TPA3136D2, Class-D Audio Amplifier

By Texas Instruments 96

TPA3136D2, Class-D Audio Amplifier

Texas Instruments' TPA3136D2 device is an efficient, Class-D audio power amplifier for driving bridged-tied stereo speakers at up to 10 W, 6 Ω, or 8 Ω (per channel).

Advanced EMI suppression technology with spread-spectrum control scheme enables the use of inexpensive ferrite bead filters at the outputs while meeting EMC requirements for system-cost reduction. The TPA3136D2 device is not only fully protected against shorts and overload, the SpeakerGuard™ speaker protection circuitry includes a power limiter and a DC-detection circuit for protection of the connected speakers. The DC detect and pin-to-pin, pin-to-ground, and pin-to-power short-circuit protection circuit protect the speakers from output DC and pin shorts caused in production. The outputs are also fully protected against shorts to GND, PVCC, and output-to-output. The short-circuit protection and thermal protection includes an auto recovery feature.

The TPA3136D2 device can drive stereo speakers with as low as 4 Ω of impedance. The high efficiency of the TPA3136D2, 90% with an 8 Ω load, eliminates the need for an external heat sink, and the TPA3136D2 will be able to output full power on a 2-layer PCB.

Features
  • 2 x 10 W/ch into 6 Ω loads at 10% THD+N from a 12 V supply
  • 2 x 10 W/ch into 8 Ω loads at 10% THD+N from a 13 V supply
  • Up to 90% efficient Class-D operation (8 Ω) eliminates need for heat sinks
  • < 0.05% THD+N at 1 W/4 Ω/1 kHz
  • Wide supply voltage range allows operation from 4.5 V to 14.4 V
  • Inductor-free operation
  • Enhanced EMI performance with spread spectrum
  • SpeakerGuard speaker protection includes power limiter and DC protection
  • Robust pin-to-pin, pin-to-ground, and pin-to-power short-circuit protection and thermal protection
  • 26 dB fixed gain
  • Single-ended or differential analog inputs
  • Click- and pop-free startup

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