本文選題：LED驅動 + 調光技術��； 參考：《電子科技大學》2014年碩士論文

【摘要】：隨著半導體行業(yè)高速發(fā)展,第三代電光源LED半導體照明技術應運而生,LED相對于傳統(tǒng)電光源具有光效高、壽命長、環(huán)保等特點,吸引了業(yè)內外人士的廣泛關注,政府也給予了對LED產業(yè)的支持相關政策。隨著LED照明技術的不斷進步,市場范疇的不斷擴大,LED驅動IC行業(yè)也得到了高速發(fā)展。本文在研究LED驅動電路原理及發(fā)展方向的基礎上,結合市場需求與工藝參數(shù)極限,本文設計了一款連續(xù)電感電流降壓型LED恒流驅動芯片。該芯片采用高端電流采樣設置LED平均電流,并可以通過DIM端口進行模擬調光和較寬范圍的PWM調光;內部REGULATOR模塊對輸入電壓進行穩(wěn)壓,產生內部供電電源,這樣可以在不增加芯片面積成本的條件下,大幅度增大了輸入電壓范圍;同時芯片內部集成有過溫保護、欠壓鎖定等模塊,確保系統(tǒng)能夠安全穩(wěn)定的工作。電路利用Cadence設計工具,將電路搭建在某公司0.35μm 40V BCD工藝平臺下進行仿真驗證及后端版圖設計。本文首先選擇對基準電壓源、調光功能、欠壓鎖定等子模塊進行分析與驗證,確保每個模塊在不同環(huán)境下都能穩(wěn)定工作;接著對系統(tǒng)功能及規(guī)格參數(shù)進行仿真驗證;最后完成版圖設計。仿真驗證結果表明:輸入電壓范圍為8~30V,當輸入電壓低于4.5V時,功率管關斷;調光電壓范圍為0.35~2.5V,當調光電壓小于0.3V時,功率管關閉;輸入電壓在8~30V范圍內變化時,輸出電流變化僅僅為11mA,輸出電流精度高達97%;在不同的調光環(huán)境下,調光誤差均控制在3%內。該芯片具有高精度的輸出電流、高的調光線性度、大的輸出電流、成本低等優(yōu)點。
[Abstract]:With the rapid development of the semiconductor industry, the third generation of electric light source LED semiconductor lighting technology came into being, LED compared with the traditional electric light source with high luminous efficiency, long life, environmental protection and other features, has attracted wide attention outside the industry, the government also gives policy support to LED industry. With the development of LED lighting technology, market category the expanding LED driver IC industry has also been rapid development. Based on the principle of LED driver circuit and the direction of development, combined with market demand and technological parameters of the limit, this paper introduces the design of a continuous inductor current step-down constant current LED driver chip. The chip uses a high current sampling set LED and average current. Through the DIM port analog dimming and a wide range of PWM dimming; internal REGULATOR module voltage to the input voltage, internal power supply, it can not The increase in chip area cost, greatly increases the input voltage range; at the same time chip integrated over temperature protection, undervoltage lockout module, ensure that the system can work safely and steadily. The circuit design using Cadence tools, the circuit simulation and layout design of a company in 0.35 m 40V BCD process under the platform. This paper first choice of reference voltage source, dimming function, undervoltage lockout module analysis and verification, to ensure that each module can work stably in different environments; then the system function and specification parameters for simulation; finally completed layout design. The simulation results show that the input voltage range of 8~30V and when the input voltage is lower than 4.5V, the power switch off; dimming voltage range of 0.35~2.5V, when the dimming voltage is less than 0.3V, the power tube is closed; the input voltage changes in the range of 30V 8~, The output current variation is only 11mA, and the output current accuracy is as high as 97%. Under different dimming conditions, the dimming error is controlled within 3%. The chip has the advantages of high output current, high dimming, large output current and low cost.

【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM923.34

【參考文獻】

相關碩士學位論文 前1條

1 虞志雄;脈寬調制型白光LED驅動芯片的設計[D];浙江大學;2006年

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本文編號：1745967