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%, RL = 8Ω, VS = +20V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW IQ)
FEW EXTERNAL COMPONENTS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
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DESCRIPTION
The TDA7261 is class AB Audio power amplifier
assembled in the Multiwatt package, specially de-
Multiwatt 8
ORDERING NUMBER: TDA7261
signed for high quality sound application in mono
TV chassis.
Figure 1: Typical Application Circuit
+VS
15K
1µF
MUTE/
ST-BY
IN
+5V
2
4
6
1µF
15K
+
3
-
18K
1000µF
+VS
OUT
4.7Ω
RL
100nF
GND
7
µP
5
1000µF
-VS
D94AU088
September 2003
1/9
TDA7261
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
VS
DC Supply Voltage
50
IO
Output Peak Current (internally limited)
4.5
A
Power Dissipation Tcase = 70°C
30
W
-40 to +150
°C
Ptot
Tstg, Tj
Storage and Junction Temperature
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PIN CONNECTION (Top view)
8
N.C.
7
GND
6
IN
5
-VS
4
MUTE/ST-BY
3
OUTPUT
2
+VS
1
N.C.
Tab connected to pin 5
D94AU090
THERMAL DATA
Symbol
Rth j-case
2/9
Description
Thermal Resistance Junction-case
Max
Value
Unit
2.5
°C/W
TDA7261
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS + 20V; RL = 8Ω; Rs =50Ω;
f = 1KHz; Tamb = 25°C, unless otherwise specified.)
Symbol
Parameter
Test Condition
VS
Iq
Supply Range
PO
Music Output Power (*)
THD = 10%; RL = 8Ω ;
VS + 28.5V;
PO
Output Power
THD = 10%
RL = 8Ω ;
VS + 16V; RL = 4Ω
THD = 1%
RL = 8Ω ;
VS + 16V; RL = 4Ω
RL = 8Ω ; PO = 1W; f = 1KHz
Min.
Typ.
+5
Total Quiescent Current
20
Max.
Unit
+22.5
V
30
mA
32
W
25
25
W
W
)
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THD
Total Harmonic Distortion
20
20
0.02
RL = 8Ω ;
PO = 0.1 to 15W;
f = 100Hz to 15KHz
RL = 4Ω ; PO = 1W; f = 1KHz
GV
∆GV
eN
Ri
SVR
Tj
Slew Rate
Closed Loop Voltage Gain
Voltage Gain Matching
Total Input Noise
29
Supply Voltage Rejection
15
fr = 100Hz; Vripple = 0.5VRMS
Thermal Shut-down
Junction Temperature
MUTE FUNCTION [ref: +VS]
Mute / Play Threshold
VTMUTE
Mute Attenuation
AM
STAND-BY FUNCTION [ref: +VS]
VTST-BY
AST-BY
Stand-by / Mute Threshold
Stand-by Attenuation
Iq ST-BY
Quiescent Current @ Stand-by
10
30
0.2
2.5
3.5
A Curve
f = 20Hz to 22KHz
Input Resistance
%
0.5
%
1
%
31
V/µs
dB
0.03
RL = 4Ω ; VS + 16V;
PO = 0.1 to 12W;
f = 100Hz to 15KHz
SR
W
W
%
20
dB
µV
µV
KΩ
60
dB
145
°C
-7
-6
60
90
-3.5
-2.5
110
3
8
-5
V
dB
-1.5
V
dB
mA
Note :
(*) FULL POWER up to. VS = ±22.5V with RL = 8Ω and VS = ±16V with RL = 4Ω
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
TDA7261
APPLICATIONS SUGGESTION
(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown on the demo board schematic. Different values can be used: the following
table can help the designer.
LARGER THAN
RECOMMENDED VALUE
SMALLER THAN
RECOMMENDED VALUE
COMPONENTS
RECOMMENDED
VALUE
R1
10KΩ
Mute Circuit
Increase of Dz
Biasing Current
R2
15KΩ
Mute Circuit
Vpin # 4 Shifted Downward
Vpin # 4 Shifted Upward
R3
18KΩ
Mute Circuit
Vpin # 4 Shifted Upward
Vpin # 4 Shifted Downward
R4
15KΩ
Mute Circuit
Vpin # 4 Shifted Upward
Vpin # 4 Shifted Downward
R5
4.7Ω
Frequency Stability
Danger of Oscillations
Danger of Oscillations
C1
1µF
Input DC
Decoupling
C2
1µF
St-By/Mute Time
Constant
C3, C5
1000µF
Supply Voltage
Bypass
Danger of Oscillations
C4, C6
0.1µF
Supply Voltage
Bypass
Danger of Oscillations
C7
0.1µF
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
PURPOSE
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MUTE, STAND-BY TRUTH TABLE
4/9
SW1
SW2
A
A
STAND-BY
A
B
STAND-BY
B
B
MUTE
B
A
PLAY
Higher Low Frequency
Cutoff
Larger On/Off Time
Smaller On/Of Time
TDA7261
Figure 2: Demo Board Schematic
+VS
R2
15K
R1
C2
1µF
MUTE/
ST-BY
C1 1µF
Q1
IN
C3
1000µF
+VS
2
4
6
C4
100nF
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SW1
ST-BY
+
3
OUT
-
DZ
R4
15K
SW2
MUTE
R5
4.7Ω
C7
100nF
R3
18K
GND
7
RL
5
-VS
D94AU089A
C6
100nF
C5
1000µF
Figure 3: P.C. Board And Component Layout of the Demo Board Schematic (1:1 Scale)
5/9
TDA7261
Figure 4: Quiescent Current vs. Supply Voltage
Figure 5: Output Power vs Supply Voltage
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Figure 6: Distortion vs. Output Power
Figure 7: Supply Voltage Rejection vs. Fequency
Figure 8: Attenuation & Total Quiescent Current
vs. Vpin4 Voltage
Figure 9: Power Dissipation vs. Output Power
6/9
TDA7261
- When Vpin4 is between +VS - 2.5V and +VS
- 6V the final stage current generators are
switched on and the amplifier is in mute
mode.
- When Vpin4 is lower than +VS - 6V the amplifier is play mode.
MUTE STAND-BY FUNCTION
The pin 4 (MUTE/STAND-BY) controls the amplifier status by two different theresholds, referred to
+VS.
- When Vpin4 higher than = +VS - 2.5V the
amplifier is in Stand-by mode and the final
stage generators are off.
Figure 10
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+VS
(V)
20
t
-VS
-20
VIN
(mV)
Vpin4
(V)
VS
VS-2.5
VS-6
VS-10
Iq
(mA)
0
VOUT
(V)
OFF
PLAY
STDBY
PLAY
OFF
STDBY
STDBY
MUTE
D94AU084
MUTE
MUTE
MUTE
7/9
TDA7261
DIM.
A
B
C
E
F
F1
G
G1
H1
H2
L
L2
L3
L4
L5
L5*
L7
S
S1
U
Z
Dia1
MIN.
0.49
0.78
0.68
2.40
17.64
19.6
mm
TYP.
2.54
17.78
MAX.
5
2.65
1.6
0.55
0.85
0.75
2.68
17.92
20.2
20.65
17.35
17.75
10.9
15.75
15.35
2.9
2.6
2.6
0.55
0.85
3.85
MIN.
0.019
0.030
0.027
0.094
0.69
0.772
inch
TYP.
0.10
0.70
MAX.
0.197
0.104
0.063
0.022
0.033
0.029
0.105
0.71
0.795
0.81
0.68
0.699
0.429
0.62
0.60
0.114
0.102
0.102
0.022
0.034
0.152
OUTLINE AND
MECHANICAL DATA
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oMultiwatt8r(Floating)
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20.35
17.05
17.25
10.3
15.45
15.05
2.65
1.9
1.9
0.40
0.70
3.65
17.20
17.5
10.7
0.80
0.67
0.679
0.406
0.61
0.59
0.104
0.075
0.075
0.015
0.028
0.144
0.68
0.689
0.421
*
L5 = with wedged frame std.
L5* = with wedged frame anchor holes.
8/9
TDA7261
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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
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9/9
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