TDA2003 Technical Summary

TDA2003 - 10W Car Radio Audio Amplifier

Overview

The TDA2003 is a monolithic integrated circuit in Pentawatt package, intended for use as a low frequency class AB amplifier. It provides a high output current capability (up to 3.5A) and can drive very low impedance loads down to 1.6 ohms. The device is specifically designed for car radio applications and other automotive sound systems, offering improved performance over its predecessor, the TDA2002.

With its wide operating voltage range and excellent ripple rejection, the TDA2003 maintains high audio quality even in demanding automotive electrical environments. The built-in protection against output short-circuits and thermal overload makes it particularly robust for vehicle applications where reliability is crucial.

Key Features

High output power: 10W (typical) at 14.4V, 4Ω, 1kHz, 10% THD
Wide operating voltage range: 8V to 18V
Low distortion and low noise
Excellent ripple rejection: 35dB (typical)
High current capability: up to 3.5A
Built-in short circuit protection
Thermal overload protection
Load dump protection
Flexible mute/st-by function
Minimum external components required
Improved performance over TDA2002

Applications

The TDA2003 is specifically designed for automotive audio applications but can be used in various other audio amplification scenarios:

Car radio power amplifiers
Automotive sound systems
Portable audio devices
Television sound systems
Home stereo systems
PA (Public Address) systems
Multimedia speakers

Electrical Characteristics

(All characteristics measured at Vcc = 14.4V, Tamb = 25°C unless otherwise specified)

Absolute Maximum Ratings

Supply Voltage (Vcc): 18V
Peak Supply Voltage (50ms): 40V
Output Peak Current (non repetitive): 3.5A
Output Peak Current (repetitive): 2.5A
Power Dissipation (Tcase = 90°C): 20W
Operating Junction Temperature: -40°C to +150°C
Storage Temperature: -40°C to +150°C

Operating Characteristics

Supply Voltage Range: 8V to 18V
Quiescent Current: 50mA (typical)
Output Power:
- 10W at 14.4V, 4Ω, 1kHz, 10% THD
- 6W at 14.4V, 2Ω, 1kHz, 10% THD
- 8W at 12V, 4Ω, 1kHz, 10% THD
Total Harmonic Distortion (Po = 4W, f = 1kHz): 0.2% (typical)
Frequency Response (-3dB): 40Hz to 15kHz
Input Sensitivity (Po = 4W): 60mV (typical)
Input Impedance: 150kΩ (typical)
Ripple Rejection: 35dB (typical)

Package Information

Pentawatt Package (Vertical)

Package Type: Pentawatt (5-lead)
Mounting Type: Through Hole
Pin Count: 5
Dimensions: 10.2mm x 8.6mm x 4.7mm
Weight: Approximately 2.5 grams
Termination: Solder
Operating Temperature: -40°C to +125°C

Pin Configuration

Pin 1: Input
Pin 2: Ground
Pin 3: Bootstrap
Pin 4: Output
Pin 5: Supply Voltage (Vcc)

Thermal Considerations

The TDA2003 requires proper heat sinking for optimal performance and reliability. The maximum junction temperature should not exceed 150°C. The thermal resistance junction to case (Rth j-c) is 3°C/W, and the thermal resistance junction to ambient (Rth j-a) is 50°C/W when mounted on a proper heat sink.

For continuous operation at maximum power, a heat sink with thermal resistance of less than 5°C/W is recommended. The mounting surface should be flat, clean, and free from oxidation to ensure good thermal contact.

Application Circuit Example

A typical application circuit for the TDA2003 includes:

Input coupling capacitor (1µF to 10µF)
Bootstrap capacitor (100µF)
Output capacitor (1000µF)
Feedback network resistors
Zobel network for stability (0.1µF + 1Ω)

The circuit typically provides a voltage gain of about 40dB (100x) when using standard recommended component values. The input impedance is primarily determined by the feedback network resistors.

Design Considerations

Power Supply Requirements

The TDA2003 operates from a single power supply ranging from 8V to 18V. For automotive applications, the circuit should be designed to handle the typical 12V automotive electrical system with its variations (load dump, cold crank, etc.). A bulk storage capacitor (1000µF to 4700µF) near the IC is recommended to handle transient conditions.

PCB Layout Guidelines

Keep all connections to the amplifier as short as possible
Use a ground plane for improved noise immunity
Place decoupling capacitors close to the IC
Use thick traces for power and output connections
Ensure proper heat sinking by providing adequate copper area
Separate signal ground from power ground where possible

Reliability and Protection Features

The TDA2003 incorporates several protection mechanisms to ensure reliable operation in automotive environments:

Short Circuit Protection: The output is protected against short circuits to ground, Vcc, or across the load
Thermal Shutdown: The device automatically shuts down when the junction temperature exceeds 150°C
Load Dump Protection: Can withstand transient voltages up to 40V for 50ms
Reverse Polarity Protection: Can tolerate brief reverse polarity conditions