TDA7496LG:Class-D Audio Amplifier Design
Introduction
The TDA7496LG is a monolithic dual-channel Class-D audio amplifier delivering 30W per channel (THD = 10%) in PowerSSO-36 package. Engineered for automotive infotainment and industrial audio systems, it combines:
- 85% typical efficiency (vs. 55% in Class-AB alternatives)
- 380kHz switching frequency with spread-spectrum modulation
- Integrated protection circuits (thermal, short-circuit, under-voltage)
Its compact footprint (15.7mm × 7.5mm) and reduced heatsink requirements make it ideal for space-constrained 12V/24V applications.
Electrical Characteristics
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 6 | 14.4 | 18 | V |
| Output Power (THD = 10%) | - | 30 | - | W |
| Total Harmonic Distortion (Po = 1W) | - | 0.1 | - | % |
| Efficiency @ 20W × 2 | - | 85 | - | % |
| Quiescent Current | - | 40 | 60 | mA |
| Operating Temperature | -40 | - | 105 | °C |
Application Circuit Design
A typical 2 × 30W BTL configuration requires these critical components:
- Power Supply: 100µF low-ESR electrolytic (Panasonic EEU-FC1E101) within 10mm of VS pin
- Output Filter: 10µH shielded inductor (Würth 744773101) + 220nF X7R ceramic yields < -50dB residual switching noise
- Input Network: 1µF X7R coupling capacitor (Murata GRM188R71E105KA12) for DC blocking
- Enable Sequence: Apply VS before STBY (5ms delay recommended to avoid pop noise)
Performance Comparison
| Model | Class | Power (W) | Efficiency | Quiescent | Package Size |
|---|---|---|---|---|---|
| TDA7496LG | D | 30 × 2 | 85% | 40mA | 15.7 × 7.5mm |
| TDA7265 | AB | 25 × 2 | 55% | 80mA | 19 × 10mm |
| TAS5411-Q1 | D | 45 × 2 | 90% | 30mA | 12 × 6mm |
The TDA7496LG provides optimal balance between:
- vs TDA7265: 54% smaller solution volume with 30% higher efficiency
- vs TAS5411-Q1: Lower cost while maintaining automotive-grade temperature range
Recommended Bill of Materials
| Component | Value | Part Number | Key Parameter |
|---|---|---|---|
| Input Capacitor | 1µF/25V | GRM188R71E105KA12 | X7R, 0603, ±10% |
| Bulk Capacitor | 100µF/25V | EEU-FC1E101 | ESR = 0.12Ω @ 100kHz |
| Output Inductor | 10µH | 744773101 | 5A sat current, 35mΩ DCR |
| Filter Capacitor | 220nF/50V | GRM32ER71H224KA88 | X7R, 1210, ±10% |
Alternative Solutions
For design flexibility or second-source requirements:
- TDA7496LV: Narrower voltage range (6-16V) for battery-powered systems
- TDA7496ME: I²C diagnostics interface (reduced to 25W/channel)
- TDA7496L: Legacy version without spread-spectrum modulation
- Supply voltage compatibility
- Thermal performance requirements
- EMI certification needs
Conclusion
The TDA7496LG delivers optimal performance for 30W/channel automotive and industrial audio designs requiring:
- Class-D efficiency (85% typical) reducing thermal management complexity
- Compact PowerSSO-36 package enabling high-density PCB layouts
- Robust protection features for harsh electrical environments
Conclusion
The TDA7496LG delivers optimal performance for 30W/channel automotive and industrial audio designs requiring:
- Class-D efficiency (85% typical) reducing thermal management complexity
- Compact PowerSSO-36 package enabling high-density PCB layouts
- Robust protection features for harsh electrical environments
Frequently Asked Questions
The TDA7496LG requires at least 1oz (35μm) copper thickness for the thermal pad. For continuous high-power operation (2 × 20W), 2oz copper is recommended to maintain TJ < 125°C.
No, the TDA7496LG is not designed for parallel operation. For higher power requirements (up to 2 × 45W), consider the TAS5411-Q1 which supports parallel bridge-tied load (PBTL) configuration.
The datasheet recommends minimum 5ms delay from VS reaching 6V to STBY going high. This prevents audible pops during power-up. The following RC circuit achieves ~7ms delay:
Three key measures:
- Use shielded inductors (e.g., Würth 744773101 series)
- Implement π-filter on the supply line (10µH + 2×100µF capacitors)
- Keep output filter components within 10mm of IC pins
No, the standard TDA7496LG is not AEC-Q100 certified. For automotive applications requiring qualification, use the TDA7496LG-Q1 variant which passes:
- AEC-Q100 Grade 2 (-40°C to +105°C)
- ISO 7637-2 pulse immunity testing
For immediate samples or bulk orders, you can contact the supplier via the contact email below.
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