tda7261.pdf

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25W MONO AMPLIFIER WITH MUTE/ST-BY
TDA7261
25W MONO AMPLIFIER WITH MUTE/ST-BY
WIDE SUPPLY VOLTAGE RANGE (UP TO
50V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER:
25W @ THD =10%, R L =8 W ,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
Multiwatt 8
ORDERING NUMBER: TDA7261
DESCRIPTION
The TDA7261 is class AB Audio power amplifier
assembled in the Multiwatt package, specially de-
signed for high quality sound application in mono
TV chassis.
Figure 1: Typical Application Circuit
+V S
1000 m F
15K
1 m F
+V S
MUTE/
ST-BY
4
6
2
IN
+
-
3
OUT
1
m
F
4.7 W
RL
100nF
15K
18K
GND
7
+5V
m P
5
1000
m
F
-V S
D94AU088
February 1997
1/9
11041443.002.png
TDA7261
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)
8
N.C.
7
GND
IN
-V S
MUTE/ST-BY
OUTPUT
6
5
4
3
2
+V S
N.C.
1
Tab connected to pin 5
D94AU090
THERMAL DATA
Symbol
Description
Value
Unit
R th j-case
Thermal Resistance Junction-case
Max
2.5
°
C/W
2/9
11041443.003.png
TDA7261
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V S + 20V; R L =8 W ;R s =50 W ;
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
30
mA
P O
Music Output Power (*)
THD = 10%; R L =8
W
;
32
W
V S + 28.5V;
P O
Output Power
;
V S + 16V; R L =4
W
20
25
25
W
W
W
;
V S + 16V; R L =4
W
20
20
W
W
W
THD
Total Harmonic Distortion
R L =8
W
;P O = 1W; f = 1KHz
0.02
%
;
P O = 0.1 to 15W;
f = 100Hz to 15KHz
W
0.5
%
R L =4
W
;P O = 1W; f = 1KHz
0.03
%
;V S + 16V;
P O = 0.1 to 12W;
f = 100Hz to 15KHz
W
1
%
SR
Slew Rate
10
V/
m
s
G V
Closed Loop Voltage Gain
29
30
31
dB
D
G V
Voltage Gain Matching
0.2
dB
e N
Total Input Noise
A Curve
f = 20Hz to 22KHz
2.5
3.5
8
m V
m
V
R i
Input Resistance
15
20
K
W
SVR
Supply Voltage Rejection
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 W and V S = ± 16V with R L =4 W
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.
3/9
THD = 10%
R L =8
THD = 1%
R L =8
R L =8
R L =4
11041443.004.png
TDA7261
APPLICATIONS SUGGESTION
(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.
COMPONENTS
RECOMMENDED
VALUE
PURPOSE
LARGER THAN
RECOMMENDED VALUE
SMALLER THAN
RECOMMENDED VALUE
R1
10K
W
Mute Circuit
Increase of Dz
Biasing Current
R2
15K
W
Mute Circuit
V pin # 4 Shifted Downward V pin # 4 Shifted Upward
R3
18K
W
Mute Circuit
V pin # 4 Shifted Upward
V pin # 4 Shifted Downward
R4
15K
W
Mute Circuit
V pin # 4 Shifted Upward
V pin # 4 Shifted Downward
R5
4.7
W
Frequency Stability Danger of Oscillations
Danger of Oscillations
C1
1
m
F
Input DC
Decoupling
Higher Low Frequency
Cutoff
C2
1
m
F
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Of Time
C3, C5
1000
m
F
Supply Voltage
Bypass
Danger of Oscillations
C4, C6
0.1
m
F
Supply Voltage
Bypass
Danger of Oscillations
C7
0.1
m
F
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
MUTE, STAND-BY TRUTH TABLE
SW1
SW2
A
A
STAND-BY
A
B
STAND-BY
B
B
MUTE
B
A
PLAY
4/9
11041443.005.png
TDA7261
Figure 2: Demo Board Schematic
+V S
R2
15K
C2
1
F
MUTE/
ST-BY
+V S
C3
1000
m
F
C4
100nF
4
6
2
R1
C1 1
m
F
Q1
IN
+
-
3
OUT
SW1
ST-BY
R5
4.7
DZ
R4
15K
R3
18K
C7
100nF
RL
GND
7
SW2
MUTE
5
-V S
D94AU089A
C6
100nF
C5
1000
m
F
Figure 3: P.C. Board And Component Layout of the Demo Board Schematic (1:1 Scale)
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m
11041443.001.png

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