一种高精度高转换效率的LED驱动电路
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摘要
基于HHNEC 0.35μm 40 V BCD工艺,采用峰值电流检测模式的脉冲宽度调制方式,设计了一款能在8～42 V的输入电压范围内,-40～125℃的温度范围内正常工作的高转换效率、高输出电流精度的发光二极管(LED)驱动电路,版图面积为925.3μm×826.8μm。利用带负反馈的预稳压电路为基准源电路和线性稳压器提供稳定的工作电压,新颖求和型CMOS基准电流源提供低温漂、高精度的偏置电流,带预抑制电路的基准电压源提供高精度的参考电压,提高了输出电流的精度。仿真结果表明,在典型工艺角TT下,当输入电压为40 V,驱动9个LED,输出电流为400 mA时,该LED驱动电路转换效率为95.8%,输出电流精度为1.75%。
A light emitting diode(LED) driver circuit with high conversion efficiency and high output current precision was designed based on HHNEC 0.35 μm 40 V BCD process and pulse width modulation of peak current detection mode. The LED driver circuit can work normally with an input voltage range of 8-42 V in the temperature range of-40-125 ℃. The layout area is 925.3 μm×826.8 μm. The prestabilized circuit with negative feedback was used to provide stable operating voltage for reference source circuit and linear regulator.The novel summation CMOS reference current source was use to provide the bias current with low temperature drift and high precision. And the reference voltage source with pre-suppression circuit was use to provide the reference voltage with high precision which improves the accuracy of the output current. The simulation results show that the conversion efficiency of the LED driver circuit is 95.8%, and the output current precision is 1.75% under the typical TT process corner, when the input voltage is 40 V, driving 9 LEDs, and the output current is 400 mA.
A light emitting diode(LED) driver circuit with high conversion efficiency and high output current precision was designed based on HHNEC 0.35 μm 40 V BCD process and pulse width modulation of peak current detection mode. The LED driver circuit can work normally with an input voltage range of 8-42 V in the temperature range of-40-125 ℃. The layout area is 925.3 μm×826.8 μm. The prestabilized circuit with negative feedback was used to provide stable operating voltage for reference source circuit and linear regulator.The novel summation CMOS reference current source was use to provide the bias current with low temperature drift and high precision. And the reference voltage source with pre-suppression circuit was use to provide the reference voltage with high precision which improves the accuracy of the output current. The simulation results show that the conversion efficiency of the LED driver circuit is 95.8%, and the output current precision is 1.75% under the typical TT process corner, when the input voltage is 40 V, driving 9 LEDs, and the output current is 400 mA.
引文
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[10] 肖倩倩,杨维明,鲍钰文.负电荷泵LED驱动芯片的设计与实现[J].半导体技术,2017,42(10):726-731,778.XIAO Q Q,YANG W M,BAO Y W.Design and implementation of a negative charge pump LED driver chip [J].Semiconductor Technology,2017,42 (10):726-731,778 (in Chinese).
[2] IBRAHIM M,CHOWDHURY S A.High efficient LED light driver circuit with temperature compensation for SHS [C]// Proceedings of the 3rd International Conference on the Developments in Renewable Energy Technology (ICDRET).Dhaka,Bangladesh,2014:1-4.
[3] ZHAN T,MA J,YI X Y,et al.Wireless-driven LED semiconductor lighting system [C]// Proceedings of the 11th China International Forum on Solid State Lighting.Guangzhou,China,2014:13-16.
[4] 徐瑶,杨维明,鲍钰文.基于恒定开关频率DC-DC变换器的大功率LED驱动芯片[J].固体电子学研究与进展,2015,35(1):88-93.XU Y,YANG W M,BAO Y W.Design of a high power LED driver based on constant switching frequency DC-DC converter [J].Research & Progress of SSE,2015,35(1):88-93 (in Chinese).
[5] 陶亮,曾以成,武世明.一种具有新型过温保护功能的LED恒流驱动电路[J].太赫兹科学与电子信息学报,2015,13(4):659-664.TAO L,ZENG Y C,WU S M.Design of constant current driver of LED circuit with late-model over-temperature buffer protection [J].Journal of Terahertz Science and Electronic Information Technology,2015,13(4):659-664 (in Chinese).
[6] 傅敏,嵇保健,黄胜明,等.新型大功率LED恒流驱动芯片设计[J].电子技术应用,2016,42(7):38-41.FU M,JI B J,HUANG S M,et al.Design of constant-current control chip for driving high-power LED [J].Application of Electronic Technique,2016,42(7):38-41 (in Chinese).
[7] 唐俊龙,周斌腾,谢海情,等.一种低温漂低电源电压调整率的基准电流源[J].微电子学,2016,46(5):628-631.TANG J L,ZHOU B T,XIE H Q,et al.A current refe-rence source with low temperature drift and low line regulation [J].Microelectronics,2016,46(5):628-631 (in Chinese).
[8] 吴娜,冯全源,邸志雄.一种宽恒流范围数字控制LED驱动电路[J].微电子学,2018,48(2):203-206,215.WU N,FENG Q Y,DI Z X.A digital controlled LED driver with wide constant current range [J].Microelectronics,2018,48(2):203-206,215 (in Chinese).
[9] 吴嘉士,黄继伟,张荣晶,等.一种宽电压输入范围电流可调型LED恒流驱动芯片设计[J].中国集成电路,2015,14(1/2):39-43,83.WU J S,HUANG J W,ZHANG R J,et al.Design of a LED driver with a wide input voltage and a adjustable current [J].China Integrated Circuit,2015,14(1/2):39-43,83 (in Chinese).
[10] 肖倩倩,杨维明,鲍钰文.负电荷泵LED驱动芯片的设计与实现[J].半导体技术,2017,42(10):726-731,778.XIAO Q Q,YANG W M,BAO Y W.Design and implementation of a negative charge pump LED driver chip [J].Semiconductor Technology,2017,42 (10):726-731,778 (in Chinese).
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