一款應用于LED驅動的過溫保護電路
發(fā)布時間：2018-09-11 19:11
【摘要】：設計了一款電壓隨溫度自適應變化,從而使驅動電流隨溫度自適應變化的過溫保護電路。應用于LED驅動電路,具有滯回關斷的特點,在恒流輸出中增加溫度自適應模塊,設計簡單而且比較穩(wěn)定�；�0.5μm CMOS工藝,使用Cadence Spectre對電路進行仿真。仿真結果表明,基準電壓精度高,溫漂低,溫度系數(shù)為1.6×10~(-5)/℃;LED電路在0~65℃,恒定輸出350 mA,輸出變化范圍小于0.285%;在65~108℃范圍內變化時,電流輸出自適應范圍為85 mA;在溫度達到110℃時,關斷信號為高電平,電路關斷輸出,直到溫度下降到60℃時,電路重新開啟。
[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，
本文編號：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，
本文編號：2237619
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