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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 = 8, 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 DESCRIPTION The TDA7261 is class AB Audio power amplifier assembled in the Multiwatt package, specially deFigure 1: Typical Application Circuit
Multiwatt 8 ORDERING NUMBER: TDA7261
signed for high quality sound application in mono TV chassis.
+VS 1000F
15K
1F
MUTE/ ST-BY IN 1F
+VS 4 6 + 2
3
OUT 4.7 100nF
RL
15K +5V P
18K
GND
7 5 1000F -VS
D94AU088
February 1997
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TDA7261
ABSOLUTE MAXIMUM RATINGS
Symbol VS IO Ptot Tstg, Tj DC Supply Voltage Output Peak Current (internally limited) Power Dissipation T case = 70C Storage and Junction Temperature Parameter Value 50 4.5 30 -40 to +150 Unit V A W C
PIN CONNECTION (Top view)
8 7 6 5 4 3 2 1 Tab connected to pin 5
D94AU090
N.C. GND IN -VS MUTE/ST-BY OUTPUT +VS N.C.
THERMAL DATA
Symbol Rth j-case Description Thermal Resistance Junction-case Max Value 2.5 Unit C/W
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TDA7261
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS + 20V; RL = 8; Rs =50; f = 1KHz; Tamb = 25C, unless otherwise specified.)
Symbol VS Iq PO PO Parameter Supply Range Total Quiescent Current Music Output Power (*) Output Power THD = 10%; R L = 8 ; VS + 28.5V; THD = 10% R L = 8 ; VS + 16V; RL = 4 THD = 1% R L = 8 ; VS + 16V; RL = 4 THD Total Harmonic Distortion R L = 8 ; PO = 1W; f = 1KHz R L = 8 ; PO = 0.1 to 15W; f = 100Hz to 15KHz R L = 4 ; PO = 1W; f = 1KHz R L = 4 ; VS + 16V; PO = 0.1 to 12W; f = 100Hz to 15KHz SR GV GV eN Ri SVR Tj Slew Rate Closed Loop Voltage Gain Voltage Gain Matching Total Input Noise Input Resistance Supply Voltage Rejection Thermal Shut-down Junction Temperature Mute / Play Threshold Mute Attenuation Stand-by / Mute Threshold Stand-by Attenuation Quiescent Current @ Stand-by -7 60 -3.5 fr = 100Hz; Vripple = 0.5VRMS A Curve f = 20Hz to 22KHz 15 29 10 30 0.2 2.5 3.5 20 60 145 8 31 0.03 1 20 Test Condition Min. +5 30 32 Typ. Max. +22.5 Unit V mA W
25 25 20 20 0.02 0.5
W W W W % %
% %
V/s dB dB V V K dB C
MUTE FUNCTION [ref: +VS] VTMUTE AM VTST-BY AST-BY Iq ST-BY -6 90 -2.5 110 3 -1.5 -5 V dB V dB mA
STAND-BY FUNCTION [ref: +VS]
Note : (*) FULL POWER up to. VS = 22.5V with RL = 8 and VS = 16V with RL = 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.
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TDA7261
APPLICATIONS SUGGESTION (Demo Board Schematic) The recommended values of the external compoCOMPONENTS R1 R2 R3 R4 R5 C1 C2 C3, C5 C4, C6 C7 Dz Q1 RECOMMENDED VALUE 10K 15K 18K 15K 4.7 1F 1F 1000F 0.1F 0.1F 5.1V BC107 PURPOSE Mute Circuit Mute Circuit Mute Circuit Mute Circuit Frequency Stability Input DC Decoupling St-By/Mute Time Constant Supply Voltage Bypass Supply Voltage Bypass Frequency Stability Mute Circuit Mute Circuit Larger On/Off Time
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 Increase of Dz Biasing Current Vpin # 4 Shifted Downward Vpin # 4 Shifted Upward Vpin # 4 Shifted Upward Danger of Oscillations Vpin # 4 Shifted Upward Vpin # 4 Shifted Downward Vpin # 4 Shifted Downward Danger of Oscillations Higher Low Frequency Cutoff Smaller On/Of Time Danger of Oscillations Danger of Oscillations SMALLER THAN RECOMMENDED VALUE
MUTE, STAND-BY TRUTH TABLE
SW1 A A B B SW2 A B B A STAND-BY STAND-BY MUTE PLAY
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TDA7261
Figure 2: Demo Board Schematic
+VS R2 15K C2 1F C1 1F C3 1000F C4 100nF
MUTE/ ST-BY IN
+VS 4 6 + 2
R1 SW1 ST-BY
Q1
3
OUT R5 4.7 C7 100nF
DZ
R4 15K SW2 MUTE
R3 18K GND 7 5 -VS C6 100nF C5 1000F
RL
D94AU089A
Figure 3: P.C. Board And Component Layout of the Demo Board Schematic (1:1 Scale)
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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 vs. Vpin4 Voltage
Figure 9: Power Dissipation vs. Output Power
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TDA7261
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. - 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.
Figure 10
+VS (V) 20
t -VS -20
VIN (mV)
Vpin4 (V) VS VS-2.5 VS-6 VS-10
Iq (mA)
0
VOUT (V)
OFF STDBY MUTE
PLAY
STDBY
PLAY
OFF STDBY
D94AU084
MUTE
MUTE
MUTE
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TDA7261
MULTIWATT8 PACKAGE MECHANICAL DATA
DIM. A B C E F G G1 H1 H2 L L1 L2 L3 L4 L7 S S1 U Z Dia1 17.05 17.25 10.3 2.65 1.9 1.9 0.40 0.70 3.65 20.35 15.7 17.20 17.5 10.7 17.35 17.75 10.9 2.9 2.6 2.6 0.55 0.85 3.85 0.67 0.679 0.406 0.104 0.075 0.075 0.015 0.028 0.144 0.49 0.78 2.40 17.64 19.6 20.2 20.65 0.80 0.62 0.68 0.689 0.421 0.68 0.699 0.429 0.114 0.102 0.102 0.022 0.034 0.152 2.54 17.78 mm MIN. TYP. MAX. 5 2.65 1.6 0.55 0.85 2.68 17.92 0.019 0.030 0.094 0.69 0.772 0.795 0.81 0.10 0.70 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.022 0.033 0.105 0.71
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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. SGSTHOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 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.
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