elektronika (tke 4012)maulana.lecture.ub.ac.id/files/2016/09/03-teori-dioda.pdf · 2016. 9. 22. ·...
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Elektronika(TKE 4012)
Eka Maulana
maulana.lecture.ub.ac.id
Teori Dioda
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Content• Ide Dasar
• Pendekatan Dioda
• Datasheet Dioda
• Resistansi Bulk Dioda
• Resistansi DC Dioda
• Load Line Dioda
• Pengantar Rangkaian Dioda
Teori Semikonduktor
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# Konsep Dasar DiodaSimbol Skematik
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#1 Konsep Dasar Dioda
Knee voltage equals barrier potential
• Forward Region• Reverse Region
Vk = 0,7 voltVB Silicon : 0,7 volt
VB Germanium : 0,3 volt
Kurva Karakteristik Dioda
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#1 Teori Dioda
Resistansi Bulk (RB)
Arus Forward DC Maksimum (If atau IFmax)Lihat datasheet (ex: IFmax IN456 = 135 mA)
Power Dissipasion (PD) Power Rating (Pmax)
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Forward / Reverse?
# Contoh Kasus
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# Contoh Kasus
Sebuah dioda memiliki power rating 4 watt. Jika tegangan Dioda 1,1 volt dan arus yang mengalir 1.6 A berapa daya disipasi dioda? Dan apakah dioda akan rusak pada kondisi tersebut?
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# Pendekatan Dioda
Kurva Karakteristik
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# Pendekatan Diodaa. Dioda IDEAL (1st Approximation)
Kurva Dioda Rangkaian Equivalen
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Studi Kasus (1st Appr)
Tentukan Tegangan dan Arus pada beban (RL)
(a) (b)
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# Pendekatan Diodab. Pendekatan kedua
Rangkaian EquivalenKurva Dioda
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Studi Kasus (2nd Appr)
Tentukan Tegangan dan Arus pada beban (RL)
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Studi Kasus (2nd Appr)
Tentukan Tegangan dan Arus pada beban (RL)
Dengan teorema thevenin
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# Pendekatan Diodac. Pendekatan ketiga Rangkaian Equivalen
Kurva Dioda
RB < 1 ohm
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Studi Kasus (3rd Appr)Jika resistansi bulk dioda 0,23 Ω. Tentukan Tegangan, Arus dan Disipasi daya RL
Dengan teorema thevenin
Karena RB (0,23 Ω) << RL (1kΩ)RB dapat diabaikan (1/100 RL)Diselesaikan dengan pendekatan keduaVL = 9,3 VIL = 3,3 mA
Jika RL = 10 Ω maka dapat ditentukan:
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#3 Datasheet Dioda
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#4 Resistansi Bulk
Menghitung Resistansi Bulk Dioda
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#4 Resistansi DCForward Resistance (RF)Reverse Resistance (RR)
RDC = RB + Rbarrier_potential_effect
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# Load Line
Load Line Curve
QUIESCENT at rest
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#6 Rangkaian Pengantar
Rangkaian Penyearah Dioda
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Rangkuman: Pendeaktan Dioda