backlight Driver with High Dimming Ratio BT - Proceedings of the 2017 International Conference on Electronic Industry and Automation (EIA 2017) PB - Atlantis Press SP - 110 EP - 116 SN - 1951-6851 UR - https://doi.org/10.2991/eia-17.2017.24 DO - 10.2991/eia-17.2017.24 ID - WANG2017/07 ER -