35 lines
1.3 KiB
Markdown
35 lines
1.3 KiB
Markdown
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# 🔌 N-Channel MOSFET: Overview
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An **N-channel MOSFET** (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of transistor that controls current flow using an electric field — it's a three-terminal device with:
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- **Gate (G)** — controls the transistor
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- **Drain (D)** — where current flows **into**
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- **Source (S)** — where current flows **out of**
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When a positive voltage is applied to the **gate** relative to the **source**, the MOSFET turns **on**, allowing current to flow from **drain to source** (D → S).
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## ⚙️ Common Uses
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- Power switching in motor drivers
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- Voltage regulation
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- Signal modulation
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- Digital logic switching
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---
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# 🔁 Use in an H-Bridge Motor Controller
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An **H-bridge** is a circuit used to control the **direction** of a DC motor. It consists of **four switches**, typically implemented with N-channel MOSFETs:
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## H-Bridge Configuration:
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- **Q1 + Q4 ON** → motor spins in one direction
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- **Q2 + Q3 ON** → motor spins in the opposite direction
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- **PWM control** on low-side N-MOSFETs allows speed control
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Because N-channel MOSFETs conduct easily when their **gate voltage is higher than the source**, they're ideal for **low-side switching**. High-side use may require **gate driver circuits** to boost voltage.
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