Design of a novel LED driver for dual loop charge pump

作者：Wang Hui^*; Wang Songlin; Guo Baolong; Ye Qiang

来源：Journal of Huazhong University of Science and Technology (Natural Science Edition), 2010, 38(11): 11-15.

• Charge pump
• Current loop
• Dual-loop feedback
• Input noise
• LED drivers
• Voltage loop

To overcome high input noise and big output ripple under different operational mode in the charge pump of LED driver, a dual loop feedback control solution is designed and realized based on TSMC 0.6 μm BCD process. Multi gain operational mode of the voltage out loop, which can improve the efficiency under different voltage input. By replacing traditional adjustable resistance with current mirror in current inner loop, the low noise linear control mode is achieved. By combining the two control solution, not only the peak current of power can be effectively decreased, but also the output ripple of the charge pump, thus the input and output noise be brought down. The experiment result shows that the proposed control solution is feasible. The designed circuit can reach up to 90.1% efficiency under the condition of the LED of forward turn-on voltage 3.4 V, 3.0~4.4 V voltage swing, 3.6 V output voltage and 400 mA output current.

• 出版日期2010
• 单位西安电子科技大学