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ft2925P PDF预览

ft2925P

更新时间: 2024-02-10 01:10:45
品牌 Logo 应用领域
FANGTEK 电池
页数 文件大小 规格书
27页 1706K
描述
2x6W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Tracking AGC

ft2925P 数据手册

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ft2925  
2x6W Class-G Stereo Audio Power Amplifier  
with Automatic Level Control & Battery Tracking AGC  
FEATURES  
GENERAL DESCRIPTION  
Wide range of supply voltages from 3V to 5.5V  
The ft2925 is a highly efficient 2x6W Class-G stereo  
audio power amplifier with automatic level control (ALC)  
and battery tracking AGC. It integrates dual filterless  
Class-D audio amplifiers with a multi-level Class-G  
synchronous boost regulator and operates with a range  
of supply voltages from 3V to 5.5V. When operating  
with a 3.6V supply voltage, the ft2925 can deliver an  
output power of 6W per channel with 10% THD+N, or  
an ALC output power of 4.5W per channel with 0.3%  
THD+N, into a pair of 4Ω speakers.  
Dual filterless Class-D audio amplifiers integrated  
with a multi-level Class-G boost regulator  
Automatic level control to eliminate output clipping  
Battery tracking AGC to prevent battery collapse  
Soft drive mode for EMI reduction  
Maximum output power (Non-ALC Mode)  
(VBAT=3.6V, ALC=High, THD+N=10%)  
6.0W/Ch (4Ω Load)  
3.5W/Ch (8Ω Load)  
ALC output power (ALC Mode)  
In ft2925, the power supply rails of the audio amplifiers’  
output stages are internally boosted and regulated by a  
synchronous PWM switching regulator with two  
integrated power switches. The boost regulator  
employs current-mode PWM control with proprietary  
multi-level Class-G operation to regulate the boosted  
output voltage dynamically in response to the voltage  
level of the audio outputs.  
(VBAT=3.6V, ALC=Low, THD+N=0.3%)  
4.5W/Ch (4Ω Load)  
2.6W/Ch (8Ω Load)  
Wide ALC dynamic range: 12dB  
Maximum voltage gain: 30dB  
High efficiency: 78%  
(VBAT=3.6V, 4Ω Load, Po=2W/Ch, both channels driven)  
Volume fade-in and fade-out  
The ft2925 features ALC function to constantly monitor  
and safeguard the audio outputs against the boosted  
supply voltages, preventing output clipping distortion,  
excessive power dissipation, and speaker over-load.  
Once an over-level condition is detected in either  
channel, the ALC lowers the voltage gain of both audio  
amplifiers together to limit the peak audio outputs.  
Under-voltage lockout protection  
Auto-recovering over-current & short-circuit  
protection  
Thermal over-load protection  
Available in TSSOP-28L package  
APPLICATIONS  
In conjunction with ALC, as the battery supply voltage  
drops below a prescribed value, the battery tracking  
AGC lowers the voltage gain of both audio amplifiers to  
limit the peak audio outputs, preventing the collapse of  
battery voltage.  
Blue Tooth Speakers  
Portable Audio Decks  
Consumer Audio Electronics  
APPLICATION CIRCUIT  
VDD  
CVBAT  
1uF  
RS1 10Ω  
1
28  
VBAT  
INNL  
INPL  
AGND  
Cin 0.22uF  
Cin 0.22uF  
15K  
15K  
Rin  
Rin  
2
3
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
Rin 15K  
Rin 15K  
INNL  
INPL  
INNR  
INPR  
INNR  
INPR  
Cin  
0.22uF  
Cin  
0.22uF  
4
PGND  
VOPL  
VONL  
PVDDL  
AVDD  
BVDD  
NC  
PGND  
VOPR  
VONR  
PVDDR  
PVSNS  
PVOUT  
PVOUT  
PGNDB  
PGNDB  
LX  
LSL  
SPEAKER  
PVDD  
LSR  
5
6
SPEAKER  
PVDD  
7
CPVDDL  
1uF  
8
CPVDDR  
1uF  
CAVDD  
1uF CBVDD  
0.1uF  
9
RS2 10Ω  
10  
11  
12  
13  
14  
CPVOUT  
220uF  
CPVOUT  
0.1uF  
+
VKNEE  
ALC  
SDRIVE  
EN  
EN  
LX  
ft2925  
VDD  
L
3.3uH  
D1 SS34  
CS  
22uF  
CS  
0.1uF  
CPVOUT  
22uF  
Figure 1: Typical Application Circuit Diagram of ft2925  
DEC, 2017  
www.fangtek.com.cn  
1

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