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資料整理:南臺科技大學電子系 楊峻泓陳延維

Lab 11:認識MOSFET與應用電路實習

【延伸閱讀】面對未來,你弄懂多少科技業知識?

MOSFET簡介


電路符號和慣用表示法

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圖片來源:D. A. Neamen-微電子學 (滄海圖書)

【延伸閱讀】D. A. Neamen-微電子學 (滄海圖書),中文第四版(上冊) pp.161-165


負載線與工作模式

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圖片來源:D. A. Neamen-微電子學 (滄海圖書)

  • 在汲極-源極迴路中,寫出克希荷夫電壓定律 (KVL)之等式,可稱為負載線等式,用來表示
    iDSVDS
    電壓之線性關係,對於顯現MOSFET偏壓區域很有幫助

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LTspice模擬項目


應用電路

IRF520 驅動模組

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  • 採用原裝IRF520功率場效電晶體,可以進行PWM調節輸出,可以讓Arduino驅動高達24V的負載,如LED燈條、直流馬達,透過調整脈波的工作週期,可以實現LED CV調光、馬達CV調速。
  • IRF520驅動模組規格:
    • 尺寸:33*24mm
    • 重量:10g
    • 電壓:3.3V、5V
    • 端口:數位電壓
    • 輸出負載電壓:0-24V
    • 輸出負載電流:<5A (1A以上需加散熱片)

電路圖

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請完成以下目標

  • 依據模組,先手畫電路圖
  • 依據手畫電路圖,在LTspice繪製電路圖
  • 模擬LTspice繪製的電路圖,進行模擬並思考結果是否正確
  • 模擬與量測的趨勢是否有一致性

用訊號產生器測試模組

  • 下圖為觀察IRF520驅動模組輸出的電路:
    • 訊號產生器:
      • 峰對峰值:1.5Vpp
      • 偏移量:0.75V
      • 週期:2 s
    • 電源供應器:
      • 電壓:1.5V
      • 限流:0.5A
    • 負載為小型馬達
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L298N 驅動模組