一款应用于LED驱动的过温保护电路
发布时间：2018-09-11 19:11
【摘要】：设计了一款电压随温度自适应变化,从而使驱动电流随温度自适应变化的过温保护电路。应用于LED驱动电路,具有滞回关断的特点,在恒流输出中增加温度自适应模块,设计简单而且比较稳定。基于0.5μm CMOS工艺,使用Cadence Spectre对电路进行仿真。仿真结果表明,基准电压精度高,温漂低,温度系数为1.6×10~(-5)/℃;LED电路在0~65℃,恒定输出350 mA,输出变化范围小于0.285%;在65~108℃范围内变化时,电流输出自适应范围为85 mA;在温度达到110℃时,关断信号为高电平,电路关断输出,直到温度下降到60℃时,电路重新开启。
[Abstract]:An over-temperature protection circuit is designed, in which the voltage changes adaptively with temperature, so that the driving current changes adaptively with temperature. Applied to LED drive circuit, it has the characteristic of hysteretic turn-off. The temperature adaptive module is added to the constant current output, and the design is simple and stable. Based on 0.5 渭 m CMOS process, Cadence Spectre is used to simulate the circuit. The simulation results show that the reference voltage accuracy is high, the temperature drift is low, the temperature coefficient is 1.6 脳 10 ~ (-5) / 鈩，
本文编号：2237619
[Abstract]:An over-temperature protection circuit is designed, in which the voltage changes adaptively with temperature, so that the driving current changes adaptively with temperature. Applied to LED drive circuit, it has the characteristic of hysteretic turn-off. The temperature adaptive module is added to the constant current output, and the design is simple and stable. Based on 0.5 渭 m CMOS process, Cadence Spectre is used to simulate the circuit. The simulation results show that the reference voltage accuracy is high, the temperature drift is low, the temperature coefficient is 1.6 脳 10 ~ (-5) / 鈩，
本文编号：2237619
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