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參數(shù)資料
| 型號(hào)： | TDA7383 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 22 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | FLEXIWATT-25 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 679K |
| 代理商： | TDA7383 |
1
10
100
1k
10k
100k
Rg (Ohm)
40
60
80
100
120
140
160
180
200
En (
V)
Vs= 14.4 V
RL= 4 Ohm
22 - 22K Hz lin.
"A" wgtd
Figure 9: Output Noise vs. Source Resistance
Ptot (W)
Figure 10: Power Dissipation & Efficiency vs.
Output Power
APPLICATION HINTS (ref. to the circuit of fig. 1)
BIASING AND SVR
As shown by fig. 11, all the TDA7383’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 through the internal feedback network.
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 C1, C2, C3, C4, C5 CAPACITORS HAVE
TO CARRY THE SAME NOMINAL VALUE AND
THEIR TOLERANCE SHOULD NEVER EXCEED
±10 %.
Besides its contribution to the ripple rejection, the
SVR capacitor governs the turn ON/OFF time se-
quence and, consequently, plays an essential role
in the pop optimization during ON/OFF transients.
To conveniently serve both needs, ITS MINIMUM
RECOMMENDED VALUE IS 10
F.
+
-
0.1
F
C1 ÷ C4
+
-
8K
8K
400
400
100K
100K
70K
IN
D95AU302
TOWARDS
OTHER CHANNELS
10K
10K
VS
47
F
C6
0.1
F
C5
SVR
AC_GND
Figure 11: Input/Output Biasing.
TDA7383
7/12
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| TDA7388A | 27 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM27 |
| TDA7388 | 26 W, 1 CHANNEL, AUDIO AMPLIFIER, PZIP25 |
| TDA7389A | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM27 |
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|---|---|
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