一种应用于LED驱动的新型过温保护电路
电子技术应用
文鑫1,冯全源1,程简2
1.西南交通大学 微电子研究所,四川 成都 611756;2.四川省科学技术厅,四川 成都 610016
摘要: 基于0.18 μm BCD工艺,设计了一种应用于LED驱动的新型过温保护电路。利用基于电流求和的Banba型带隙基准源来产生高低阈值电压,从而消除芯片在过温点附近的振荡现象,同时带隙基准源加入了高阶曲率补偿,提高了过温阈值点的精度。通过Cadence软件对该电路进行了仿真验证。结果表明,在-40℃~150 ℃的温度变化区间内,高低阈值电压的温度特性好,温度系数为2.9 ppm。当温度高于131.8 ℃时,能够触发过温保护;当温度低于109.4 ℃时,电路可恢复正常工作,迟滞量为22.4 ℃。该过温保护电路精度高,稳定性好,可应用于LED驱动芯片中。
中圖分類號:TN433 文獻(xiàn)標(biāo)志碼:A DOI: 10.16157/j.issn.0258-7998.233831
中文引用格式: 文鑫,馮全源,程簡. 一種應(yīng)用于LED驅(qū)動的新型過溫保護(hù)電路[J]. 電子技術(shù)應(yīng)用,2024,50(1):27-30.
英文引用格式: Wen Xin,F(xiàn)eng Quanyuan,Cheng Jian. A novel over-temperature protection circuit for LED driver[J]. Application of Electronic Technique,2024,50(1):27-30.
中文引用格式: 文鑫,馮全源,程簡. 一種應(yīng)用于LED驅(qū)動的新型過溫保護(hù)電路[J]. 電子技術(shù)應(yīng)用,2024,50(1):27-30.
英文引用格式: Wen Xin,F(xiàn)eng Quanyuan,Cheng Jian. A novel over-temperature protection circuit for LED driver[J]. Application of Electronic Technique,2024,50(1):27-30.
A novel over-temperature protection circuit for LED driver
Wen Xin1,Feng Quanyuan1,Cheng Jian2
1.Institute of Microelectronics, Southwest Jiaotong University, Chengdu 611756, China; 2.Science & Technology Department of Sichuan Province, Chengdu 610016, China
Abstract: In this paper, a new type of over-temperature protection (OTP) circuit for LED driver is designed. It is based on 0.18μm BCD process. In this paper, Banba′s bandgap reference based on current summing is used to generate high and low threshold voltage, to eliminate the oscillation phenomenon near the over-temperature point of the chip. The bandgap reference is added with high-order curvature compensation to improve the accuracy of the over-temperature threshold voltage. The circuit is simulated by Cadence software. The results show that the high and low threshold voltage has good temperature property, the temperature coefficient is 2.9 ppm in a temperature range of -40 ℃ to 150 ℃. When the temperature is higher than 131.8 ℃, OTP can be triggered. When the temperature is lower than 109.4 ℃, the circuit can return to normal operation, and the hysteresis quantity is 22.4 ℃. The OTP has high precision and stability, and can be applied to LED driver chips.
Key words : LED driver;over-temperature protection;thermal oscillation
引言
作為第四代的綠色光源,LED有著高效、環(huán)保、安全、節(jié)能等特點[1,2]。在我國大力發(fā)展節(jié)能經(jīng)濟(jì)的大背景下,LED產(chǎn)業(yè)將成為我國經(jīng)濟(jì)發(fā)展的重要組成部分[2]。LED的工作需要專門的LED驅(qū)動芯片,而芯片的長時間工作會使得電路的環(huán)境溫度升高,從而導(dǎo)致半導(dǎo)體器件的擊穿,降低LED的使用壽命[3,4]。因此,過溫保護(hù)電路成為了LED驅(qū)動芯片的一個必要的組成模塊。
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作者信息:
文鑫1,馮全源1,程簡2
(1.西南交通大學(xué) 微電子研究所,四川 成都 611756;2.四川省科學(xué)技術(shù)廳,四川 成都 610016)

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