液晶顯示器白光二極體之脈波寬度調變升壓晶片設計

Design of the White LED Boost Chip with PWM for TFT LCD

呂侑祥(You-Hsiang Lu)

指導教授 ： 宋國明

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00013

摘要

本篇論文旨在設計描述一個白光發光二極體驅動晶片，即利用限流脈波寬度調變控制架構，來完成直流對直流升壓式轉換器。該電路架構包含有：誤差放大器、磁滯比較器、斜波產生電路、非重疊電路及電壓-電流轉換電路，並內建帶差參考電路，可同時提供參考電壓及參考電流，其中，該直流對直流升壓式轉換器晶片內建斜率補償，以防止次諧波震盪(Sub-harmonic oscillation)。
本論文共設計三顆晶片，均採用TSMC 0.35μm 2P4M互補金氧半混合信號製程完成，其中該直流對直流升壓式轉換器晶片面積為0.8918×0.917 mm2，當輸入電壓為3.3 V時，其輸出電壓為18 V及輸出電流為20 mA時，且其輸出漣波為5.98 mV，可以驅動5顆白光發光二極體，系統轉換效率達85%。

關鍵字

直流-直流轉換器 ； 脈波寬度調變 ； 帶差參考電路 ； 白光發光二極體

並列摘要

This thesis is focused on design of the white LED driving chip. By using the control structure of current-limited pulse width modulation, we can implement the boost DC-to-DC switching converter. The circuit architecture includes error amplifier, hysteresis comparator, linear ramp and oscillator generator, non-overlap circuit, and voltage to current converter. Note that the built-in bandgap reference can simultaneously support a reference voltage and a reference current. Furthermore, the boost DC-to-DC switching converter consists of the slope-compensation technique to from avoid the sub-harmonic oscillation.
In this thesis, we proposed three chips which are designed and implemented with the TSMC 0.35

並列關鍵字

DC-DC Converter ； Pulse Width Modulation ； Bandgap References ； White LED

參考文獻

[1] 游東明，具有數位亮度調整之白光發光二極體驅動器晶片設計，碩士論文，國立臺北科技大學電機工程研究所，台北，2006。

[2] 蘇育正，切換式直流對直流升壓控制器之設計，碩士論文，國立臺北科技大學電機工程研究所，台北，2006。

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