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
, 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 TDA7261 is class AB Audio power amplifier
assembled in the Multiwatt package, specially de-
signed for high quality sound application in mono
TV chassis.
February 1997
Multiwatt 8
ORDERING NUMBER: TDA7261
+5V
18K
15K
IN
1
F
15K
1
F
MUTE/
ST-BY
GND
4.7
100nF
OUT
1000
F
1000
F
+V
S
2
4
6
7
5
3
+
-
D94AU088
RL
+V
S
-V
S
P
Figure 1: Typical Application Circuit
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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
1
2
3
4
5
6
7
D94AU090
8
N.C.
GND
IN
-V
S
MUTE/ST-BY
OUTPUT
+V
S
N.C.
Tab connected to pin 5
PIN CONNECTION (Top view)
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
Thermal Resistance Junction-case
Max
2.5
C/W
TDA7261
2/9
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
30
mA
P
O
Music Output Power (*)
THD = 10%; R
L
= 8
;
V
S
+ 28.5V;
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
%
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
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.
TDA7261
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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
4.7
Frequency Stability
Danger of Oscillations
Danger of Oscillations
C1
1
F
Input DC
Decoupling
Higher Low Frequency
Cutoff
C2
1
F
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Of Time
C3, C5
1000
F
Supply Voltage
Bypass
Danger of Oscillations
C4, C6
0.1
F
Supply Voltage
Bypass
Danger of Oscillations
C7
0.1
F
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
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.
MUTE, STAND-BY TRUTH TABLE
SW1
SW2
A
A
STAND-BY
A
B
STAND-BY
B
B
MUTE
B
A
PLAY
TDA7261
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R3
18K
IN
C1 1
F
MUTE/
ST-BY
GND
R5
4.7
C7
100nF
OUT
C5
1000
F
C3
1000
F
+V
S
2
4
6
7
5
3
+
-
D94AU089A
RL
+V
S
-V
S
SW1
R1
DZ
Q1
R4
15K
R2
15K
C2
1
F
SW2
C4
100nF
C6
100nF
ST-BY
MUTE
Figure 2: Demo Board Schematic
Figure 3: P.C. Board And Component Layout of the Demo Board Schematic (1:1 Scale)
TDA7261
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