TDA7377 Introduction
The TDA7377 is a high-performance audio amplifier IC for automotive and other high-power audio applications. It operates as a bridge amplifier, capable of driving speakers with a total output power of up to 14 watts per channel. The IC can convert low-level audio signals into high-power outputs, which provides greater output power and efficiency.
TDA7377 Pinout
Pin 1 (OUT1): Output for the first audio channel.
Pin 2 (OUT2): Output for the second audio channel.
Pin 3 (VCC): Power supply voltage.
Pin 4 (IN1): Input for the first audio channel.
Pin 5 (IN2): Input for the second audio channel.
Pin 6 (SVR): Supply voltage regulator.
Pin 7 (ST-BY): Standby pin.
Pin 8 (PW-GND): Power ground.
Pin 9 (S-GND): Signal ground.
Pin 10 (DIAG): Diagnostic pin.
Pin 11 (IN4): Input for the fourth audio channel.
Pin 12 (IN3): Input for the third audio channel.
Pin 13 (VCC): Power supply voltage.
Pin 14 (OUT4): Output for the fourth audio channel.
Pin 15 (OUT3): Output for the third audio channel.
TDA7377 CAD Models
TDA7377 Block Diagram
TDA7377 Standard Test and Application Circuit
TDA7377 Specification
| Specification | Value |
| Channels | 4 |
| Output Power | 4 x 11 W (per channel) at 14.4 V, 4 Ω |
| Output Type | 2-Channel (Stereo) or 4-Channel (Quad) |
| Total Harmonic Distortion (THD) | < 0.1% |
| Frequency Response | 20 Hz - 20 kHz (±3 dB) |
| Power Supply Voltage (VCC) | 8V - 18V |
| Power Dissipation | 40 W (max) |
| Standby Current | < 1 mA |
| Output Impedance | 4 Ω |
| Thermal Shutdown | Integrated |
| Short-Circuit Protection | Integrated |
| Package Type | Multiwatt15 |
TDA7377 Features
Delivers 35W + 35W, suitable for high-power audio applications.
Operates on DC 9-15V, with a power range of 50-100W, offering broad power compatibility.
2.0 stereo configuration for dual-channel audio output.
Covers a range of 20Hz to 20kHz, handling the full audio spectrum.
Supports 4-8 Ω speakers, 20-120W power range, and 3''-10'' bookshelf or floor speakers.
Provides 2 x 35W max at VCC=14.4V, f=1kHz, RL=4Ω for robust audio output.
Low ICC stand-by mode for energy efficiency and silent operation.
Internal gain of 26dB BTL and 20dB single-ended, no external compensation needed.
Pin 10 for detecting output clipping, short circuits, thermal shutdown, and soft short at turn-on.
Silent during stand-by operations, ensuring smooth audio transitions.
TDA7377 Protection Systems
Load Dump
Reversed Battery
Output DC and AC Short Circuit
Silent Turn On/Off
Thermal Shutdown
Load with Very Inductive Speakers
Fortuitous Open GND
ESD (Electrostatic Discharge)
TDA7377 Applications
Car Audio Systems
Home Stereo Amplifiers and Soundbars
Portable Speakers
TVs and Radios
DIY Audio Projects
TDA7377 Dimensions
How to Use TDA7377?
To use the TDA7377, begin by connecting the power supply to the VCC pins (pins 3 and 13) within the specified voltage range of DC 9-15V. Connect the input signals to the IN1 and IN2 pins for audio input. The audio output can be obtained from the OUT1 and OUT2 pins for the left channel and OUT3 and OUT4 for the right channel. In addition, attach the TDA7377 to a heatsink or cooling surface to manage heat dissipation.
FAQs
What are the output power capabilities of the TDA7377?
The TDA7377 can provide up to 35W per channel at 4Ω impedance with a supply voltage of 14.4V.
How is the TDA7377 controlled for standby operations?
The standby pin (ST-BY) controls the amplifier's power state. Setting this pin correctly ensures that the amplifier operates without audible pops during transitions.
Can the TDA7377 be used with different speaker impedances?
Yes, it is compatible with speakers having impedances between 4Ω and 8Ω.
