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TDA7268
2 x 2W STEREO AUDIO AMPLIFIER
WIDE OPERATING RANGE FROM 4.5V TO 18V
P
OUT
= 2W @ THD 10% 12V/8
INTERNAL FIXED GAIN 32dB
NO FEEDBACK CAPACITOR
NO BOUCHEROT CELL
THERMAL PROTECTION
AC SHORT CIRCUIT PROTECTION
SVR CAPACITOR FOR BETTER RIPPLE
REJECTION
LOW TURN-ON/OFF POP
VERY FEW EXTERNAL COMPONENTS
STAND-BY MODE (I
ST-BY
< 300
A)
DESCRIPTION
The device TDA7268 is a new technology stereo
Audio Amplifier in DIP package specially de-
signed for TV application.
Thanks to the fully complementary output configu-
ration the device delivers a rail to rail voltage
swing without need of boostrap capacitor.
March 1998
IN1
V
S1
OUT1
D94AU167B
IN2
SVR
S-GND
OUT2
P-GND
+
-
+
-
V
S2
1
4
2
8
7
5
3
6
9
16
BLOCK DIAGRAM
ORDERING NUMBER: TDA7268
POWERDIP (8+8)
1/5
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
18
V
I
O
Output Peak Current
1.5
A
T
op
Operating Temperature Range
0 to 70
C
T
j
Junction Temperature
150
C
T
stg
Storage Temperature Range
-40 to 125
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction to ambient (on PCB) Max.
70
C/W
R
th j-case
Thermal Resistance Junction to case Max.
15
C/W
V
S1
OUT1
SVR
IN1
IN2
OUT2
S-GND
1
3
2
4
5
6
7
16
15
14
13
12
10
11
D94AU164A
V
S2
8
PGND
9
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PIN CONNECTION
0
2
4
6
8
10
12
ON BOARD HEAT-SINK AREA (sq.cm)
THERMAL RESISTANCE JUNCTION TO AMBIENT(C/W)
34
36
38
40
42
44
46
48
50
52
54
D98AU830
Rth with "on Board" Square Heat Sink vs. Copper
Area
Example of heatsink using PC board copper
TDA7268
2/5
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C; V
S
= 12V; R
L
= 8
; f = 1KHz; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Range
4.5
18
V
I
S
Quiescent Current
40
60
mA
I
sb
Stand-By Current
Pin 3 shorted to GND
0.15
0.3
mA
V
O
Quiescent Output Voltage
5.5
6
6.5
V
A
V
Voltage Gain
31
32
33
dB
A
V
Voltage Gain Matching
1.0
dB
R
IN
Input Impedance
50
100
K
P
O
Output Power
THD = 10%
1.9
2
W
THD
Distortion
P
O
= 1W
0.1
0.4
%
SVR
Supply Voltage Rejection
V
rip.
= 150mVrms; F
rip.
= 1KHz
R
S
= 10k
R
S
= 50
40
50
46
dB
dB
e
n
Total Input Noise Voltage
Rg = 10K
; BW = 20Hz to
20KHz
4
8
V
CT
Cross Talk
P
O
= 1W;
50
60
dB
V
sb
Stand-By Enable Voltage
I
SB
< 300
A
1
V
A
sb
Stand-By Attenution
60
80
dB
P
O
Output Power
THD = 10%; V
S
= 9V; R
L
= 4
1.8
W
TDA7268
3/5
APPLICATION HINTS:
For 12V supply and 8
speaker application, its
maximum power dissipation is about 2W.
Assumming that max ambient temperature is
70
C. Required thermal resistance of the device
and heat dissipating means must be equal to (150
- 70)/2 = 40
C/W.
Junction to pin thermal resistance of the package
is about 15
C/W.
That means external heat sink of about 25
C/W is
required. Stand-By switches must be able to dis-
charge C
svr
current.
IN1
V
S1
OUT1
D94AU168D
IN2
SVR
S-GND
OUT2
P-GND
+
-
+
-
V
S2
C4
100
F
V
S
=12V
C5
470
F
8
IN1
C6 470
F
8
C2 0.1
F
C3
47
F
IN2
C1 0.1
F
S1
STAND-BY
1
4
2
8
7
5
3
6
9
16
R1
10K
R2
10K
Note: Add R1 & R2 on demoboard only for DC tests.
Fig. 1: Standard Test and Application Circuit
Fig. 2: PCB And Components Layout Of The Application Circuit of Figure 1
TDA7268
4/5
DIP16 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
a1
0.51
0.020
B
0.77
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
3.3
0.130
Z
1.27
0.050
TDA7268
5/5
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