NXP TDF8599A 2x135W D类汽车音频放大方案

NXP 公司的TDF8599A是具有负载诊断功能的2x135W或1x250W D类音频放大器,包括了采用SOI BCDMOS技术的NDMOST-NDMOST输出级. TDF8599A具有低功耗高效率,和标准的AB类放大器相比,可以采用更小型的散热器. TDF8599A可以工作在非I2C总线模式或I2C总线模式.工作电压从8V到35V,主要用在汽车音响.本文介绍了TDF8599A的主要特性,方框图以及多种应用案例,包括非I2C总线模式的双BTL模式, I2C总线模式的双BTL模式, I2C总线模式的单BTL模式和2C总线模式的双BTL主,单BTL从模式.

TDF8599A:I2C-bus controlled dual channel 135 W/4 ohm , single channel 250 W/2 ohm class-D power amplifier with load diagnostics

The TDF8599A 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 TDF8599A high-efficiency, class-D amplifier to be used with a smaller heat sink than those normally used with standard class-AB amplifiers.

The TDF8599A 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 resistor connected to pins ADS and MOD.

When pin ADS is short circuited to ground, the TDF8599A 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.

TDF8599A主要特性:

High-efficiency

Low quiescent current

Operating voltage from 8 V to 35 V

Two 4ohm/2ohm capable BTL channels or one 1ohm capable BTL channel

Differential inputs

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

Parallel channel mode for high current drive capability

Advanced clocking:

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

Spread spectrum mode

Phase staggering

Frequency hopping

No‘pop noise’ caused by DC output offset voltage

I2C-bus mode:

DC load detection

AC load detection

Thermal pre-warning diagnostic level setting

Identification of activated protections or warnings

Selectable diagnostic information available using pins DIAG and CLIP

Qualified in accordance with AEC-Q100

TDF8599A应用:

Car audio


图1.TDF8599A方框图



图2.TDF8599A应用案例:非I2C总线模式的双BTL模式



图3.TDF8599A应用案例:I2C总线模式的双BTL模式



图4.TDF8599A应用案例:I2C总线模式的单BTL模式



图5.TDF8599A应用案例:I2C总线模式的双BTL主,单BTL从模式