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參數(shù)資料
| 型號： | TDA7381 |
| 廠商： | 意法半導體 |
| 英文描述： | 4 x 25W Quad Bridge Car Radio Amplifier(音頻功率放大器) |
| 中文描述： | 4 × 25瓦四橋汽車收音機放大器（音頻功率放大器） |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 292K |
| 代理商： | TDA7381 |
APPLICATION HINTS
(ref.to the circuit of fig. 1)
BIASING AND SVR
As shown by fig. 3, all the TDA7381’s main sec-
tions, such as INPUTS, OUTPUTS AND AC-GND
(pin 16) are internally biased at half Supply Volt-
age level (Vs/2), which is derived from the Supply
Voltage Rejection (SVR) block. In this way no cur-
rent flows throughthe internalfeedbacknetwork.
The AC-GND is common to all the 4 amplifiers
and represents the connection point of all the in-
verting inputs.
Both individual inputs and AC-GND are con-
nected to Vs/2 (SVR) by means of 100K
resis-
tors.
To ensure proper operation and high supply volt-
age rejection, it is of fundamental importance to
provide a good impedance matching between IN-
PUTS and AC-GROUND terminations. This im-
plies that
C
1
, C
2
, C
3
, C
4
, C
5
CAPACITORSHAVE
TO CARRY THE SAME NOMINAL VALUE AND
THEIR TOLERANCE SHOULD NEVER EXCEED
±
10 %.
Besides its contributionto the ripple rejection, the
SVR capacitor governs the turn ON/OFF time se-
quence and, consequently,playsan essentialrole
in the pop optimization during ON/OFF transients.
To convenientlyserve both needs,
ITS MINIMUM
RECOMMENDED VALUE IS10
μ
F
.
INPUT STAGE
The TDA7381’S inputs are ground-compatible
and can stand very high input signals (
±
8Vpk)
without any performancesdegradation.
If the standard value for the input capacitors
(0.1
μ
F) is adopted, the low frequency cut-off will
amountto 16 Hz.
STAND-BYAND MUTING
STAND-BY and MUTING facilities are both
CMOS-COMPATIBLE. If unused, a straight con-
nectionto Vsof theirrespective pinswould be ad-
missible. Conventional low-power transistors can
be employed to drive muting and stand-by pins in
absence of true CMOS ports or microprocessors.
R-C cells have always to be used in order to
smooth down the transitions for preventing any
audibletransient noises.
Since a DC current of about 10 uA normallyflows
out of pin 22, the maximum allowable muting-se-
ries resistance (R
2
) is 70K
, which is sufficiently
high to permit a muting capacitor reasonably
small(about 1
μ
F).
If R
2
is higher than recommended, the involved
risk will be that the voltage at pin 22 may rise to
above the 1.5 V threshold voltage and the device
will consequently fail to turn OFF when the mute
line is broughtdown.
About the stand-by, the time constant to be as-
signed in order to obtain a virtually pop-free tran-
sitionhas to be slower than 2.5V/ms.
DIAGNOSTICSFACILITY
The TDA7381 is equipped with a diagnostics cir-
cuitry able to detectthe followingevents:
CLIPPINGin the outputstage
OVERHEATING
proximity)
(THERMAL
SHUT-DOWN
+
-
0.1
μ
F
C1
÷
C4
+
-
8K
8K
400
400
100K
100K
70K
IN
D95AU302
TOWARDS
OTHER CHANNELS
10K
10K
V
S
47
μ
F
C6
0.1
μ
F
C5
SVR
AC_GND
Figure 3:
Input/OutputBiasing.
TDA7381
6/10
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7381_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 x 25W quad bridge car radio amplifier |
| TDA7382 | 功能描述:音頻放大器 4X22W Quad Brdg 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 |
| TDA7382音頻功率放大器 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| TDA7383 | 功能描述:音頻放大器 4X30W Quad Brdg 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 |
| TDA7384 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 x 35W QUAD BRIDGE CAR RADIO AMPLIFIER |
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