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
Multiwatt 8
THERMAL OVERLOAD PROTECTION
ORDERING NUMBER: TDA7261

DESCRIPTION
The TDA7261 is class AB Audio power amplifier signed for high quality sound application in mono
assembled in the Multiwatt package, specially de- TV chassis.
Figure 1: Typical Application Circuit

+VS

1000µF
15K 1µF +VS
MUTE/
ST-BY 2
4
IN 6
+ 3 OUT
1µF -
4.7Ω
RL
100nF
15K 18K
GND 7
+5V µP 5
-VS
1000µF
D94AU088

February 1997 1/9

TDA7261

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit
VS DC Supply Voltage 50 V
IO Output Peak Current (internally limited) 4.5 A
Ptot Power Dissipation T case = 70°C 30 W
Tstg, Tj Storage and Junction Temperature -40 to +150 °C

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 Description Value Unit
Rth j-case Thermal Resistance Junction-case Max 2.5 °C/W

2/9
 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 Min. Typ. Max. Unit
VS Supply Range +5 +22.5 V
Iq Total Quiescent Current 30 mA
PO Music Output Power (*) THD = 10%; R L = 8Ω ; 32 W
VS + 28.5V;
PO Output Power THD = 10%
R L = 8Ω ; 20 25 W
VS + 16V; RL = 4Ω 25 W
THD = 1%
R L = 8Ω ; 20 W
VS + 16V; RL = 4Ω 20 W
THD Total Harmonic Distortion R L = 8Ω ; PO = 1W; f = 1KHz 0.02 %
R L = 8Ω ; 0.5 %
PO = 0.1 to 15W;
f = 100Hz to 15KHz
R L = 4Ω ; PO = 1W; f = 1KHz 0.03 %
R L = 4Ω ; VS + 16V; 1 %
PO = 0.1 to 12W;
f = 100Hz to 15KHz
SR Slew Rate 10 V/µs
GV Closed Loop Voltage Gain 29 30 31 dB
∆GV Voltage Gain Matching 0.2 dB
eN Total Input Noise A Curve 2.5 µV
f = 20Hz to 22KHz 3.5 8 µV
Ri Input Resistance 15 20 KΩ
SVR Supply Voltage Rejection fr = 100Hz; Vripple = 0.5VRMS 60 dB
Tj Thermal Shut-down 145 °C
Junction Temperature
MUTE FUNCTION [ref: +VS]
VTMUTE Mute / Play Threshold -7 -6 -5 V
AM Mute Attenuation 60 90 dB
STAND-BY FUNCTION [ref: +VS]
VTST-BY Stand-by / Mute Threshold -3.5 -2.5 -1.5 V
AST-BY Stand-by Attenuation 110 dB
Iq ST-BY Quiescent Current @ Stand-by 3 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 nents are those shown on the demo board sche-
(Demo Board Schematic) matic. Different values can be used: the following
table can help the designer.
The recommended values of the external compo-

RECOMMENDED LARGER THAN SMALLER THAN

COMPONENTS PURPOSE
VALUE RECOMMENDED VALUE RECOMMENDED VALUE

Increase of Dz
R1 10KΩ Mute Circuit
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

Input DC Higher Low Frequency

C1 1µF
Decoupling Cutoff

St-By/Mute Time
C2 1µF Larger On/Off Time Smaller On/Of Time
Constant

Supply Voltage
C3, C5 1000µF Danger of Oscillations
Bypass

Supply Voltage
C4, C6 0.1µF Danger of Oscillations
Bypass

C7 0.1µF 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
 TDA7261

Figure 2: Demo Board Schematic

+VS

R2 C2 C3 C4
15K 1µF +VS 1000µF 100nF
MUTE/
ST-BY 2
4
C1 1µF
R1 Q1 IN 6
+ 3 OUT
SW1 -
ST-BY R5
DZ R4 R3 4.7Ω RL
15K 18K
C7
100nF
GND 7
SW2
MUTE 5
-VS

C6 C5
100nF 1000µF
D94AU089A

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

Figure 6: Distortion vs. Output Power Figure 7: Supply Voltage Rejection vs. Fequency

Figure 8: Attenuation & Total Quiescent Current Figure 9: Power Dissipation vs. Output Power
vs. Vpin4 Voltage

6/9
 TDA7261

MUTE STAND-BY FUNCTION - When Vpin4 is between +VS - 2.5V and +VS
- 6V the final stage current generators are
The pin 4 (MUTE/STAND-BY) controls the ampli- switched on and the amplifier is in mute
fier status by two different theresholds, referred to mode.
+VS.
- When Vpin4 higher than = +VS - 2.5V the - When Vpin4 is lower than +VS - 6V the am-
amplifier is in Stand-by mode and the final plifier is play mode.
stage generators are off.

Figure 10

+VS
(V)

20

-VS
-20

VIN
(mV)

Vpin4
(V)

VS
VS-2.5
VS-6
VS-10

Iq
(mA)

VOUT
(V)

OFF PLAY STDBY PLAY OFF

STDBY STDBY

MUTE D94AU084 MUTE MUTE MUTE

7/9
TDA7261

MULTIWATT8 PACKAGE MECHANICAL DATA

mm inch
DIM.
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
L1 15.7 0.62
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

8/9
 TDA7261

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-
THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

9/9