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Texas Instruments TPA3138D2 Stereo Class-D Speaker Amplifier

Texas Instruments TPA3138D2 Stereo Class-D Speaker Amplifier is a 10W/ch, high-efficiency, low-idle-current Class-D stereo audio amplifier. The amplifier can drive stereo speakers with a load as low as 3.2Ω. The 1SPW mode consumes a low idle current of only 21mA (12V) and can operate down to 3.5V. This feature allows for longer audio play and improved thermal performance in BLUETOOTH® speakers, battery-powered appliances, and other power-sensitive applications. Advanced EMI Suppression with Spread Spectrum Control enables the use of inexpensive ferrite bead filters while meeting EMC requirements for system cost reduction.

To further simplify the design, the TPA3138D2 integrates essential protection features, including undervoltage, overvoltage, power limit, short circuit, overtemperature, and DC speaker protection. All of these protections come with automatic recovery. Customers can leverage every TPA3138D2 feature in existing designs as it is fully pin-to-pin compatible with TI’s TPA3110D2, TPA3136D2, and TPA3136AD2.

Features

  • Wide supply range 3.5V to 14.4V
    • 2×10W into 6Ω, 1% THD+N, 12V supply
    • 1x18.5W into 4Ω, 10% THD+N, 12V supply
    • THD+N : 0.04% at 1W, 1kHz input, 6Ω
  • Longer battery life for portable applications
    • 20mA (12V) Idle current in 1SPW mode
    • >90% Class-D efficiency
  • Reduced solution size and cost
    • Inductor-free operation
    • EN55013 and EN55022 EMC Compliant when no inductors are used
    • No external heatsink required
  • Flexible audio solution
    • Single-ended or differential analog inputs
    • Selectable gain of 20dB and 26dB
    • Pop and click-free startup
  • Integrated protections and auto recovery
    • Pin-to-pin, pin-to-ground, and pin-to-power short circuit protection
    • Thermal protection, undervoltage protection, and overvoltage protection
    • Power limiter and DC speaker protection
  • Pin-to-pin compatible with TPA3110D2, TPA3136D2, and TPA3136AD2

Applications

  • Televisions and monitors
  • Bluetooth speakers and wireless speakers
  • Audio amplifiers in smart appliance
  • Audio speakers in the Internet of Things
  • Consumer audio equipment

Simplified Schematic

Schematic - Texas Instruments TPA3138D2 Stereo Class-D Speaker Amplifier
Publicado: 2018-07-24 | Actualizado: 2023-02-01