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參數資料
| 型號： | TEA2025D |
| 廠商： | 意法半導體 |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEREO AUDIO AMPLIFIER |
| 中文描述： | 立體聲音頻放大器 |
| 文件頁數： | 5/9頁 |
| 文件大?。?/td> | 82K |
| 代理商： | TEA2025D |
APPLICATION INFORMATION
InputCapacitor
Input capacitor is PNP type allowing source to be
referencedto ground.
In this way no input couplingcapacitor is required.
However, a series capacitor (0.22 uF)to the input
sidecan be useful incase of noise due to variable
resistor contact.
Bootstrap
The bootstrap connection allows to increase the
output swing.
The suggested value for the bootstrapcapacitors
(100uF) avoids a reduction of the output signal
alsoat low frequenciesand low supply voltages.
Voltage Gain Adjust
STEREOMODE
The voltage gain is determined by on-chip resis-
tors R1 and R2 together with the external RfC1
seriesconnected betweenpin 6 (11) and ground.
The frequency response is given approximated
by:
V
OUT
V
IN
=
R1
Rf
+
R2
+
1
JWC1
With Rf=0, C1=100 uF, the gain results 46 dB
with pole at f=32Hz.
THE purpose of Rf is to reduce the gain. It is rec-
ommendedto not reduce it under 36 dB.
BRIDGE MODE
Figure 7
The bridge configuration is realized very easily
thanks to an internal voltage divider which pro-
vides(at pin 1) the CH 1 outputsignal after reduc-
tion. It is enough to connect pin 6 (inverting input
of CH 2) with a capacitor to pin 1 and to connect
to ground the pin7.
The total gain of the bridge is given by:
V
OUT
V
IN
=
R1
Rf
+
R2
+
1
JWC1
(
1
+
R3
R4
R1
R2
+
R4
+
1
JWC1
)
andwith the suggestedvalues (C1 = C2 = 100
μ
F,
Rf=0) means:
Gv = 52 dB
with first pole at f = 32 Hz
Output Capacitors.
The low cut off frequency due to output capacitor
dependingon the loadis given by:
F
L
=
1
2
Π
C
OUT
R
L
with C
OUT
470
μ
F and R
L
= 4 ohm it means F
L
=
80 Hz.
Pop Noise
Most amplifiers similar to TEA 2025B need exter-
nal resistors between DC outputs and ground in
order to optimize the pop on/off performance and
crossoverdistortion.
Figure 9
The TEA 2025B solution allows to save compo-
nents because of such resistors (800 ohm)are in-
cluded into the chip.
Figure 8
TEA2025B - TEA2025D
5/9
相關PDF資料 |
PDF描述 |
|---|---|
| TEA2025 | STEREO AUDIO AMPLIFIER |
| TEA2028-TEA2029 | APPLICATION NOTE |
| TEA2028 | APPLICATION NOTE |
| TEA2028B | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2128 | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TEA2025D013TR | 功能描述:音頻放大器 Stereo Audio Amp RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TEA2025-D16-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:STEREO AUDIO AMPLIFIER |
| TEA2025DL-S20-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:STEREO AUDIO AMPLIFIER |
| TEA2025DL-S20-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:STEREO AUDIO AMPLIFIER |
| TEA2025D-S20-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:STEREO AUDIO AMPLIFIER |
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