The model "TDA7851L" is part of the STMicroelectronics brand, which is well-known for designing and producing integrated circuits. The TDA7851L is specifically designed as a 5-channel audio Power amplifier. It is typically used in automotive and high-quality audio systems.
Package Information
The TDA7851L is typically packaged in a Multiwatt15 (also referred to as PowerSO-15) form, which is a 15-pin package.
Pin Function Specification and Circuit Principle
Here’s a detailed pinout and explanation for the TDA7851L in Multiwatt15 packaging:
Pin Function Table Pin Number Pin Name Pin Function Description 1 VCC Positive supply voltage for the amplifier. 2 VSS Ground pin. 3 IN1+ Non-inverting input for the first channel (left channel, front). 4 IN1- Inverting input for the first channel (left channel, front). 5 OUT1 Output of the first audio channel. 6 VCC2 Positive supply voltage for the second amplifier stage. 7 IN2+ Non-inverting input for the second channel (right channel, front). 8 IN2- Inverting input for the second channel (right channel, front). 9 OUT2 Output of the second audio channel. 10 VSS2 Ground for the second amplifier stage. 11 IN3+ Non-inverting input for the third channel (left rear). 12 IN3- Inverting input for the third channel (left rear). 13 OUT3 Output of the third audio channel. 14 VCC3 Positive supply voltage for the third amplifier stage. 15 VSS3 Ground for the third amplifier stage.The TDA7851L is designed to drive multiple audio channels, typically found in multi-channel car audio systems. The inputs and outputs are responsible for the front and rear channels, while the voltage supply pins manage the power distribution to each section of the amplifier.
Circuit Principles and Usage
Power Supply: The TDA7851L requires multiple positive supply voltages (VCC1, VCC2, VCC3) to operate its individual amplification sections. Ground pins (VSS1, VSS2, VSS3) complete the circuit for each of these stages.
Input Configuration: Each audio channel is equipped with a differential input system: IN+ for the non-inverting input and IN- for the inverting input. This setup ensures the proper amplification of the audio signal in each channel.
Output Stage: Each audio output pin (OUT1, OUT2, OUT3) delivers the amplified audio signal to the connected speakers. These pins are capable of driving high-power audio outputs for automotive applications.
Detailed Pin Descriptions:VCC1, VCC2, VCC3 (Pins 1, 6, 14): These pins provide the positive supply voltage required for the amplifier stages. Each stage (front left, front right, rear left) has its own dedicated supply pin.
VSS1, VSS2, VSS3 (Pins 2, 10, 15): These are the ground pins for the corresponding amplifier sections. Proper grounding is essential for the stable operation of the circuit.
IN1+, IN1- (Pins 3, 4): These are the audio input pins for the front left channel. The positive pin (IN1+) receives the input signal, and the negative pin (IN1-) completes the differential input circuit.
OUT1 (Pin 5): The output pin for the front left audio channel. It connects to the speaker to drive the audio output.
IN2+, IN2- (Pins 7, 8): These are the input pins for the front right channel. Similar to the first input, IN2+ is non-inverting, and IN2- is inverting.
OUT2 (Pin 9): The output pin for the front right channel. It connects to the speaker for the right front channel audio output.
IN3+, IN3- (Pins 11, 12): These are the input pins for the left rear audio channel. IN3+ is non-inverting, while IN3- is inverting.
OUT3 (Pin 13): The output pin for the left rear audio channel. It drives the connected speaker with amplified audio.
20 Commonly Asked Questions (FAQs) About the TDA7851L
Q: What is the TDA7851L used for? A: The TDA7851L is a 5-channel audio power amplifier used in automotive and high-quality audio systems.
Q: What is the pin configuration of the TDA7851L? A: The TDA7851L has 15 pins, each with specific functions such as power supply, input, and output channels.
Q: How many amplifier stages does the TDA7851L have? A: The TDA7851L has 3 amplifier stages, each dedicated to a separate audio channel (front left, front right, rear left).
Q: Can the TDA7851L be used for subwoofer amplification? A: No, the TDA7851L is designed for full-range audio amplification and is typically used for driving speakers in the front and rear channels.
Q: What is the voltage range for the TDA7851L? A: The TDA7851L operates with a voltage range typically between 12V to 18V.
Q: How should the TDA7851L be grounded? A: The TDA7851L has three ground pins (VSS1, VSS2, VSS3) for proper grounding of each amplifier stage.
Q: What is the maximum output power of the TDA7851L? A: The TDA7851L can deliver up to 70W per channel in a car audio environment.
Q: Does the TDA7851L have short-circuit protection? A: Yes, the TDA7851L includes built-in protection features like short-circuit protection to prevent damage.
Q: What are the input signal types supported by the TDA7851L? A: The TDA7851L accepts differential input signals for each channel.
Q: How can I adjust the volume of each channel? A: Volume control can be achieved by adjusting the input signal levels.
Q: What are the recommended operating temperatures for the TDA7851L? A: The recommended operating temperature range is from -40°C to +150°C.
Q: Can the TDA7851L be used in a 2-channel configuration? A: Yes, by not using the rear channels, the TDA7851L can operate in a 2-channel configuration.
Q: What should I consider when connecting speakers to the TDA7851L? A: Ensure that the speakers are compatible with the output power and impedance levels of the amplifier.
Q: How is the TDA7851L's power dissipation managed? A: Heat sinks or proper ventilation should be used to dissipate the heat generated by the amplifier during operation.
Q: Can the TDA7851L be used for home audio systems? A: While it is primarily designed for automotive use, it can also be used in home audio systems with proper modifications.
Q: What kind of protection circuitry does the TDA7851L have? A: It includes overtemperature, overvoltage, and short-circuit protection features.
Q: How does the TDA7851L handle power-on sequencing? A: Proper power-on sequencing should be followed to avoid damage, ensuring the supply voltage is applied to all pins correctly.
Q: What are the key benefits of using the TDA7851L in automotive audio systems? A: The TDA7851L offers high power output, low distortion, and multiple protection features, making it ideal for automotive audio applications.
Q: Is the TDA7851L suitable for active crossover applications? A: Yes, the TDA7851L can be used in active crossover systems when paired with appropriate filters .
Q: Where can I find the datasheet for the TDA7851L? A: The official STMicroelectronics website provides the datasheet and all necessary documentation for the TDA7851L.
This explanation provides a detailed overview of the TDA7851L's pinout, functionality, and common usage queries. If you need further details or clarification, feel free to ask!
