The TPA3112D1-Q1 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™ protection circuitry system includes an adjustable power
limiter and a DC detection circuit. The adjustable power limiter allows the user to set a virtual
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-Q1 can drive a mono speaker as low as 4 Ω. The high efficiency of the
device, > 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
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