STMICROELECTRONICS TDA7497

TDA7497
10 + 10W STEREO AMPLIFIER WITH MUTE/ST-BY
PRODUCT PREVIEW
WIDE SUPPLY VOLTAGE RANGE (UP TO
±22V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER:
10 + 10W @ THD =10%, R L = 8Ω, VS = +14V
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 TDA7497 is class AB dual Audio power amplifier assembled in the Multiwatt package, spe-
Multiwatt 8
ORDERING NUMBER: TDA7497
cially designed for high quality sound application
as Hi-Fi music centers and stereo TV sets.
Figure 1: Typical Application Circuit
+V S
15K
1µF
MUTE/
ST-BY
IN (L)
+5V
2
4
6
+
3
-
1µF
15K
1000µF
+VS
18K
OUT (L)
4.7Ω
RL (L)
100nF
GND
7
µP
1µF
IN (R)
8
+
1000µF
1
5
-VS
OUT (R)
4.7Ω
RL (R)
100nF
D94AU069A
September 1995
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA7497
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
±22
V
VS
DC Supply Voltage
IO
Output Peak Current (internally limited)
3
A
Power Dissipation Tcase = 70°C
12
W
-40 to +150
°C
Ptot
Tstg, Tj
Storage and Junction Temperature
PIN CONNECTION (Top view)
8
IN (1)
7
GND
6
IN (2)
5
-VS
4
MUTE/ST-BY
3
OUTPUT (2)
2
+VS
1
OUTPUT (1)
Tab connected to pin 5
D94AU096
THERMAL DATA
Symbol
Rth j-case
2/7
Description
Thermal Resistance Junction-case
Max
Value
Unit
2
°C/W
TDA7497
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS + 14V; RL = 8Ω; Rs = 50Ω;
f = 1KHz; Tamb = 25°C, unless otherwise specified.)
Symbol
VS
Iq
PO
d
Parameter
Supply Range
Total Quiescent Current
Output Power
Test Condition
CT
Cross Talk
SR
GV
Slew Rate
Closed Loop Voltage Gain
∆GV
eN
Voltage Gain Matching
Total Input Noise
A Curve
f = 20Hz to 22KHz
Input Resistance
Supply Voltage Rejection
(each channel)
Tj
Thermal Shut-down
Junction Temperature
MUTE FUNCTION [ref: +VS]
Max.
+20
0.5
29
Ri
SVR
Typ.
80
10
7.5
0.02
d = 10%
d = 1%
PO = 1W
PO = 0.1 to 5W f = 0.1 to 15KHz
f = 1KHz
f = 10KHz
Total Harmonic Distortion
15
fr = 100Hz; Vripple = 0.5VRMS
70
60
10
30
0.2
2.5
3.5
20
60
31
8
Stand-by / Mute Threshold
Stand-by Attenuation
Quiescent Current @ Stand-by
Unit
V
mA
W
W
%
%
dB
dB
V/µs
dB
dB
µV
µV
KΩ
dB
°C
145
Mute / Play Threshold
VTMUTE
AM
Mute Attenuation
STAND-BY FUNCTION [ref: +VS]
VTST-BY
AST-BY
Iq ST-BY
Min.
+5
-7
60
-6
90
-5
V
dB
-3.5
-2.5
110
3
-1.5
V
dB
mA
Note :
(*) FULL POWER up to. VS = ±22.5V with R L = 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.
APPLICATIONS SUGGESTION
(Demo Board Schematic)
The recommended values of the external compoCOMPONENTS
RECOMMENDED
VALUE
R1
10KΩ
Mute Circuit
R2
R3
R4
R5, R6
15KΩ
18KΩ
15KΩ
4.7Ω
C1, C2
1µF
C3
1µF
C4, C6
1000µF
C5, C7
0.1µF
C8, C9
Dz
0.1µF
5.1V
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
PURPOSE
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
SMALLER THAN
RECOMMENDED VALUE
Larger On/Off Time
Smaller On/Off Time
Vpin # 4 Shifted Upward
Vpin # 4 Shifted Downward
Vpin # 4 Shifted Downward
Danger of Oscillations
Higher Low Frequency
Cutoff
Danger of Oscillations
Danger of Oscillations
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TDA7497
Figure 2: Application circuit
+VS
R2
15K
R1
C3
1µF
MUTE/
ST-BY
C1 1µF
T1
IN (L)
C4
1000µF
+VS
2
4
6
+
3
OUT (L)
-
SW1
DZ
R4
15K
R5
4.7Ω
C8
100nF
R3
18K
GND
SW2
C2 1µF
IN (R)
7
8
-
1
+
5
Figure 3: Demo Board Schematic
4/7
C7
100nF
RL (L)
OUT (R)
-VS
D94AU068A
C5
100nF
C6
1000µF
R6
4.7Ω
C9
100nF
RL (R)
TDA7497
MUTE STAND-BY FUNCTION
The pin 4 (MUTE/STAND-BY) controls the amplifier status by two different thresholds, 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 4: Attenuation & Total Quiescent Current vs. Vpin4 Voltage
+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
5/7
TDA7497
MULTIWATT8 PACKAGE MECHANICAL DATA
DIM.
A
B
C
E
F
F1
G
G1
H1
H2
L
L1
L2
L3
L4
L5
L7
S
S1
U
Z
Dia1
6/7
MIN.
0.49
0.78
0.68
2.40
17.64
19.6
mm
TYP.
2.54
17.78
20.35
17.05
17.25
10.3
15.45
2.65
1.9
1.9
0.40
0.70
3.65
15.7
17.20
17.5
10.7
MAX.
5
2.65
1.6
0.55
0.85
0.75
2.68
17.92
MIN.
0.019
0.030
0.027
0.094
0.69
0.772
20.2
20.65
0.80
17.35
17.75
10.9
15.75
2.9
2.6
2.6
0.55
0.85
3.85
0.67
0.679
0.406
0.61
0.104
0.075
0.075
0.015
0.028
0.144
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
0.62
0.68
0.689
0.421
0.68
0.699
0.429
0.62
0.114
0.102
0.102
0.022
0.034
0.152
TDA7497
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. Specifications 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.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
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