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10W AMPLIFIER WITH DC VOLUME CONTROL
TDA7494
10W AMPLIFIER WITH DC VOLUME CONTROL
10W OUTPUT POWER R L =8 W ,
@ THD = 10% V CC = 28V
ST-BY AND MUTE FUNCTIONS
LINEAR VOLUME CONTROL DC COUPLED
WITH POWER OP AMPLIFIER
NO BOUCHEROT CELL
NO ST-BY RC INPUT NETWORK
SIGNAL LINE OUTPUT BEFORE VOLUME
CONTROLLING AND MUTING
3 SWITCHABLE VOLTAGE CONTROLLED
INPUT PINS
SINGLE SUPPLY RANGING UP TO 35V
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
INTERNALLY FIXED GAIN
SOFT CLIPPING
LOW TURN-ON TURN-OFF POP NOISE
MULTIWATT 15 PACKAGE
MULTIPOWER BI50II TECHNOLOGY
Multiwatt15
ORDERING NUMBER: TDA7494
DESCRIPTION
The TDA7494 10W is class AB power amplifier
assembled in the @Multiwatt 15 package, spe-
cially designed for high quality sound, TV applica-
tions.
Features of the TDA7494 include volume control,
3 switchable inputs, Stand-by and mute functions.
BLOCK AND APPLICATION DIAGRAM
3x
470nF
5
6
1
SW
1
13
+V CC
IN 1
IN 2
IN 3
2
14
VOL
PWR
3
470
m
F
PWR GND
MUTE/STBY
PROTECTIONS
OUT
15
2K
SGN GND
8
2
4
3
7
9
10
MONITOR
OUT
SVR
STAND-BY
100K
100K
10K
1
m
F
300nF
300nF
470 m F
D95AU414D
SW CTL
VOL CTL
MUTE
February 1997
1/12
11040358.002.png
TDA7494
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
DC Supply Voltage
35
V
V IN
Maximum Input Voltage
8
Vpp
P tot
Total Power Dissipation (Tamb = 70
°
C)
16
W
T amb
Ambient Operating Temperature Range (1)
-20 to +85
C
T stg ,T j
Storage and Junction Temperature
-40 to 150
C
V 2 ,V 3
Volume CTRL DC voltage
7
V
(1) Operation between -20 to 85 ° C guaranteed by correlation with 0 to 70 ° C.
PIN CONNECTION
15
PWR GND
OUT
+V CC
N.C.
14
13
12
11
N.C.
MUTE
STAND-BY
SGN GND
SVR
IN 2
IN 1
MONITOR OUT
VOLUME CONTROL
SW CTL
IN 3
10
9
8
7
6
5
4
3
2
1
D95AU415A
THERMAL DATA
Symbol
Parameter
Value
Unit
R th j-case
Thermal Resistance Junction-case
Typ = 3.8
Max = 4.8
°
C/W
R th j-amb
Thermal Resistance Junction-ambient
max
35
°
C/W
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V S = 21V, R L =8 W ;R g =50 W ;
T amb =25
°
C; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Voltage Range
11
35
V
I q
Total Quiescent Current
22
50
mA
DCV OS
Output DC Offset Referred to
SVR Potential
No Input Signal
-400
400
mV
V O
Quiescent Output Voltage
V S = 28V
14
V
P O
Output Power
THD = 10%; V CC = 28V, R L =8
W
8
6
10
8
W
THD = 1%; V CC = 28V
THD = 10%; V CC = 21V,
THD = 1%; V CC = 21V,
5
3.5
5.5
4
W
THD = 10%; V CC = 21V, R L =4 W
THD = 1%; V CC = 21V,
5
3.9
7.5
5.5
W
THD = 10%; V CC = 18V,
THD = 1%; V CC = 18V
4.5
3.5
6
4.5
W
THD = 10%; V CC = 18V, R L =8
W
3.5
2.5
3.75
2.85
W
W
2/12
°
°
THD = 1%; V CC = 18V
11040358.003.png
TDA7494
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
THD
Total Harmonic Distortion
P O = 1W; f = 1KHz; Gv = 26dB
0.4
%
I peak
Output Peak Current
(internally limited)
1.4
1.9
A
T op
Operating Temperature
0
70
°
C
V in
Input Signal
2.8
Vrms
G V
Closed Loop Gain
Vol Ctrl > 4.5V
24.5
26
27.5
dB
G vLine
Monitor Out Gain
R LOAD Mon =
8
-3
-1.5
0
dB
A Min V ol
Attenuation at Min Volume
Vol Ctrl < 0.5V
80
dB
BW
0.6
MHz
e N
Total Output Noise
f = 20Hz to 22KHz
Play, max volume
350
700
m
V
f = 20Hz to 22KHz
Play, max attenuation
60
100
m
V
f = 20Hz to 22KHz
Mute
30
50
m
V
SR
Slew Rate
5
8
V/
m
s
R i
Input Resistance
22.5
30
K
W
R Mon
Monitor Output Resistance
1.4
2
3
K
W
R load Mon
Monitor Output Load
30
K
W
SVR
Supply Voltage Rejection
f = 1kHz; max volume
C SVR = 470
36
43
dB
m
A; V RIP =1V RMS
f = 1kHz; max attenuation
C SVR = 470 m A; V RIP =1V RMS
60
73
dB
T M
Thermal Muting
150
°
C
T s
Thermal Shut-down
160
°
C
V ST-BY
Stand-by threshold
2.3
2.5
2.7
V
V MUTE
Mute Threshold
2.3
2.5
2.7
V
Sel #1
Control Voltage
Input #1 selected
0
1
V
Sel #2
Control Voltage
Input #2 selected
2.3
2.7
V
Sel #3
Control Voltage
Input #3 selected
4
5
V
I qST-BY
Quiescent Current @ Stand-by
0.6
1
mA
A MUTE
Mute Attenuation
60
75
dB
I stbyBIAS
Stand-by bias current
Stand by on; V ST-BY = 5V;
V MUTE = 5V;
80
150
m
A
Play or Mute
2
20
m
A
I muteBIAS
Mute bias current
Mute
1.5
10
m
A
Play
0.5
5
m A
I switchBIAS
Switch bias current
Input #1 selected
-0.5
5
m
A
Input #2 selected
1
10
m
A
Input #3 selected
1.5
20
m
A
3/12
11040358.004.png
TDA7494
Figure 1: Test and Application Circuit.
MONITOR
OUT
C3 470nF
4
13
+V CC
SW
1
C2
0.1 m F
IN 1
5
6
1
5K
C4 470nF
C10 470 m F
2
14
IN 2
VOL
PWR
OUT
PGND
3
C5 470nF
IN 3
C1
1000
MUTE/STBY
PROTECTIONS
m
F
+5V
GND
15
S1
TP1
2
8
3
7
9
10
R1
3.3K
4
SVR
2
3
JMP1
R2
3.3K
1
R3 100K
C6
300nF
R4
100K
C7
300nF
C8
470
R5
10K
C9
1 m F
m
F
+5V
VOL
P1
50K
LOG
TP2
+5V
+5V
MUTE
S2
STAND-
BY
S3
GND
SGN GND
D96AU492B
Figure 2: P.C.B. and component layout.
4/12
11040358.005.png
TDA7494
APPLICATION SUGGESTIONS
The recommended values of the external components are those shown on the application circuit of fig-
ure 1. Different values can be used; the following table can help the designer.
COMPONENT
SUGGESTION
VALUE
PURPOSE
LARGER THAN
SUGGESTION
SMALLER THAN
SUGGESTION
R1
3.3K
W
Input switch circuit
Vpin #2 shifted downward Vpin #2 shifted upward
R2
3.3K
W
Input switch circuit
Vpin #2 shifted upward
Vpin #2 shifted downward
R3
100K
W
Input switch time
constant
Larger Input Switch Time Smaller input switch time
R4
100K
W
Volume control time
constant
Larger Volume
Regulation Time
Smaller volume
regulation time
R5
10K
W
Mute time constant
Larger mute on/off time
Smaller mute on/off time
P1
50K
W
Volume control circuit
C1
1000
m
F
Supply voltage bypass
Danger of oscillation
C2
100nF
Supply voltage bypass
Danger of oscillation
C3
470nF
Input DC decoupling
Lower low frequency
cutoff
Higher low frequency
cutoff
C4
470nF
Input DC decoupling
Lower low frequency
cutoff
Higher low frequency
cutoff
C5
470nF
Input DC decoupling
Lower low frequency
cutoff
Higher low frequency
cutoff
C6
300nF
Input- switch time
constant
Larger-Input- switch time Smaller input- switch time
C7
300nF
Volume control time
constant
Larger volume regulation
time
Smaller volume regulation
time
C8
470
m
F
Ripple Rejection
Better SVR
Worse SVR
C9
1
m
F
Mute time constant
Larger mute on/off time
Smaller mute on/off time
C10
470
m
F
Output DC decoupling
Lower low frequency
cutoff
Higher low frequency
cutoff
TYPICAL CHARACTERISTICS: Refer to the Application Circuit of Fig.1 V S = 21V; R L =8 W ; f = 1KHz;
R S =8
W
; Tamb = 25
°
C; R S =50
W
; unless otherwise specified
Figure 3: Output Power vs Supply Voltage
Figure 4: Distortion vs Output Power
P OUT
(W)
D96AU517
d
(%)
D96AU518
14
12
V S =28V
R L =8
W
1
10
8
d=10%
f=15KHz
6
0.1
f=1KHz
d=1%
4
2
0
5
10
15
20
25
30 Vs(V)
0.01
0
2
4
6
8 P OUT (W)
5/12
11040358.001.png

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