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參數(shù)資料
| 型號： | TDA7385 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 35 W, 4 CHANNEL, AUDIO AMPLIFIER, PZIP25 |
| 封裝： | FLEXIWATT-25 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大小： | 427K |
| 代理商： | TDA7385 |
TDA7385
Application hints
3
Application hints
Referred to the circuit of Figure 3.
3.1
Biasing and SVR
As shown by Figure 14, all the TDA7385’s main sections, such as Inputs, Outputs AND AC-
GND (pin 16) are internally biased at half supply voltage level (Vs/2), which is derived from
the Supply Voltage Rejection (SVR) block. In this way no current flows through the internal
feedback network. The AC-GND is common to all the 4 amplifiers and represents the
connection point of all the inverting inputs.
Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means of 100 k
Ω
resistors.
To ensure proper operation and high supply voltage rejection, it is of fundamental
importance to provide a good impedance matching between Inputs and AC-GROUND
terminations. This implies 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 sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, its minimum recommended value
is 10F.
Figure 14.
Input/output biasing.
3.2
Input stage
The TDA7385’s inputs are ground-compatible and can stand very high input signals
(± 8 Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1 F) is adopted, the low frequency cut-off
will amount to 16 Hz.
+
-
0.1
μF
C1 ÷ C4
+
-
8K
Ω
8K
Ω
400
Ω
400
Ω
100K
Ω
100K
Ω
70K
Ω
IN
D95AU302
TOWARDS
OTHER CHANNELS
10K
Ω
10K
Ω
VS
47
μF
C6
0.1
μF
C5
SVR
AC_GND
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