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参数资料
| 型号： | TA2131FN |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.008 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-24 |
| 文件页数： | 17/19页 |
| 文件大小： | 274K |
| 代理商： | TA2131FN |
TA2131FN
2002-04-19
7
2.
Low-Pass Compensation
2-1.
Function
In C-couple type power amplifiers, it is necessary to give the output condenser C a large capacity to
flatten out the frequency characteristics to the low frequency band (this is because the loss in the low
frequency bandwidth becomes larger due to the effect of the high-pass filter comprising C and RL).
Particularly when the headphone load is approximately 16 W and an attempt is being made to achieve
frequency characteristics of ±3 dB at 20 Hz, a large capacity condenser of C = 470 mF is required.
Bearing this situation in mind, a low-pass compensation function was built in to the TA2131FN, and
while reducing the capacity of the output coupling condenser, almost flat (±3 dB) frequency
characteristics in all audible bandwidths (20 Hz to 20 kHz) have been achieved.
Fig.3 shows the low-pass system diagram, and Fig.4 shows the frequency characteristics at each point.
In Fig.4, (a) represents the status lost by the low-pass as a result of the high-pass filter comprising
the headphone load (RL = 16 W) and the output coupling condenser (220 mF) in the C-coupling system.
V (OUT)
V (BST OUT)
V (LPF1)
V (NF1)
V (RL)
V (LPF2)
1
10
100
1 k
10 k
100 k
-60
40
20
0
-20
-40
f
(Hz)
G
V
(dB
)
V (NF2)
Figure 2
During Bass Boost (Frequency Characteristics to Each Terminal)
DAC
OUT
20
k
W
12
13
8
Vref
ADD
Vref
INA
BST2
PWA
PWB
2
6
RL
INB
OUTB
BST
NF2
OUTA
20
k
W
10
k
W
10
k
W
10 k
W
10 k
W 15 kW
10 k
W 15 kW
10 k
W
10 k
W
20 k
W
16
W
220
mF
220
mF
V (OUT)
RL
16
W
20 k
W
20 k
W
1
mF
10
mF
10
mF
V (RL)
Figure 3
Low-Pass Compensation System Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TA2131FNG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Low Current Consumption Headphone Amplifier for Portable MD Player (With Bass Boost Function) |
| TA2132BF | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:AM/FM Radio IC |
| TA2132BP | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:AM/FM Radio IC |
| TA2136F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:TOSHIBA Bipolar Liner Integrated Circuit Silicon Monolithic |
| TA2136FG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Sound Retrieval System; 3D Sound IC |
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