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參數(shù)資料
| 型號： | TS4871IS |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MICRO, PLASTIC, SO-8 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 383K |
| 代理商： | TS4871IS |
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TS4871
23/28
We have Rin > 10k
. Let’s take Rin = 10k, then
Rfeed = 28.25k
. We could use for Rfeed = 30k
in normalized value and the gain will be Gv = 6.
In lower frequency we want 20 Hz (-3dB cut off
frequency). Then:
So, we could use for Cin a 1
F capacitor value
which gives 16Hz.
In Higher frequency we want 20kHz (-3dB cut off
frequency). The Gain Bandwidth Product of the
TS4871 is 2MHz typical and doesn’t change when
the amplifier delivers power into the load.
The first amplifier has a gain of:
and the theoretical value of the -3dB cut-off higher
frequency is 2MHz/3 = 660kHz.
We can keep this value or limit the bandwidth by
adding a capacitor Cfeed, in parallel on Rfeed.
Then:
So, we could use for Cfeed a 220pF capacitor
value that gives 24kHz.
Now, we can calculate the value of Cb with the
formula
τb = 50kxCb >> τin = (Rin+Rfeed)xCin
which permits to reduce the pop and click effects.
Then Cb >> 0.8
F.
We can choose for Cb a normalized value of 2.2
F
that gives good results in THD+N and PSRR.
In the following tables, you could find three
another examples with values required for the
demoboard.
Remark : components with (*) marking are
optional.
Application n
°1 : 20Hz to 20kHz bandwidth and
6dB gain BTL power amplifier.
Components :
Application n
°2 : 20Hz to 20kHz bandwidth and
20dB gain BTL power amplifier.
Components :
CIN =
1
2
π RinFCL
------------------------------ = 795nF
Rf eed
Rin
----------------- = 3
C FEED =
1
2
π RFEEDFCH
--------------------------------------- = 265pF
Designator
Part Type
R1
22k / 0.125W
R4
22k / 0.125W
R6
Short Cicuit
R7
330k / 0.125W
R8*
(Vcc-Vf_led)/If_led
C5
470nF
C6
100
F
C7
100nF
C9
Short Circuit
C10
Short Circuit
C12
1
F
S1, S2, S6, S7
2mm insulated Plug
10.16mm pitch
S8
3 pts connector 2.54mm
pitch
P1
PCB Phono Jack
D1*
Led 3mm
U1
TS4871ID or TS4871IS
Designator
Part Type
R1
110k / 0.125W
R4
22k / 0.125W
R6
Short Cicuit
R7
330k / 0.125W
R8*
(Vcc-Vf_led)/If_led
C5
470nF
C6
100
F
C7
100nF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4871IST | 功能描述:音頻放大器 1W Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4872 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RAIL TO RAIL INPUT/OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE |
| TS487-2 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100mW STEREO HEADPHONE AMPLIFIER WITH STANDBY MODE |
| TS4872_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RAIL TO RAIL INPUT/OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE |
| TS4872IJT | 制造商:STMicroelectronics 功能描述: |
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