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ft2923P PDF预览

ft2923P

更新时间: 2024-01-12 17:34:05
品牌 Logo 应用领域
FANGTEK 电池
页数 文件大小 规格书
27页 1733K
描述
2x4.5W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Tracking AGC

ft2923P 数据手册

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ft2923  
2x4.5W Class-G Stereo Audio Power Amplifier  
with Automatic Level Control & Battery Tracking AGC  
GENERAL DESCRIPTION  
FEATURES  
The ft2923 is a highly efficient 2x4.5W Class-G stereo  
audio power amplifier with automatic level control (ALC)  
and battery tracking AGC. It integrates dual filterless  
Class-D audio amplifiers with an adaptive Class-G  
synchronous boost regulator and operates with a range  
of supply voltages from 3V to 5.5V. When operating  
with 3.6V supply voltage, the ft2923 can deliver an  
output power of 4.5W per channel with 10% THD+N, or  
an ALC output power of 3.5W per channel with 0.3%  
THD+N, into a pair of 4Ω speakers.  
Wide range of supply voltages from 3V to 5.5V  
Filterless Class-D audio amplifier integrated with a  
Class-G synchronous 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=VBAT, THD+N=10%)  
4.5W/Ch (4Ω Load)  
2.7W/Ch (8Ω Load)  
ALC output power (ALC Mode)  
(VBAT=3.6V, ALC=NC, THD+N=0.3%)  
3.5W/Ch (4Ω Load)  
In ft2923, 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  
Class-G operation to regulate the boosted output  
voltage dynamically in response to the voltage level of  
the audio outputs.  
2.0W/Ch (8Ω Load)  
Wide ALC dynamic range: 13dB  
Maximum voltage gain: 30dB  
High efficiency: 76%  
(VBAT=3.6V, 4Ω Load, Po=2W/Ch, both channels driven)  
Volume fade-in and fade-out  
The ft2923 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  
CVBAT  
VDD  
RS1 10Ω  
1uF  
1
2
28  
VBAT  
INNL  
INPL  
AGND  
Cin 0.22uF  
Cin 0.22uF  
20K  
20K  
Rin  
Rin  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
Rin 20K  
Rin 20K  
INNL  
INPL  
INNR  
INPR  
INNR  
INPR  
Cin  
0.22uF  
3
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  
100uF  
+
VKNEE  
ALC  
CPVOUT  
0.1uF  
CPVOUT  
22uF  
SDRIVE  
EN  
EN  
LX  
ft2923  
VDD  
L
2.2uH  
CS  
22uF  
CS  
0.1uF  
Figure 1: Typical Application Circuit of ft2923  
DEC, 2017  
www.fangtek.com.cn  
1

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