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FT2725 PDF预览

FT2725

更新时间: 2024-02-15 06:05:18
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FANGTEK /
页数 文件大小 规格书
26页 1459K
描述
2X11W Stereo Class-D Audio Power Amplifier with ALC & DRC

FT2725 数据手册

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ft2725  
2X11W Stereo Class-D Audio Power Amplifier  
with ALC & DRC  
GENERAL DESCRIPTION  
FEATURES  
Wide supply voltage range from 3.7V to 9V  
Automatic level control with adjustable threshold  
High efficiency up to 89%  
The ft2725 is a highly efficient 2X11W stereo Class-D  
audio power amplifier with automatic level control (ALC)  
and dynamic range compression (DRC). It operates  
with a wide range of supply voltages from 3.7V to 9V.  
When powered with 9V supply voltage, the ft2725 is  
capable of delivering 11W per channel into a pair of 4Ω  
speakers in a bridge-tied-load (BTL) configuration, or  
15W into a single 3Ω speaker in parallel BTL (PBTL)  
configuration, with 10% THD+N.  
Maximum output power in Non-ALC mode  
(VDD=9V, VALC>0.8*GVDD, 10% THD+N)  
6W/Ch (8Ω load)  
11W/Ch (4Ω load)  
15W (3Ω load in PBTL configuration)  
ALC output power in ALC Mode  
(VDD=9V, VALC=0V, 0.3% THD+N)  
The ft2725 features ALC with an adjustable threshold  
for dynamic range control (DRC). The ALC constantly  
monitors and safeguards the audio outputs against a  
user-defined threshold voltage, preventing output  
clipping distortion, excessive power dissipation, or  
hazardous speaker over-load. Once an over-level  
condition is detected, the ALC lowers the voltage gain  
of the audio amplifiers proportionally to eliminate output  
4.5W/Ch (8Ω load)  
8.5W/Ch (4Ω load)  
11.5W (3Ω load in PBTL configuration)  
Low THD+N: 0.06%  
(VDD=9V, f=1kHz, 4Ω load, Po=5W)  
High PSRR: 76dB @ 1kHz  
Wide ALC dynamic range: 10dB  
Maximum voltage gain: 32.4dB  
Volume fade-in and fade-out  
clipping while maintaining  
a
maximally-allowed  
dynamic range of the audio outputs. The threshold  
voltage of the ALC can be set at either the supply  
voltage or an externally defined value.  
Optional spread-spectrum (SS) audio outputs to  
suppress EMI  
Optional mono mode for PBTL configuration with  
low-impedance audio speakers  
As a filterless Class-D audio amplifier, the ft2725  
features high efficiency (up to 89%), high PSRR (76dB  
at 1kHz), and low EMI emissions, which reduce design  
and manufacturing complexities, lower system cost and  
PCB space.  
Auto-recovering over-current & short-circuit  
protection  
Available in TSSOP-24L package  
In ft2725, comprehensive protection features against  
various operating faults ensure its safe and reliable  
operation.  
APPLICATIONS  
Blue Tooth Speakers  
Performance Audio Speakers  
TV/Monitors  
APPLICATION CIRCUIT  
VDD  
RAVDD 10Ω  
CVDD  
10uF  
CVDD  
220uF  
+
CBYP  
1uF  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
AGND  
BYP  
CINL1 0.33uF  
CINR1  
0.33uF  
RINL1  
RINL2 10K  
10K  
RINR1 10K  
2
3
INNL  
INPL  
INNR  
INNL  
INPL  
INNR  
INPR  
10K  
RINR2  
CINL2  
0.33uF  
CINR2  
0.33uF  
INPR  
CGVDD  
2.2uF  
4
CAVDD  
1uF  
GVDD  
ALC  
AVDD  
ATT  
5
ALC  
ATT  
VDD  
VDD  
6
PVDDL  
VOPL  
PGNDL  
VONL  
PVDDL  
SS  
PVDDR  
VOPR  
PGNDR  
VONR  
PVDDR  
PBTL  
CPVDDL  
1uF  
7
CPVDDR  
1uF  
4.7Ω 10nF  
4.7Ω  
10nF  
8
LSL  
LSR  
9
SPEAKER  
SS  
EN  
10  
11  
12  
SPEAKER  
PBTL  
MUTE  
EN  
MUTE  
ft2725  
Figure 1: Typical Audio Power Amplifier Application Circuit  
DEC, 2017  
www.fangtek.com.cn  
1

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