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FT2128 PDF预览

FT2128

更新时间: 2024-01-11 11:54:11
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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

FT2128 数据手册

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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  
Rin  
Cin470nF  
Cin470nF  
VON  
VOP  
INN  
INP  
Input  
Buffer  
Class-D  
Modulator  
Output  
Stage  
OCP  
OTP  
R1  
CTRL  
VREF  
Mode  
Control  
Cctrl  
0.1uF  
R2  
Oscillator  
VREF  
Generator  
optional  
UVLO  
Cvref  
1uF  
AGND/PGND  
Figure 1: Typical Application Circuit Diagram  
MAY, 2014  
www.fangtek.com  
1

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