Yang Perlu Diketahui Tentang Dioda

Dioda tersedia dalam berbagai bentuk dan ukuran. Dioda arus tinggi sering dipasang pada perangkat heat-sink untuk mengurangi suhu operasinya. Dimungkinkan untuk menempatkan dioda secara paralel untuk meningkatkan kapasitas pembawa arus, tetapi karakteristik VI dari kedua dioda harus dicocokkan secara erat untuk memastikan bahwa arus terbagi secara merata (meskipun resistor kecil dapat ditempatkan secara seri dengan masing-masing dioda untuk membantu menyamakan Semua dioda memiliki beberapa arus bocor (arus yang melewati ketika dioda bias balik).

Arus bocor ini – lebih dikenal sebagai arus balik (IR) – sangat kecil, biasanya dalam kisaran nano ampere. Dioda juga memiliki tegangan balik maksimum yang diijinkan, tegangan balik puncak (PRV), atau tegangan balik puncak (PIV), di atasnya arus besar akan mengalir ke arah yang salah. Jika PIV dikecualikan, dioda dapat mengalami sengatan listrik dan dapat menjadi rusak secara permanen. PIV untuk dioda bervariasi dari beberapa volt hingga beberapa ribu volt. Salah satu metode untuk mencapai PIV yang lebih tinggi secara efektif adalah dengan menempatkan dioda dalam rangkaian. Sekali lagi, penting bahwa dioda dicocokkan untuk memastikan bahwa tegangan balik membagi secara merata (meskipun resistor kecil yang ditempatkan paralel dengan masing-masing dioda dapat digunakan untuk menyamakan tegangan balik).

Hal-hal lain yang perlu dipertimbangkan tentang dioda termasuk arus maju maksimum (IF), kapasitansi (dibentuk di persimpangan pn), dan waktu pemulihan pemulihan. Sebagian besar dioda memiliki desain 1-awalan (misalnya, 1N4003). Dua ujung dioda biasanya dibedakan satu sama lain dengan tanda. Untuk dioda enkapsulasi kaca, katoda ditetapkan dengan pita hitam, sedangkan dioda enkapsulasi hitam-plastik menggunakan pita putih. Jika tidak ada simbol (seperti yang terlihat dengan banyak dioda daya), katoda mungkin berupa baut seperti baut. Bagian ini dimasukkan melalui perangkat heat-sink (sepotong logam dengan lubang) dan diikat dengan mur. Mesin pencuci serat atau mika digunakan untuk mengisolasi katoda secara elektrik dari pendingin logam, dan pelumas silikon khusus ditempatkan di antara mesin cuci dan pendingin untuk meningkatkan konduktivitas termal.

Dioda zener adalah perangkat yang bertindak sebagai dioda pn-junction yang tipikal ketika datang untuk memajukan bias, tetapi juga memiliki kemampuan untuk melakukan dalam arah bias balik ketika tegangan breakout spesifik (VB) tercapai. Dioda zener biasanya memiliki voltase breakdown dalam kisaran beberapa volt hingga beberapa ratus volt (walaupun voltase breakdown efektif yang lebih besar dapat dicapai dengan menempatkan dioda zener secara seri).

54 thoughts on “Yang Perlu Diketahui Tentang Dioda

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