Datasheet > 935303418062

935303418062

更新时间： 2024-09-17 21:09:39

品牌	Logo	应用领域
恩智浦 - NXP		商用集成电路
页数	文件大小	规格书
24页	221K
描述
Volume Control Circuit

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935303418062 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.83
商用集成电路类型：	VOLUME CONTROL CIRCUIT	Base Number Matches：	1

935303418062 数据手册

TFA9891

9.5 V boosted audio system with adaptive sound maximizer

and speaker protection

Rev. 1 — 21 December 2016

Product short data sheet

1. General description

The TFA9891 is a high efficiency class-D audio amplifier with a sophisticated speaker

boost and protection algorithm. It can deliver 7.2 W peak output power to an 8  speaker,

at a supply voltage of 3.6 V. The internal boost converter raises the supply voltage to

9.5 V, providing ample headroom for major improvements in sound quality.

A safe working environment is provided for the speaker under all operating conditions.

The TFA9891 maximizes acoustic output while ensuring that the diaphragm displacement

and voice coil temperature do not exceed their rated limits. This function is based on a

speaker box model that operates in all loudspeaker environments (e.g. free air, closed box

or vented box). Furthermore, advanced signal processing ensures that the quality of the

audio signal is never degraded by unwanted clipping or distortion in the amplifier or

speaker. An integrated Dynamic Range Compressor (DRC) allows the speaker to operate

at the highest possible power rating without suffering physical damage.

Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to

calculate both the temperature and the excursion. It allows the TFA9891 to adapt to

changes in the acoustic environment.

Internal intelligent DC-to-DC conversion boosts the supply rail to provide additional

headroom and power output. The supply voltage is only raised when necessary. It

maximizes the output power of the class-D audio amplifier while limiting quiescent power

consumption.

The TFA9891 also incorporates advanced battery protection. By limiting the supply

current when the battery voltage is low, it prevents the audio system from drawing

excessive load currents from the battery. Drawing excessive load currents from the

battery could cause a system undervoltage. The advanced processor minimizes the

impact of a falling battery voltage on the audio quality, by preventing distortion as the

battery discharges.

The device features low RF susceptibility because it has a digital input interface that is

insensitive to clock jitter. The second order closed loop architecture used in a class-D

audio amplifier provides excellent audio performance and high supply voltage ripple

rejection. The audio input interface is I²S and the control settings are communicated via

an I²C-bus interface.

The device also provides the speaker with robust protection against ESD damage. In a

typical application, no additional components are required to withstand a 15 kV discharge

on the speaker.

The TFA9891 is available in a 49-bump WLCSP (Wafer Level Chip-Size Package) with a

400 m pitch.

12 3 4 5 6 7...24

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