Efficient Class-D audio power amplifier for driving bridged-tied stereo speakers

Texas Instruments’ TPA3136D2 is an efficient, Class-D audio power amplifier for driving bridged-tied stereo speakers at up to 10W, 6ohm, or 8ohm (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 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 device can drive stereo speakers with as low as 4ohm impedance. The high efficiency of the device, 90% with an 8ohm load, eliminates the need for an external heat sink, and it will be able to output full power on a two-layer PCB.