TDA7264
TDA7264A
25 + 25W STEREO AMPLIFIER WITH MUTE/ST-BY
WIDE SUPPLY VOLTAGE RANGE (UP TO
50V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER:
25 + 25W @ THD =10%, R
L
= 8
, V
S
= +20V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW I
Q
)
FEW EXTERNAL COMPONENTS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
DESCRIPTION
The TDA7264/TDA7264A is class AB dual Audio
power amplifier assembled in the Multiwatt pack-
age, specially designed for high quality sound ap-
plication as Hi-Fi music centers and stereo TV
sets.
April 1999
ORDERING NUMBER: TDA7264 (Multiwatt 8)
TDA7264A (Multiwatt 11)
+5V
18K
15K
IN (L)
1
F
15K
1
F
MUTE/
ST-BY
GND
IN (R)
1
F
4.7
4.7
100nF
100nF
OUT (L)
OUT (R)
1000
F
1000
F
+V
S
2
4
6
7
5
8
1
3
+
+
-
-
D94AU069A
RL (L)
RL (R)
+V
S
-V
S
P
Figure 1: Typical Application Circuit for TDA7264
Multiwatt 8
Multiwatt 11
1/12
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
DC Supply Voltage
50
V
I
O
Output Peak Current (internally limited)
4.5
A
P
tot
Power Dissipation T
case
= 70
C
30
W
T
stg
, T
j
Storage and Junction Temperature
-40 to +150
C
PIN CONNECTION (Top view)
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
Thermal Resistance Junction-case
Max
2
C/W
+5V
18K
15K
IN (L)
1
F
15K
1
F
MUTE/
ST-BY
GND
IN (R)
1
F
4.7
4.7
100nF
100nF
OUT (L)
OUT (R)
1000
F
1000
F
+V
S
3
5
7
9
6
11
2
4
+
+
-
-
D98AU955
RL (L)
RL (R)
-V
S
P
1
Figure 2: Typical Application Circuit for TDA7264A
1
2
3
4
5
6
7
D94AU096
8
IN (1)
GND
IN (2)
-V
S
MUTE/ST-BY
OUTPUT (2)
+V
S
OUTPUT (1)
Tab connected to pin 5
1
2
3
4
5
6
7
9
10
11
8
IN(1)
NOT CONNECTED
GND
NOT CONNECTED
IN(2)
-V
S
STBY/MUTE
OUTPUT(2)
+V
S
OUTPUT(1)
-V
S
TAB CONNECTED TO PIN 6
D98AU956
Multiwatt 8
Multiwatt 11
TDA7264 - TDA7264A
2/12
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V
S
+ 20V; R
L
= 8
; R
s
=50
;
f = 1KHz; T
amb
= 25
C, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Range
+5
+22.5
V
I
q
Total Quiescent Current
80
130
mA
P
O
Music Output Power (*)
THD = 10%; R
L
= 8
;
V
S
+ 22.5V
32
W
P
O
Output Power
THD = 10%
R
L
= 8
;
V
S
+ 16V; R
L
= 4
20
25
25
W
W
THD = 1%
R
L
= 8
;
V
S
+ 16V; R
L
= 4
20
20
W
W
THD
Total Harmonic Distortion
R
L
= 8
; P
O
= 1W; f = 1KHz
0.02
%
R
L
= 8
;
P
O
= 0.1 to 15W;
f = 100Hz to 15KHz
0.5
%
R
L
= 4
; P
O
= 1W; f = 1KHz
0.03
%
R
L
= 4
; V
S
+ 16V;
P
O
= 0.1 to 12W;
f = 100Hz to 15KHz
1
%
C
T
Cross Talk
f = 1KHz
f = 10KHz
70
60
dB
dB
SR
Slew Rate
10
V/
s
G
V
Closed Loop Voltage Gain
29
30
31
dB
G
V
Voltage Gain Matching
0.2
dB
e
N
Total Input Noise
A Curve
f = 20Hz to 22KHz
2.5
3.5
8
V
V
R
i
Input Resistance
15
20
K
SVR
Supply Voltage Rejection
(each channel)
fr = 100Hz; Vripple = 0.5V
RMS
60
dB
T
j
Thermal Shut-down
Junction Temperature
145
C
MUTE FUNCTION [ref: +V
S
]
VT
MUTE
Mute / Play Threshold
-7
-6
-5
V
A
M
Mute Attenuation
60
90
dB
STAND-BY FUNCTION [ref: +V
S
]
VT
ST-BY
Stand-by / Mute Threshold
-3.5
-2.5
-1.5
V
A
ST-BY
Stand-by Attenuation
110
dB
I
q ST-BY
Quiescent Current @ Stand-by
3
mA
Note :
(*) FULL POWER up to. V
S
=
22.5V with R
L
= 8
and V
S
=
16V with R
L
= 4
MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)
1 sec after the application of a sinusoidal input signal of frequency 1KHz.
TDA7264 - TDA7264A
3/12
SW1
ST-BY
R1
DZ
Q1
R3
18K
R4
15K
IN (L)
C1 1
F
R2
15K
C3
1
F
MUTE/
ST-BY
GND
SW2
MUTE
IN (R)
C2 1
F
R5
4.7
R6
4.7
C8
100nF
C9
100nF
OUT (L)
OUT (R)
C7
100nF
C6
1000
F
C5
100nF
C4
1000
F
+V
S
2
4
6
7
5
8
1
3
+
+
-
-
D94AU068B
RL (L)
RL (R)
+V
S
-V
S
Figure 3: Demo Board Schematic TDA7264
Figure 3a: P.C. Board And Component Layout of the Demo Board Schematic TDA7264 (1:1 Scale)
TDA7264 - TDA7264A
4/12
R3
IN (L)
C1
R2
C3
MUTE/
ST-BY
GND
IN (R)
C2
R7
R10
C8
C9
OUT (L)
OUT (R)
C6
C4
+V
S
3
5
7
9
6
11
2
4
+
+
-
-
D98AU957
RL (L)
RL (R)
+V
S
-V
S
1
SW1
R1
DZ
R4
SW2
C7
C5
Q1
ST-BY
MUTE
Figure 4: Demo Board Schematic TDA7264A
Figure 4a: P.C. Board And Component Layout of the Demo Board Schematic TDA7264A (1:1 Scale)
TDA7264A
TDA7264 - TDA7264A
5/12
COMPONENTS
RECOMMENDED
VALUE
PURPOSE
LARGER THAN
RECOMMENDED VALUE
SMALLER THAN
RECOMMENDED VALUE
R1
10K
Mute Circuit
Increase of Dz
Biasing Current
R2
15K
Mute Circuit
V
pin
# 4 Shifted Downward
V
pin
# 4 Shifted Upward
R3
18K
Mute Circuit
V
pin
# 4 Shifted Upward
V
pin
# 4 Shifted Downward
R4
15K
Mute Circuit
V
pin
# 4 Shifted Upward
V
pin
# 4 Shifted Downward
R5, R6
4.7
Frequency Stability
Danger of Oscillations
Danger of Oscillations
C1, C2
1
F
Input DC
Decoupling
Higher Low Frequency
Cutoff
C3
1
F
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Off Time
C4, C6
1000
F
Supply Voltage
Bypass
Danger of Oscillations
C5, C7
0.1
F
Supply Voltage
Bypass
Danger of Oscillations
C8, C9
0.1
F
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
APPLICATIONS SUGGESTION for TDA7264
(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown on the demo board sche-
matic. Different values can be used: the following
table can help the designer.
MUTE, STAND-BY TRUTH TABLE
SW1
SW2
A
A
STAND-BY
A
B
STAND-BY
B
B
MUTE
B
A
PLAY
COMPONENTS
RECOMMENDED
VALUE
PURPOSE
LARGER THAN
RECOMMENDED VALUE
SMALLER THAN
RECOMMENDED VALUE
R1
10K
Mute Circuit
Increase of Dz
Biasing Current
R2
15K
Mute Circuit
V
pin
# 5 Shifted Downward
V
pin
# 5 Shifted Upward
R3
18K
Mute Circuit
V
pin
# 5 Shifted Upward
V
pin
# 5 Shifted Downward
R4
15K
Mute Circuit
V
pin
# 5 Shifted Upward
V
pin
# 5 Shifted Downward
R7, R10
4.7
Frequency Stability
Danger of Oscillations
Danger of Oscillations
C1, C2
1
F
Input DC
Decoupling
Higher Low Frequency
Cutoff
C3
1
F
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Off Time
C4, C6
1000
F
Supply Voltage
Bypass
Danger of Oscillations
C5, C7
0.1
F
Supply Voltage
Bypass
Danger of Oscillations
C8, C9
0.1
F
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
APPLICATIONS SUGGESTION for TDA7264A
(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown are the demo board sche-
matic different values can be used: the following
table can help the designer.
TDA7264 - TDA7264A
6/12
Figure 8: Distortion vs. Output Power
Figure 7: Output Power vs Supply Voltage
Figure 5: Quiescent Current vs. Supply Voltage
Figure 6: Frequency Response
Figure 9: Crosstalk vs. Frequency
Figure 10: Supply Voltage Rejection vs. Fequency
TDA7264 - TDA7264A
7/12
Figure 12: Power Dissipation vs. Output Power
Figure 11: Attenuation& Total Quiescent Cur-
rent vs. V
pin4
Voltage
TDA7264 - TDA7264A
8/12
t
OFF
STDBY
MUTE
MUTE
MUTE
MUTE
PLAY
STDBY
PLAY
OFF
STDBY
20
+V
S
(V)
-20
-V
S
V
IN
(mV)
Vpin4
(V)
V
S
V
S
-2.5
V
S-
6
V
S
-10
I
q
(mA)
0
VOUT
(V)
D94AU084
Figure 13
MUTE STAND-BY FUNCTION
The pin 4 (MUTE/STAND-BY) controls the ampli-
fier status by two different thresholds, referred to
+V
S
.
- When V
pin4
higher than = +V
S
- 2.5V the
amplifier is in Stand-by mode and the final
stage generators are off
- when V
pin4
is between +V
S
- 2.5V and +V
S
- 6V the final stage current generators are
switched on and the amplifier is in mute
mode
- when V
pin4
is lower than +V
S
- 6V the am-
plifier is play mode.
TDA7264 - TDA7264A
9/12
Multiwatt8 (Pin. 5 Gnd)
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
0.063
E
0.49
0.55
0.019
0.022
F
0.78
0.85
0.030
0.033
G
2.40
2.54
2.68
0.094
0.10
0.105
G1
17.64
17.78
17.92
0.69
0.70
0.71
H1
19.6
0.772
H2
20.2
0.795
L
20.35
20.65
0.80
0.81
L2
17.05
17.20
17.35
0.67
0.68
0.68
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
0.114
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
U
0.40
0.55
0.015
0.022
Z
0.70
0.85
0.028
0.034
Dia1
3.65
3.85
0.144
0.152
OUTLINE AND
MECHANICAL DATA
TDA7264 - TDA7264A
10/12
Multiwatt11 V
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
0.063
D
1
0.039
E
0.49
0.55
0.019
0.022
F
0.88
0.95
0.035
0.037
G
1.45
1.7
1.95
0.057
0.067
0.077
G1
16.75
17
17.25
0.659
0.669
0.679
H1
19.6
0.772
H2
20.2
0.795
L
21.9
22.2
22.5
0.862
0.874
0.886
L1
21.7
22.1
22.5
0.854
0.87
0.886
L2
17.4
18.1
0.685
0.713
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
0.114
M
4.25
4.55
4.85
0.167
0.179
0.191
M1
4.73
5.08
5.43
0.186
0.200
0.214
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
OUTLINE AND
MECHANICAL DATA
TDA7264 - TDA7264A
11/12
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 parti es which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification 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
1999 STMicroelectronics Printed in Italy All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
http://www.st.com
TDA7264 - TDA7264A
12/12
PDF 
ZIP