1. General description
The TFA9812 is a high-efficiency Bridge Tied Load (BTL) stereo Class-D audio amplifier
with a digital I2S audio input. It is available in a HVQFN48 package with exposed die
paddle. The exposed die paddle technology enhances the thermal and electrical
performances of the device.
The TFA9812 features digital sound processing and audio power amplification. It supports
I2C control mode and Legacy mode. In Legacy mode I2C involvement is not needed
because the key features are controlled by hardware pin connections.
A continuous time output power of 2 ×12W(R
L=8Ω,V
DDP = 15 V) is supported without
an external heat sink. Due to the implementation of a programmable thermal foldback
even for high supply voltages, higher ambient temperatures, and/or lower load
impedances, the device operates without sound interrupting behavior.
TFA9812 is designed in such a way that it starts up easily (no special power-up sequence
required). It features various soft and hard impact protection mechanisms to ensure an
application that is both user friendly and robust.
A modulation technique is applied for the TFA9812, which supports common mode choke
approach (1 common mode choke only per BTL amplifier stage). This minimizes the
number of external components.
2. Features
2.1 General features
n3.3 V and 8 V to 20 V external power supply
nHigh efficiency and low power dissipation
nSpeaker outputs fully short circuit proof across load, to supply lines and ground
nPop noise free at power-up/power-down and sample rate switching
nLow power Sleep mode
nOvervoltage and undervoltage protection on the 8 V to 20 V power supply
nUndervoltage protection on the 3.3 V power supply
nOvercurrent protection (no audible interruptions)
nOverdissipation protection
nThermally protected and programmable thermal foldback
nClock error protection
nI2C mode control or Legacy mode (i.e. no I2C) control
nFour different I2C addresses supported
nInternal Phase-Locked Loop (PLL) without using external components