NXP TDF8599C I2C总线控制立体声128W D类放大方案

NXP公司的TDF8599C是I2C总线控制的立体声双BTL汽车D类音频放大器，包括采用SOI BCDMOS技术的SOI BCDMOS输出级，能向8欧姆提供136W的功率，并具有全诊断功能。器件的工作电压从8V到48V，具有低静态电流和高效率，主要用在汽车音响和汽车娱乐系统。本文介绍了TDF8599C主要特性和优势，方框图，输出滤波器电路图以及几种典型应用案例电路图。

The TDF8599C is a dual Bridge-Tied Load (BTL) car audio amplifier comprising an NDMOST-NDMOST output stage based on SOI BCDMOS technology. Low power dissipation enables the TDF8599C high-efficiency, class-D amplifier to be used with a smaller heat sink than those normally used with standard class-AB amplifiers.

The TDF8599C can operate in either non-I2C-bus mode or I2C-bus mode. When in I2C-bus mode, DC load detection results and fault conditions can be easily read back from the device. Up to 15 I2C-bus addresses can be selected depending on the value of the external resistors connected to pins ADS and MOD.

When pin ADS is short circuited to ground, the TDF8599C operates in non-I2C-bus mode. Switching between Operating mode and Mute mode in non-I2C-bus mode is only possible using pins EN and SEL_MUTE.

TDF8599C主要特性和优势：

High-efficiency

Low quiescent current

Operating voltage from 8 V to 48 V

Two 8 ohm/6 ohm capable BTL channels or one 4 ohm /3 ohm capable BTL channel

Differential inputs

Fast-mode I2C-bus

I2C-bus mode with 15 I2C-bus addresses or non-I2C-bus mode operation

Clip detect

Independent short-circuit protection for each channel

Advanced short circuit protection for load, GND and supply

Load dump protection

Thermal foldback and thermal protection

DC offset protection

Selectable AD or BD modulation

Advanced clocking:

Switchable oscillator clock source: internal for Master mode or external for Slave mode

PLL mode to synchronize with external oscillator

Spread spectrum mode

Phase staggering

Frequency hopping

No ‘pop noise’ caused by DC output offset voltage

I2C-bus mode:

Load diagnostics

Speaker load, open load and shorted load

Amplifier output to ground and to supply shorts

Tweeter detection

Thermal pre-warning diagnostic level setting

Identification of activated protections or warnings

Selectable diagnostic information available using pins DIAG and CLIP

Selectable gain 32 dB/26 dB (32 dB in non-I2C-bus mode)

Qualified in accordance with AEC-Q100

TDF8599C应用：

Car audio

Audio entertainment systems

图1。TDF8599C方框图

图2。TDF8599C输出滤波器元件数值

图3。TDF8599C应用案例电路图：非I2C总线模式双BTL连接

图4。TDF8599C应用案例电路图：I2C总线模式双BTL连接

图5。TDF8599C应用案例电路图：I2C总线模式的双BTL主，单BTL从
详情请见：
http://www.nxp.com/documents/short_data_sheet/TDF8599C_SDS.pdf