Table of Contents
Introduction
The TDA7382 is a high-performance 4 x 22W quad bridge amplifier, primarily used in car audio applications. It is designed to provide high-quality sound output while maintaining efficiency and low distortion. Manufactured by STMicroelectronics, the TDA7382 operates with a single power supply and features low standby current consumption. This amplifier is well-suited for automotive entertainment systems, offering high power output and excellent sound fidelity.
The TDA7382 is widely known for its thermal shutdown protection, short circuit protection, and low noise operation, making it a reliable choice for audio applications. It has a high voltage capability and works efficiently with 14.4V automotive battery systems. With an integrated mute and standby function, it provides users with convenient control over the audio output. The low harmonic distortion and high signal-to-noise ratio ensure clear and powerful sound reproduction.
Components Details
Below is a table listing the key components used in the TDA7382 amplifier circuit:
| Component | Value | Description |
|---|---|---|
| TDA7382 | – | Quad Bridge Amplifier IC |
| R1 | 10KΩ | Pull-up Resistor |
| R2 | 47KΩ | Mute Control Resistor |
| C1, C2, C3, C4 | 0.1µF | Input Coupling Capacitors |
| C5 | 0.47µF | Stability Capacitor |
| C6 | 47µF | Supply Voltage Regulator Capacitor |
| C7 | 2200µF | Power Supply Filtering Capacitor |
| C8 | 0.1µF | Decoupling Capacitor |
| C9, C10 | 1µF | Standby and Mute Capacitors |
Pinout Description
The TDA7382 has 25 pins, each serving a specific function. Below is a brief description:
| Pin | Name | Description |
|---|---|---|
| 1 | TAB | Ground connection |
| 2 | P-GND2 | Power Ground for Channel 2 |
| 3 | OUT2- | Negative Output Channel 2 |
| 4 | ST-BY | Standby Control |
| 5 | OUT2+ | Positive Output Channel 2 |
| 6 | VCC | Power Supply |
| 7 | OUT1- | Negative Output Channel 1 |
| 8 | P-GND1 | Power Ground for Channel 1 |
| 9 | OUT1+ | Positive Output Channel 1 |
| 10 | SVR | Supply Voltage Regulator |
| 11 | IN1 | Audio Input Channel 1 |
| 12 | IN2 | Audio Input Channel 2 |
| 13 | S-GND | Signal Ground |
| 14 | IN4 | Audio Input Channel 4 |
| 15 | IN3 | Audio Input Channel 3 |
| 16 | AC-GND | AC Ground |
| 17 | OUT3+ | Positive Output Channel 3 |
| 18 | P-GND3 | Power Ground for Channel 3 |
| 19 | OUT3- | Negative Output Channel 3 |
| 20 | VCC | Power Supply |
| 21 | OUT4+ | Positive Output Channel 4 |
| 22 | MUTE | Mute Control |
| 23 | OUT4- | Negative Output Channel 4 |
| 24 | P-GND4 | Power Ground for Channel 4 |
| 25 | HSD | High Side Driver |
Circuit Diagram
Working Principle
The TDA7382 operates as a quad bridge amplifier, meaning it has four independent output channels. Each channel is capable of delivering 22W of power when operating at 14.4V with 4Ω speakers. The amplifier utilizes a class AB design, which ensures a balance between efficiency and audio quality.
The working mechanism includes:
- Input Signal Processing: The audio input signals are processed through capacitors to block DC components.
- Amplification: The internal circuitry amplifies the signal using four independent bridge amplifiers.
- Output Stage: The amplified signal is delivered to the connected speakers, providing a powerful and clear sound output.
- Protection Features: The TDA7382 includes short-circuit, over-temperature, and overload protection, ensuring safe operation.
Circuit Explanation
The TDA7382 amplifier circuit consists of various passive components and the amplifier IC. Below is a step-by-step explanation:
- Power Supply: The circuit operates on a DC power supply (typically 12V-14.4V). Capacitors C7 (2200µF) and C8 (0.1µF) help in power filtering and stabilization.
- Input Section: Audio signals are fed into the amplifier through capacitors C1, C2, C3, and C4 to block DC interference.
- Control Pins: The Standby (ST-BY) and Mute (MUTE) pins control the amplifier’s ON/OFF state and mute functionality, respectively.
- Output Section: The amplified signals are driven to the speakers through the OUT1, OUT2, OUT3, and OUT4 pins.
- Grounding: Proper grounding is maintained using signal ground (S-GND) and power ground (P-GND) for efficient noise reduction and stable operation.
Applications
The TDA7382 audio amplifier is widely used in various audio systems due to its reliability and high performance. Some common applications include:
- Car Audio Systems – Used in vehicle entertainment systems to provide high-quality sound.
- Home Audio Amplifiers – Suitable for multi-channel home speaker systems.
- Portable Sound Systems – Can be used in battery-operated amplifiers.
- PA Systems – Ideal for small public address applications.
- Multimedia Speaker Systems – Enhances sound performance in computer and TV speaker setups.
Conclusion
The TDA7382 is a powerful and efficient 4 x 22W quad bridge amplifier, ideal for automotive and home audio applications. With its built-in protection features, high-quality output, and ease of integration, it remains a popular choice for designers looking to build robust audio amplification systems.
