Datasheet > FT2128

FT2128

更新时间： 2025-05-18 01:12:27

品牌	Logo	应用领域
FANGTEK		/
页数	文件大小	规格书
23页	1063K
描述
3.4W Class-D Audio Power Amplifier with Dual Modes of Automatic Level Control

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FT2128 数据手册

ft2128

3.4W Class-D Audio Power Amplifier

with Dual Modes of Automatic Level Control

GENERAL DESCRIPTION

FEATURES

The ft2128 is a high-efficiency, high-performance,

Class-D audio power amplifier with dual modes of

automatic level control (ALC). It operates from 3V

to 5.5V supply. When powered with 5V supply

voltage, it is capable of delivering a continuous

average output of 3.4W into 3Ω load or 2.8W into

4Ω load with 4% THD+N.

 Wide supply voltage range from 3V to 5.5V

 Filterless Class-D operation

 Automatic level control to eliminate output

clipping

 Dual ALC modes of operation

 High efficiency up to 90%

 Constant output power at 5V supply (ALC-1)

3.2W (3Ω load, 1% THD+N)

2.6W (4Ω load, 1% THD+N)

1.4W (8Ω load, 1% THD+N)

 Constant output power at 5V supply (ALC-2)

3.4W (3Ω load, 4% THD+N)

The ft2128 features ALC to constantly monitor

and safeguard the audio output signals against

clipping. Once an over-level condition, caused by

either the over-level input signals or low battery

supply voltage, is detected, the ALC adjusts the

voltage gain of the amplifiers to minimize output

clipping while maintaining a maximally-allowed

dynamic range of the audio output signals. While

minimizing output clipping distortion, the ALC also

helps prevent excessive power dissipation and

protect speakers.

2.8W (4Ω load, 4% THD+N)

1.5W (8Ω load, 4% THD+N)

 ALC Range: 12dB

 Low quiescent current: 3mA @ VDD=3.6V

 Analog or digital scheme to set ALC operating

mode

As a Class-D audio power amplifier, the ft2128

features high efficiency up to 90%, which make

the device ideal for use in battery-powered

portable devices. Also, the ft2128 incorporates

shutdown mode to minimize power consumption

and comprehensive protection features against

various operating faults for a safe and reliable

operation.

 Short-circuit & thermal overload protection



Available in SOP-8L & MSOP-8L packages

APPLICATIONS



Portable navigation devices

Multimedia internet devices

Portable or Blue-tooth speakers

APPLICATION CIRCUIT

VDD

CS1

47uF

CS2

1uF

VDD

Rin

Cin470nF

VON

VOP

INN

INP

Input

Buffer

Class-D

Modulator

Output

Stage

OCP

OTP

CTRL

VREF

Mode

Control

Cctrl

0.1uF

Oscillator

VREF

Generator

optional

UVLO

Cvref

1uF

AGND/PGND

Figure 1: Typical Application Circuit Diagram

MAY, 2014

www.fangtek.com

12 3 4 5 6 7...23

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ft2128M	FANGTEK	获取价格	3.4W Class-D Audio Power Amplifier with Dual Modes of Automatic Level Control
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