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参数资料
| 型号： | TPA6047A4RHB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC32 |
| 封装： | PLASTIC, QFN-32 |
| 文件页数： | 13/27页 |
| 文件大小： | 1084K |
| 代理商： | TPA6047A4RHB |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
C
O
C
O
V
OUT
V
OUT
GND
V
DD
V
DD
V
/2
DD
V
BIAS
Conventional
Capacitor-Less
GND
V
DD
V
SS
V
BIAS
DirectPath
TM
Input-Blocking Capacitors
C(DCINPUT-BLOCKING)
1
2
CIN =
(6)
SLOS601 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
Figure 37. Amplifier Applications
DC input-blocking capacitors block the dc portion of the audio source and allow the inputs to properly bias.
Maximum performance is achieved when the inputs of the TPA6047A4 are properly biased. Performance issues
such as pop are optimized with proper input capacitors.
The dc input-blocking capacitors can be removed, provided the inputs are connected differentially and within the
input common-mode range of the amplifier, the audio signal does not exceed ±3 V, and pop performance is
sufficient.
CIN is a theoretical capacitor used for mathematical calculations only. Its value is the series combination of the dc
input-blocking capacitors, C(DCINPUT-BLOCKING). Use Equation 6 to determine the value of C(DCINPUT-BLOCKING). For
example, if CIN is equal to 0.22 F, then C(DCINPUT-BLOCKING) is equal to about 0.47 F.
The two C(DCINPUT-BLOCKING) capacitors form a high-pass filter with the input impedance of the TPA6047A4. Use
Equation 6 to calculate CIN, then calculate the cutoff frequency using CIN and the differential input impedance of
the TPA6047A4, RIN, using Equation 7. Note that the differential input impedance changes with gain. See
Table 1 for input impedance values. The frequency and/or capacitance can be determined when one of the two
values are given.
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA6047A4
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