TDA7383 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
TDA7383 Datasheet PDF : 13 Pages
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TDA7383
Figure 9: Output Noise vs. Source Resistance
En (µV)
200
Figure 10: Power Dissipation & Efficiency vs.
Output Power
Ptot (W)
180
160
Vs= 14.4 V
RL= 4 Ohm
140
120
100
22 - 22K Hz lin.
80
) 60
t(s 40
uc 1
"A" wgtd
10
100
1k
10k 100k
Rg (Ohm)
Prod APPLICATION HINTS (ref. to the circuit of fig. 1)
te BIASING AND SVR
le As shown by fig. 11, all the TDA7383’s main sec-
o tions, such as INPUTS, OUTPUTS AND AC-GND
s (pin 16) are internally biased at half Supply Volt-
b age level (Vs/2), which is derived from the Supply
O 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
t(s and represents the connection point of all the in-
verting inputs.
uc Both individual inputs and AC-GND are con-
d nected to Vs/2 (SVR) by means of 100KΩ resis-
ro tors.
lete P Figure 11: Input/Output Biasing.
100KΩ
Obso 0.1µF
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 10µF.
+
-
C1 ÷ C4
8KΩ
IN
400Ω
VS
10KΩ
70KΩ SVR
10KΩ
100KΩ
47µF
C6
400Ω
AC_GND
8KΩ
-
+
0.1µF
C5
D95AU302
TOWARDS
OTHER CHANNELS
7/12
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