19伏特轉3.3伏特同步降壓型控制器設計之分析與模擬

ANALYSIS AND SIMULATION OF A 19V-TO-3.3V SYNCHRONOUS STEP-DOWN CONTROLLER DESIGN

周子捷(Tzu-Chieh Chou)

指導教授 ： 蔡明傑

大同大學/電機資訊學院/電機工程學系所/碩士(2008年)

摘要

本論文主要為探討一高壓型同步直流降壓控制器之操作原理及設計要件，運用BJT 製程技術為其設計元件，並使用 SPICE 模擬軟體來進行各項系統模擬分析.
文章內容描述IC 內部線路如能隙參考電壓,放大器,脈衝寬度調變 ,頻率震盪器,驅動電路之工作原理,最後考慮到系統輸出端上所需之穩定及精確,增加L/C 濾波,補償及分壓元件,並依公式計算及設計出一穩定補償網路來實現穩定之輸出要求.
當外部輸入電壓為19伏特直流電壓時,可藉由本設計有效轉換成3.3伏特及2安培電流之穩定輸出。

關鍵字

同步降壓型控制器

並列摘要

This thesis presents design and analysis of a 19V-to-3.3V synchronous step-down controller with output system. The chip used BJT process; bottom-up flow and SPICE simulation tool to design and simulate whole circuits with application.
This thesis describes the operation of the step-down controller, the chip consists of bandgap reference, PWM, error amplifier and high/low MOSFET drive circuits. Considering to the system stability and accuracy, the output application has used LC filter, resistor divider with compensation network to stabilize the system.
When we connect 19V supplier to this synchronous step-down system, the system can exactly convert to very low ripple of 3.3V with 2A current output

並列關鍵字

synchronous step-down controller

參考文獻

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