TDA1552Q - 2 x 22W Class-B Audio Amplifier

Overview

The TDA1552Q is a high-performance integrated class-B output amplifier packaged in a 13-lead single-in-line (SIL) plastic power package. This device incorporates two 22W amplifiers configured in Bridge Tied Load (BTL) topology, making it particularly suitable for automotive and high-power audio applications where robust performance and reliability are essential.

Designed with system integration in mind, the TDA1552Q offers excellent audio performance while requiring minimal external components. Its comprehensive protection features and robust design make it ideal for demanding environments where power supply fluctuations and harsh operating conditions are common.

Key Features

• High Output Power: Delivers 2 x 22W in BTL configuration for powerful audio amplification
• Minimal External Components: Simplified design reduces board space and BOM cost
• Excellent Signal Integrity: Features low offset voltage at outputs and fixed gain for consistent performance
• Power Supply Robustness: Good ripple rejection ensures stable operation with noisy power supplies
• Advanced Control Options: Integrated mute/stand-by switch for power management
• Comprehensive Protection:
  • Load dump protection
  • AC and DC short-circuit protection to ground and VP
  • Thermal protection
  • Reverse polarity protection
  • High energy handling on outputs (VP = 0V)
  • Electrostatic discharge (ESD) protection
• Silent Operation: No switch-on/switch-off plop for improved user experience
• Thermal Efficiency: Low thermal resistance package design
• Mechanical Flexibility: Flexible leads for improved mechanical stress relief

Applications

The TDA1552Q is ideally suited for a wide range of audio amplification applications, including:

• Automotive Audio Systems:
  • Car radios
  • Amplifier modules
  • Infotainment systems
• Consumer Audio Equipment:
  • Home stereo systems
  • Powered speakers
  • Compact audio amplifiers
• Portable Audio Devices:
  • Boom boxes
  • PA systems
• Industrial Audio Applications:
  • Announcement systems
  • Industrial audio monitors

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VP): 18V (DC or peak)
• Output Peak Current: 4.5A
• Power Dissipation: See thermal characteristics
• Storage Temperature Range: -40°C to +150°C
• Junction Temperature: 150°C

Operating Characteristics (Ta = 25°C, VP = 14.4V, RL = 4Ω, unless otherwise specified)

• Supply Voltage Range: 6V to 18V
• Quiescent Current: 80mA typical (stand-by mode < 100µA)
• Output Power: 22W per channel (THD = 10%, RL = 4Ω, VP = 14.4V)
• Total Harmonic Distortion: 0.1% typical (PO = 4W, f = 1kHz)
• Frequency Response: 20Hz to 20kHz (-3dB points)
• Voltage Gain: 26dB fixed
• Input Resistance: 60kΩ typical
• Ripple Rejection: 60dB typical
• Output Offset Voltage: ±50mV maximum

Package Information

13-lead SIL Plastic Power Package

• Package Designation: SOT258-1
• Mounting Style: Through-hole
• Lead Material: Flexible leads for stress relief
• Thermal Resistance: 3K/W junction-to-case
• Dimensions: 20.5mm x 10.5mm x 4.5mm (typical)
• Weight: Approximately 4.5 grams

Pin Configuration

• Pin 1: Non-inverting input amplifier 1
• Pin 2: Inverting input amplifier 1
• Pin 3: Stand-by/mute control
• Pin 4: Supply voltage 1
• Pin 5: Output amplifier 1
• Pin 6: Ground 1
• Pin 7: Output amplifier 1
• Pin 8: Ground 2
• Pin 9: Output amplifier 2
• Pin 10: Ground 3
• Pin 11: Output amplifier 2
• Pin 12: Supply voltage 2
• Pin 13: Non-inverting input amplifier 2

Design Considerations

Thermal Management

For optimal performance and reliability, proper heat sinking is essential when operating the TDA1552Q at high power levels. The package features a low thermal resistance design, but additional cooling may be required depending on:

• Ambient operating temperature
• Output power requirements
• Enclosure ventilation

PCB Layout Guidelines

To maximize performance and minimize noise, follow these PCB layout recommendations:

• Use thick power and ground traces
• Place decoupling capacitors close to the IC
• Minimize output trace lengths
• Implement proper star grounding
• Provide adequate copper area for heat dissipation

Protection Circuit Implementation

While the TDA1552Q includes comprehensive built-in protection, additional external protection may be considered for:

• Extreme load dump conditions
• Additional ESD protection in harsh environments
• Overvoltage conditions beyond specified limits