The TPA3112D1 is a 25-W efficient, Class-D audio power amplifier for driving a bridge
tied speaker. Advanced EMI Suppression Technology enables the use of inexpensive ferrite bead
filters at the outputs while meeting EMC requirements. SpeakerGuard speaker protection system
includes an adjustable power limiter and a DC detection circuit. The adjustable power limiter
allows the user to set a voltage rail lower than the
chip supply to limit the amount of current through the speaker. The DC detect circuit measures the
frequency and amplitude of the PWM signal and shuts off the output stage if the input capacitors
are damaged or shorts exist on the inputs.
The TPA3112D1 can drive a mono speaker as low as 4Ω. The high efficiency of the
TPA3112D1, > 90%, eliminates the need for an external heat sink when playing music.
The outputs are fully protected against shorts to GND, VCC, and
output-to-output. The short-circuit protection and thermal protection includes an auto-recovery
feature.
