發(fā)布時(shí)間：2018-09-11 19:11

【摘要】：設(shè)計(jì)了一款電壓隨溫度自適應(yīng)變化,從而使驅(qū)動(dòng)電流隨溫度自適應(yīng)變化的過(guò)溫保護(hù)電路。應(yīng)用于LED驅(qū)動(dòng)電路,具有滯回關(guān)斷的特點(diǎn),在恒流輸出中增加溫度自適應(yīng)模塊,設(shè)計(jì)簡(jiǎn)單而且比較穩(wěn)定�；�于0.5μm CMOS工藝,使用Cadence Spectre對(duì)電路進(jìn)行仿真。仿真結(jié)果表明,基準(zhǔn)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(nèi)變化時(shí),電流輸出自適應(yīng)范圍為85 mA;在溫度達(dá)到110℃時(shí),關(guān)斷信號(hào)為高電平,電路關(guān)斷輸出,直到溫度下降到60℃時(shí),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(hào)：2237619