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
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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:
- 負載為小型馬達
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