TDA7560 datasheet | amplifier | pdf | vs TDA7850

Key Features of the TDA7850 Audio Amplifier

The TDA7850 is a high-performance audio amplifier IC from STMicroelectronics, designed for use in car audio systems and home entertainment setups. It provides up to 50W of output power per channel, offering excellent sound quality with low distortion. This class AB amplifier is known for its efficiency and reliability, handling high temperatures without compromising performance. The TDA7850 integrates short-circuit and over-temperature protection, making it highly durable and safe for continuous operation. Its versatility allows it to drive both bridge and parallel configurations, making it a perfect choice for driving subwoofers or speakers in automotive and audio applications. Whether you’re building a custom audio system or replacing an existing component, the TDA7850 delivers powerful and clear sound.

TDA7850 Pinout

Using the TDA7850 Pinout

The TDA7850 audio amplifier has several important pins for proper operation. The VCC (Pin 1) and VSS (Pin 7) provide the necessary power for the chip, with VCC connected to a +12V power supply and VSS to ground. The IN1 and IN2 pins (Pins 2 and 3) receive the audio signals from your source device. The OUT1 and OUT2 pins (Pins 5 and 6) provide the amplified signal to your speakers or audio load. The MUTE pin (Pin 8) allows you to mute the audio output, and the STBY pin (Pin 9) enables or disables the amplifier’s operation. Make sure to connect the GND pin (Pin 4) to the system ground and use proper filtering and decoupling for stable performance.

TDA7850 Equivalent Models

Here’s a comparison of equivalent audio amplifier ICs with similar packaging and features:

Substitution Tips

When replacing the TDA7850, consider the output power, supply voltage, and total harmonic distortion (THD+N) to ensure compatibility with your system. If you’re looking for a more efficient solution, the TDA7492 is a great alternative, offering similar output power with a class D design that provides better efficiency and smaller heat dissipation. For smaller audio applications with lower power requirements, the TDA2005 could be a good fit. The LM388 is ideal if you need a single-channel audio amplifier for a subwoofer or more specialized applications. Always check the package type and channel configuration to make sure the replacement fits your design.

TDA7850 Bridge Configuration

The TDA7850 is commonly used in bridge configurations to drive speakers in car audio systems, home theater setups, and other audio amplification applications. In a bridge configuration, two TDA7850 amplifiers are used to drive a speaker with higher output power and efficiency. This setup effectively doubles the power output, delivering a more robust sound performance with less heat dissipation compared to traditional designs. By using the TDA7850 in bridge mode, you can achieve high-quality audio amplification while maintaining low distortion and thermal protection.

TDA7850 Amplifier Board

The TDA7850 amplifier board is a convenient and ready-to-use solution for building audio amplifiers. This board integrates the TDA7850 IC along with necessary components like capacitors, resistors, and heat sinks, allowing for easy integration into your audio projects. Ideal for use in automotive audio systems or DIY audio amplifiers, the board provides a stable, high-quality amplification with low distortion. It’s perfect for those who want to avoid designing their own circuit from scratch and need a reliable, cost-effective solution for driving speakers in their audio applications.

Here’s a practical circuit diagram for the TDA7850 4-channel audio power amplifier, commonly used in automotive audio applications.

TDA7850 4-Channel Audio Amplifier Circuit

Circuit Analysis

This circuit utilizes the TDA7850 MOSFET-based class AB amplifier IC to deliver 4 x 50W output power, making it suitable for driving speakers in car audio systems.

• Power Supply: The amplifier operates with a 14.4V DC supply, typical for automotive applications.

• Input Signals: Four audio input channels (IN1 to IN4) are provided, each coupled with a 0.1µF capacitor to filter high-frequency noise.

• Mute and Standby Functions: The MUTE and ST-BY pins control the amplifier’s operation, allowing for audio muting and standby modes.

• Output Channels: The amplifier provides four output channels (OUT1+ to OUT4+) and their respective negative terminals (OUT1- to OUT4-), connected to the speakers.

• Decoupling Capacitors: Capacitors (C1 to C10) are used for power supply decoupling and signal filtering to ensure stable operation and minimize noise.

• Thermal and Short-Circuit Protection: The TDA7850 includes built-in protections against thermal overload and short circuits, enhancing the reliability of the amplifier.

Application Notes

• Component Placement: Ensure that capacitors are placed close to the corresponding pins to minimize parasitic inductance and resistance.

• Heat Dissipation: Proper heat sinking is essential for the TDA7850 to prevent thermal shutdown during prolonged operation.

• Speaker Impedance: The amplifier is designed to drive 4Ω speakers; using speakers with different impedances may affect performance and potentially damage the amplifier.

• Power Supply: Use a regulated 14.4V DC power supply capable of delivering sufficient current to meet the amplifier’s requirements.

For a detailed view of the circuit diagram and additional information, you can refer to the original source.