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ft2820P PDF预览

ft2820P

更新时间: 2024-01-01 05:09:51
品牌 Logo 应用领域
FANGTEK /
页数 文件大小 规格书
26页 890K
描述
4W Dual-PumpTM Class-G Audio Power Amplifier

ft2820P 数据手册

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ft2820  
4W Dual-PumpTM Class-G Audio Power Amplifier  
FEATURES  
GENERAL DESCRIPTION  
Proprietary Dual-PumpTM topology  
The ft2820 is a high efficiency 4W Class-G audio  
power amplifier for use in battery-based portable device  
applications. It integrates a filterless Class-D audio  
power amplifier with a Class-G charge pump regulator  
based upon proprietary Dual-PumpTM topology. It  
operates from 3.2V to 4.6V supply. When operating  
with 4.2V supply voltage, the ft2820 is capable of  
delivering into 4Ω load with maximum output power of  
4W at 10% THD+N in Non-ALC mode, or a constant  
output power of 3.2W at 0.5% THD+N in ALC mode. Its  
high efficiency, up to 82%, helps extend battery life.  
Filterless Class-D audio amplifier integrated with an  
adaptive Class-G charge pump regulator  
Automatic level control to eliminate output clipping  
Integrated lowpass filter for out-of-band noise  
rejection  
Maximum output power (Non-ALC Mode)  
4.0W (VDD=4.2V, THD+N=10%, RL=4Ω)  
3.2W (VDD=3.6V, THD+N=10%, RL=4Ω)  
Constant output power (ALC Mode)  
3.2W (VDD=4.2V, THD+N=0.5%, RL=4Ω)  
2.8W (VDD=3.6V, THD+N=0.5%, RL=4Ω)  
In ft2820, the power supply rail for the audio amplifier’s  
output stage is internally boosted and regulated at 6V  
by an adaptive charge pump regulator based upon the  
Dual-PumpTM topology, allowing for a much louder  
audio output than a stand-alone one directly connected  
to the battery. It makes ft2820 an ideal audio solution  
for portable devices that are powered by a single-cell  
lithium battery while requiring higher audio loudness.  
High efficiency up to 82%  
Low THD+N: 0.05%  
(VDD=3.6V, f=1kHz, RL=4Ω, Po=1W)  
ALC dynamic range: 10.5dB  
Low quiescent current: 2.7mA @ VDD=3.6V  
High PSRR: 75dB @ 217Hz  
Two gain settings: 24.1/27.6dB  
The ft2820 features automatic level control (ALC) on  
the audio output signals, which detects the output  
clipping caused by the over-level input signal and  
automatically adjusts the voltage gain of the audio  
amplifier to eliminate the clipping while maintaining the  
maximally-allowed dynamic range of the audio output  
signals.  
One-wire pulse control to set operating mode and  
voltage gain  
Auto-recovering short-circuit protection  
Available in TSSOP-20L package  
APPLICATIONS  
Portable Speakers  
Tablets  
Mobile Phones  
Portable Multimedia Devices  
APPLICATION CIRCUIT  
VDD  
C
CF2 2.2uF  
F1 2.2uF  
Cs  
10uF  
CN2  
CVDD CP1 CN1 CP2  
AVDD  
COUT  
10uF  
PVOUT  
Cs  
1uF  
100uF  
PVDD  
PGND  
VOP  
H
ft2820  
EN  
L
INP  
INN  
Cin 470nF  
Cin 470nF  
VON  
GND(AGND/CGND)  
Figure 1: Typical Application Circuit Diagram  
SEP, 2013  
www.fangtek.com.cn  
1

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