TDA7383 STMicroelectronics, TDA7383 Datasheet - Page 7

• Manufacturer Part Number: TDA7383
• Description: IC AMP AUDIO PWR 35W 25FLEXIWATT
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7383

• Output Type: 4-Channel (Quad)
• Max Output Power X Channels @ Load: 35W x 4 @ 4 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: 25-Flexiwatt (bent and staggered leads)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 9: Output Noise vs. Source Resistance
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
tors.
Figure 11: Input/Output Biasing.
200
180
160
140
120
100
80
60
40
1
En ( V)
Vs= 14.4 V
RL= 4 Ohm
10
V
22 - 22K Hz lin.
S
10K
10K
"A" wgtd
100
70K
Rg (Ohm)
SVR
1k
C1 ÷ C4
0.1 F
47 F
100K
100K
10k
C6
IN
100k
resis-
AC_GND
0.1 F
C5
Figure 10: Power Dissipation & Efficiency vs.
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
TO CARRY THE SAME NOMINAL VALUE AND
THEIR TOLERANCE SHOULD NEVER EXCEED
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.
D95AU302
10 %.
400
400
Ptot (W)
+
+
-
-
8K
8K
Output Power
1
, C
2
, C
OTHER CHANNELS
3
, C
TOWARDS
4
, C
5
CAPACITORS HAVE
TDA7383
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