TDA7386 Introduction
The TDA7386 is a high-performance AB-class audio power amplifier specifically designed for premium car radio systems. Encased in a Flexiwatt 25 package, it delivers exceptional audio quality and robust performance.
Utilizing a fully complementary PNP/NPN architecture, the TDA7386 achieves rail-to-rail output voltage swing without requiring bootstrap capacitors. This design minimizes the number of external components, enabling highly compact and efficient audio system designs.
TDA7386 Pin Connections
TAB: Heat dissipation connection, generally connected to ground or a heatsink.
P-GND2: Power ground for channel 2.
OUT2-: Negative output of channel 2.
ST-BY: Standby control pin.
OUT2+: Positive output of channel 2.
VCC: Positive supply voltage.
OUT1-: Negative output of channel 1.
P-GND1: Power ground for channel 1.
OUT1+: Positive output of channel 1.
SVR: Supply voltage ripple rejection capacitor connection.
IN1: Input signal for channel 1.
IN2: Input signal for channel 2.
S-GND: Signal ground for input signals.
IN4: Input signal for channel 4.
IN3: Input signal for channel 3.
AC-GND: Ground for AC-coupling capacitors.
OUT3+: Positive output of channel 3.
P-GND3: Power ground for channel 3.
OUT3-: Negative output of channel 3.
VCC: Positive supply voltage (secondary).
OUT4+: Positive output of channel 4.
MUTE: Mute control pin.
OUT4-: Negative output of channel 4.
P-GND4: Power ground for channel 4.
N.C.: Not connected.
TDA7386 Block Diagram
TDA7386 Test and Application Circuit
TDA7386 Specification
| Parameter | Value |
| Output Type | 4-Channel (Quad) |
| Supply Voltage (VCC) | 8V ~ 18V |
| Output Power | 45W x 4 @ 4Ohm |
| Load Impedance | 4Ω or 2Ω |
| Total Harmonic Distortion (THD) | ≤ 0.02% @ 1W, 4Ω, 14.4V |
| Supply Voltage Ripple Rejection (SVRR) | ≥ 50dB |
| Quiescent Current | 150mA |
| Standby Current | ≤ 100µA |
| Mute Function Activation Time | ≤ 100ms |
| Operating Temperature Range | -40°C ~ 105°C |
| Package Type | 25-Flexiwatt |
| Channel Separation | ≥ 50dB @ 1kHz |
| Input Impedance | 60kΩ |
TDA7386 Features
High output power capability:
4 x 49 W/4 Ω max.
4 x 28 W/4 Ω @ 14.4V, 1 kHz, 10%
4 x 24 W/4 Ω @ 13.2V, 1 kHz, 10%
Low distortion
Low output noise
Standby function
Mute function
Automute at min. supply voltage detection
Low external component count:
– Internally fixed gain (26dB)
– No external compensation
– No bootstrap capacitors
Protections:
– Output short circuit to GND, to VS, across the load
– Very inductive loads
– Overrating chip temperature with soft thermal limiter
– Load dump voltage
– Fortuitous open GND
– Reversed battery
– ESD
TDA7386 Applications
Car Audio Systems
Multimedia Systems
Public Address (PA) Systems
Home Audio Systems
Portable and Outdoor Audio Equipment
Marine Audio Systems
Industrial Intercom Systems
Alarm and Notification Systems
Custom DIY Audio Projects
Event and Concert Equipment
How to Use TDA7386?
First, correctly mount the TDA7386 in the Flexiwatt-25 package slot on the circuit board. Connect the power supply (VCC) to pin 6 and pin 20, while grounding (GND) should be connected to the respective P-GND pins (such as pins 2, 8, 18, and 24) to ensure circuit stability. The input signals should be routed to the audio source through the IN1 to IN4 pins (pin 11, 12, 14, and 15), and the SVR pin (pin 10) should be connected to a power decoupling network to optimize power ripple suppression.
When powering up the circuit, use the ST-BY pin (pin 4) and MUTE pin (pin 22) to connect to control signals, enabling or muting the chip as needed. After properly configuring the load, connect the audio output terminals (OUT1+/-, OUT2+/-, OUT3+/-, OUT4+/-) to the speakers, ensuring that the load impedance matches the requirements. Finally, verify all connections and load conditions, and implement appropriate heat dissipation management to ensure stable operation.
TDA7386 Package Information
The TDA7386 features a 25-Flexiwatt package, offering a compact design ideal for high-end car audio applications. This package includes 25 pins, ensuring efficient heat dissipation and excellent electrical connectivity while minimizing PCB space usage for easy installation and integration. Additionally, the Flexiwatt package enhances the chip's reliability and durability, making it highly suitable for audio amplification scenarios requiring high power output.
FAQs
What are the key features of the TDA7386?
The TDA7386 offers rail-to-rail output voltage swing, requires no bootstrap capacitors, and minimizes the need for external components, allowing compact and efficient circuit designs.
What type of application is the TDA7386 used for?
The TDA7386 is primarily used in car audio applications, including car radios, infotainment systems, and other automotive audio systems requiring high-quality sound output.
What precautions should be taken when using the TDA7386?
Ensure proper thermal management with adequate heat sinking to avoid overheating. Check all connections, verify load impedance compatibility, and avoid exceeding the maximum supply voltage and current limits.
