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TPA321_07

更新时间： 2024-11-20 03:58:47
品牌 Logo 应用领域
德州仪器 - TI 放大器功率放大器输入元件
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26页 710K
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350-mW MONO AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS

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TPA321_07 数据手册

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TPA321  
www.ti.com  
SLOS312C–JUNE 2000–REVISED JUNE 2004  
350-mW MONO AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS  
•
•
Fully Specified for 3.3-V and 5-V Operation  
D OR DGN PACKAGE  
(TOP VIEW)  
Wide Power Supply Compatibility  
2.5 V – 5.5 V  
SHUTDOWN  
BYPASS  
IN+  
V -  
1
2
3
4
8
7
6
5
O
•
Output Power for RL = 8 Ω  
– 350 mW at VDD = 5 V  
– 250 mW at VDD = 3.3 V  
GND  
V
DD  
IN-  
V +  
O
•
Ultralow Supply Current in Shutdown  
Mode . . . 0.15 µA  
•
•
Thermal and Short-Circuit Protection  
Surface-Mount Packaging  
– SOIC  
– PowerPAD™ MSOP  
DESCRIPTION  
The TPA321 is a bridge-tied load (BTL) audio power amplifier developed especially for low-voltage applications  
where internal speakers are required. Operating with a 3.3-V supply, the TPA321 can deliver 250 mW of  
continuous power into a BTL 8-Ω load at less than 1% THD+N throughout voice band frequencies. Although this  
device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as cellular  
communications. The BTL configuration eliminates the need for external coupling capacitors on the output in  
most applications, which is particularly important for small battery-powered equipment. This device features a  
shutdown mode for power-sensitive applications with a quiescent current of 0.15 µA during shutdown. The  
TPA321 is available in an 8-pin SOIC surface-mount package and the surface-mount PowerPAD™ MSOP, which  
reduces board space by 50% and height by 40%.  
V
6
5
DD  
V
DD  
R
F
C
S
V /2  
DD  
Audio  
Input  
µ
1
F
R
I
IN -  
IN+  
4
3
V +  
O
-
C
I
+
2
BYPASS  
C
B
µ
0.1  
F
-
350 mW  
V -  
O
8
7
+
GND  
SHUTDOWN  
1
Bias  
Control  
From System Control  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PowerPAD is a trademark of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2000–2004, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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