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TPA2008D2_07

更新时间： 2024-11-25 03:58:47
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德州仪器 - TI 放大器功率放大器
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24页 644K
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3-W STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL

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TPA2008D2  
www.ti.com  
SLOS413C–JULY 2003–REVISED MAY 2004  
3-W STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL  
FEATURES  
DESCRIPTION  
•
3 W Per Channel into 3-Ω Speakers  
(THD+N = 10%)  
The TPA2008D2 is a third generation 5-V class-D  
amplifier from Texas Instruments. Improvements to  
previous generation devices include: dc volume con-  
trol, lower supply current, lower noise floor, higher  
efficiency, smaller packaging, and fewer external  
components. Most notably, a new filter-free class-D  
modulation technique allows the TPA2008D2 to di-  
rectly drive the speakers, without needing a low-pass  
output filter consisting of two inductors and three  
capacitors per channel. Eliminating this output filter  
saves approximately 30% in system cost and 75% in  
PCB area.  
– < 0.045% THD at 1.5 W, 1 kHz, 3-Ω Load  
•
•
DC Volume Control With 2-dB Steps From  
-38 dB to 20 dB  
Filter Free Modulation Scheme Operates  
Without a Large and Expensive LC Output  
Filter  
•
Extremely Efficient Third Generation 5-V  
Class-D Technology  
– Low Supply Current, 7 mA  
– Low Shutdown Control, 1 µA  
– Low Noise Floor, -80 dBV  
The improvements and functionality make this device  
ideal for LCD projectors, LCD monitors, powered  
speakers, and other applications that demand more  
battery life, reduced board space, and functionality  
that surpasses currently available class-D devices.  
– Maximum Efficiency into 3 Ω, 78%  
– Maximum Efficiency into 8 Ω, 88%  
– PSRR, -70 dB  
A chip-level shutdown control limits total supply  
current to 1 µA, making the device ideal for bat-  
tery-powered applications. Protection circuitry in-  
creases device reliability: thermal and short circuit.  
Undervoltage shutdown saves battery power for more  
essential devices when battery voltage drops to low  
levels.  
•
•
•
Integrated Depop Circuitry  
Operating Temperature Range, -40°C to 85°C  
Space-Saving, Surface Mount PowerPAD™  
Package  
APPLICATIONS  
The TPA2008D2 is available in a 24-pin TSSOP  
PowerPAD™package.  
•
•
•
•
LCD Projectors  
LCD Monitors  
Powered Speakers  
Battery Operated and Space Constrained  
Systems  
EFFICIENCY  
vs  
TOTAL HARMONIC DISTORTION + NOISE  
vs  
OUTPUT POWER  
OUTPUT POWER  
100  
20  
V
R
= 5 V  
= 3 Ω  
DD  
8 Ω Speaker  
10  
90  
L
4 Ω Speaker  
Gain = 0 dB  
80  
3 Ω Speaker  
70  
f = 1 kHz  
1
60  
50  
40  
f = 20 kHz  
0.1  
0.01  
30  
V
= 5 V  
20  
DD  
f = 20 Hz  
No Filter  
10  
0
0
0.5  
1
1.5  
2
2.5  
3
3.5  
0.01  
0.1  
− Output Power − W  
1
4
P
P
− Output Power − W  
O
O
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.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2003–2004, Texas Instruments Incorporated  
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