A daptive high efficiency LED backlight drive control circuit
Aiming at the problem of additional power loss caused by different LED conduction voltage drop,a multi-channel LED backlight drive control circuit with adaptive control is designed.Through adaptive control,the voltage on the linear current regulator is minimized.Based on 0.18 μm BCD process,a linear current regulator suitable for adaptive control is built,which can realize linear adjustment of channel current from 0 to 48 mA,and the current resolution is 0.2 mA.At different process angles and temperatures,the error of full current range is less than 0.1%,and the layout area is 0.504 mm2.The simulation results show that when the channel current is 20 mA,the power efficiency of the three-channel LED drive circuit with adaptive control is 95.2%,and the power loss of the linear current regulator is reduced by 74%.
LED driveradaptive controllinear current regulatorhigh efficiency
万方数据
维普
