TFA9812 Datasheet, PDF(1/66 Page) NXP Semiconductors – BTL stereo Class-D audio amplifier with I2S input

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TFA9812 Datasheet, PDF (1/66 Pages) NXP Semiconductors – BTL stereo Class-D audio amplifier with I2S input

TFA9812

BTL stereo Class-D audio ampliï¬er with I2S input

Rev. 01 â 30 October 2008

Preliminary data sheet

1. General description

The TFA9812 is a high-efï¬ciency Bridge Tied Load (BTL) stereo Class-D audio ampliï¬er

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 ampliï¬cation. 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 Ã 12 W (RL = 8 â¦, VDDP = 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 ampliï¬er stage). This minimizes the

number of external components.

2. Features

2.1 General features

I 3.3 V and 8 V to 20 V external power supply

I High efï¬ciency and low power dissipation

I Speaker outputs fully short circuit proof across load, to supply lines and ground

I Pop noise free at power-up/power-down and sample rate switching

I Low power sleep mode

I Overvoltage and undervoltage protection on the 8 V to 20 V power supply

I Undervoltage protection on the 3.3 V power supply

I Overcurrent protection (no audible interruptions)

I Overdissipation protection

I Thermally protected and programmable thermal foldback

I Clock error protection

I I2C mode control or Legacy mode (i.e. no I2C) control

I Four different I2C addresses supported

I Internal Phase-Locked Loop (PLL) without using external components

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