一种适用于LED驱动的高压稳压电路设计

发布时间：2018-07-09 18:29

  本文选题：LED驱动 + 高压稳压电路　； 参考：《电子技术应用》2017年03期

【摘要】：在LED驱动电路中,若采用传统的BUCK型DC-DC降压方式或利用MOS管级联钳制降压方式为芯片内部低压模块提供电源,存在不易集成化和受高压工艺限制等问题。为此,提出了一种改进的高压稳压电路,利用高压LDMOS构成电流源对RC电路充电,电容上的电压经过线性稳压器稳压后给芯片提供稳定的低压电源。该电路只需外置电容,其他部分均可集成在一块芯片上。基于华虹宏力0.5μm 700V BCD工艺对电路进行仿真验证,在0~311 V周期脉动高电压输入条件下,电路能稳定输出4.97 V;负载电流在0~10 mA范围内变化,负载调整率为11.6 mV/mA;在-40℃~130℃温度范围内,输出电压温度系数为27.2 ppm/℃。仿真结果表明,该高压稳压电路各指标参数均满足预期要求。
[Abstract]:In the LED drive circuit, if the traditional buck DC-DC step-down mode or the MOS tube cascade clamping mode is used to supply power to the low voltage module inside the chip, it is difficult to integrate and is limited by the high-voltage technology and so on. For this reason, an improved high voltage regulator circuit is proposed. The current source is composed of high voltage LDMOS to charge the RC circuit. The voltage on the capacitor is stabilized by a linear voltage regulator to provide a stable low voltage power supply to the chip. The circuit requires only external capacitors and the rest of the circuit can be integrated on a single chip. Based on Huahong Hongli 0.5 渭 m 700V BCD process, the circuit is verified by simulation. Under the input condition of 0 ~ 311V period pulsating high voltage, the circuit can output 4.97 V stably, and the load current changes in the range of 0 ~ 10 Ma. The load adjustment rate is 11.6mV / mA.The output voltage temperature coefficient is 27.2 ppm/ 鈩，

本文编号：2110282