Introduction
The demand for high-power amplifiers is increasing rapidly due to the ever-growing need for efficient audio amplification systems. MOSFET power amplifiers have gained significant popularity in recent years because of their outstanding performance and reliability. In this article, we will discuss a powerful 400W MOSFET power amplifier circuit diagram that utilizes IRFP9240 and IRFP240 in the output stage, BD139 and BD140 in the driver section, and TL071 IC in the preamplifier section. This circuit can deliver top-notch audio quality and is suitable for various audio applications, including home theater systems, sound reinforcement setups, and music studios
Specifications (in vertical order):
IRFP9240:
- Maximum Drain-Source Voltage: 200V
- Continuous Drain Current: 12A
- Power Dissipation: 150W
- On-State Resistance: 0.55Ω
- Gate Threshold Voltage: 2-4V
IRFP240:
- Maximum Drain-Source Voltage: 200V
- Continuous Drain Current: 20A
- Power Dissipation: 150W
- On-State Resistance: 0.14Ω
- Gate Threshold Voltage: 2-4V
BD139:
- Collector-Emitter Voltage: 80V
- Collector Current: 1.5A
- Power Dissipation: 8W
- DC Current Gain: 40-250
- Transition Frequency: 100MHz
BD140:
- Collector-Emitter Voltage: 80V
- Collector Current: 1.5A
- Power Dissipation: 8W
- DC Current Gain: 40-250
- Transition Frequency: 100MHz
TL071:
- Supply Voltage: ±18V
- Input Voltage Range: ±15V
- Slew Rate: 13V/μs
- Open Loop Gain: 100dB
- Total Harmonic Distortion: 0.003%
MOSFET Amplifier Circuit Diagram using IRFP9240 & IRFP240
This project can be built using a few basic components. The circuit diagram of this project is shown below.
400W MOSFET Power Amplifier Circuit Diagram using IRFP9240 & IRFP240
50V Power Supply Circuit Diagram
Caution: Website contains information on high voltage circuits. Proceed at your own risk, ensuring proper knowledge and precautionary measures to prevent electric shock or injury.
Components List of MOSFET Amplifier Circuit using IRFP9240 & IRFP240
Following is the list of all components used in this project:
- IRFP9240 MOSFET x 4
- IRFP240 MOSFET x 4
- BD139 Transistor x 1
- BD140 Transistor x 1
- TL074 IC x 1
Explanation of MOSFET Amplifier Circuit using IRFP9240 & IRFP240
The 400W MOSFET power amplifier circuit diagram consists of three main sections – the preamplifier, driver stage, and output stage. The preamplifier section incorporates the TL071 IC, which serves as an excellent low-noise and high-gain choice for the audio signal amplification. This section ensures proper amplification of weak audio signals from various input sources.
Moving on to the driver stage, it employs the BD139 and BD140 transistors. These transistors are well-known for their high current and voltage capability, making them ideal for driving the power MOSFETs in the output section. The driver stage amplifies the preamplifier’s output signal, providing enough power to drive the power MOSFETs efficiently.
The output section is where the IRFP9240 and IRFP240 MOSFETs shine. These power MOSFETs offer high power handling capability, excellent thermal characteristics, and low on-state resistance. By utilizing these MOSFETs in a complementary push-pull configuration, the amplifier circuit achieves excellent linearity, low distortion, and high output power. Additionally, the MOSFETs’ built-in protection features safeguard the amplifier against overcurrent and thermal overload conditions.
Conclusion
The 400W MOSFET power amplifier circuit diagram discussed in this article showcases the exceptional performance achieved by utilizing high-quality components such as the IRFP9240, IRFP240, BD139, BD140, and TL071. This amplifier design offers a powerful output, excellent linearity, and low distortion, making it an ideal choice for high-fidelity audio applications. Its flexible design allows it to be used in various settings, from home theater systems to professional audio setups. By incorporating this circuit into your audio system, you can enjoy a remarkable audio experience with exceptional clarity and power.
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