TDA7268
®
2 x 2W STEREO AUDIO AMPLIFIER
WIDE OPERATING RANGE FROM 4.5V TO 18V
POUT = 2W @ THD 10% 12V/8Ω
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 (IST-BY < 300µA)
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DESCRIPTION
The device TDA7268 is a new technology stereo
Audio Amplifier in DIP package specially de-
POWERDIP (8+8)
ORDERING NUMBER: TDA7268
signed for TV application.
Thanks to the fully complementary output configuration the device delivers a rail to rail voltage
swing without need of boostrap capacitor.
BLOCK DIAGRAM
1
IN1
4
+
2
-
8
IN2
5
+
7
-
SVR
OUT1
VS2
OUT2
3
6
S-GND
September 2003
VS1
9÷16
P-GND
D94AU167B
1/6
TDA7268
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VS
IO
Operating Supply Voltage
Top
Tj
Operating Temperature Range
Junction Temperature
Tstg
Storage Temperature Range
Output Peak Current
Value
Unit
18
V
1.5
A
0 to 70
150
°C
°C
-40 to 125
°C
PIN CONNECTION
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VS1
1
16
PGND
OUT1
2
15
PGND
SVR
3
14
PGND
IN1
4
13
PGND
IN2
5
12
PGND
S-GND
6
11
PGND
OUT2
7
10
PGND
VS2
8
9
PGND
D94AU164A
THERMAL DATA
Symbol
Parameter
Thermal Resistance Junction to ambient (on PCB)
Thermal Resistance Junction to case
Rth j-amb
Rth j-case
THERMAL RESISTANCE JUNCTION TO AMBIENT(˚C/W)
Rth with "on Board" Square Heat Sink vs. Copper
Area
D98AU830
54
52
50
48
46
44
42
40
38
36
34
0
2
4
6
8
10
ON BOARD HEAT-SINK AREA (sq.cm)
2/6
12
Max.
Max.
Value
Unit
70
15
°C/W
°C/W
Example of heatsink using PC board copper
TDA7268
ELECTRICAL CHARACTERISTICS (Tamb = 25°C; VS = 12V; RL = 8Ω; f = 1KHz; unless otherwise specified.)
Symbol
Parameter
VS
Supply Voltage Range
IS
Quiescent Current
Isb
Stand-By Current
VO
AV
Quiescent Output Voltage
Voltage Gain
∆AV
Voltage Gain Matching
RIN
Input Impedance
PO
Output Power
THD
Distortion
SVR
Supply Voltage Rejection
Test Condition
Min.
Typ.
4.5
Unit
18
V
40
60
mA
0.15
0.3
mA
5.5
6
6.5
V
31
32
33
dB
1.0
dB
Pin 3 shorted to GND
THD = 10%
PO = 1W
Max.
50
100
1.9
2
0.1
KΩ
0.4
W
%
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Vrip. = 150mVrms; Frip. = 1KHz
RS = 10kΩ
RS = 50Ω
en
Total Input Noise Voltage
Rg = 10KΩ; BW = 20Hz to 20KHz
CT
Vsb
Cross Talk
Stand-By Enable Voltage
PO = 1W;
ISB < 300µA
Asb
Stand-By Attenution
PO
Output Power
THD = 10%; VS = 9V; RL = 4Ω
40
50
46
50
60
60
80
dB
1.8
W
4
dB
dB
8
µV
dB
1
V
3/6
TDA7268
Fig. 1: Standard Test and Application Circuit
1
C1 0.1µF
IN1
IN1
VS1
VS=12V
C4
100µF
4
+
2
OUT1
-
R1
10K
C5
470µF
8Ω
8
VS2
7
OUT2
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C2 0.1µF
IN2
IN2
5
+
-
R2
10K
SVR
S1
STAND-BY
C6 470µF
3
C3
47µF
8Ω
6
S-GND
9÷16
P-GND
D94AU168D
Note: Add R1 & R2 on demoboard only for DC tests.
Fig. 2: PCB And Components Layout Of The Application Circuit of Figure 1
APPLICATION HINTS:
For 12V supply and 8Ω 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
4/6
- 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 discharge Csvr current.
TDA7268
mm
DIM.
MIN.
a1
0.51
B
0.85
b
b1
TYP.
inch
MAX.
MIN.
TYP.
MAX.
OUTLINE AND
MECHANICAL DATA
0.020
1.40
0.033
0.50
0.38
0.020
0.50
D
0.055
0.015
0.020
20.0
0.787
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o Powerdip
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E
8.80
0.346
e
2.54
0.100
e3
17.78
0.700
F
7.10
0.280
I
5.10
0.201
L
Z
3.30
0.130
1.27
0.050
5/6
TDA7268
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
© 2003 STMicroelectronics - All rights reserved
STMicroelectronics GROUP OF COMPANIES
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www.st.com
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