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100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7294
100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
40V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 100W MU-
SIC POWER)
MUTING/STAND-BY FUNCTIONS
NO SWITCH ON/OFF NOISE
NO BOUCHEROT CELLS
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
MULTIPOWER BCD TECHNOLOGY
Multiwatt15
ORDERING NUMBER: TDA7294V
to the high out current capability it is able to sup-
ply the highest power into both 4
DESCRIPTION
The TDA7294 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top-
class TV). Thanks to the wide voltage range and
loads
even in presence of poor supply regulation, with
high Supply Voltage Rejection.
The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
W
and 8
W
Figure 1: Typical Application and Test Circuit
C7 100nF
+Vs
C6 1000
m
F
R3 22K
+Vs
+PWVs
C2
22
m
F
R2
680
W
IN-
2
TDA7294
7
13
-
14
OUT
C1 470nF
IN+
3
+
C5
22
R1 22K
m
F
6
IN+MUTE
4
BOOTSTRAP
R5 10K
MUTE
STBY
10
9
VM
VSTBY
MUTE
STBY
THERMAL
SHUTDOWN
S/C
PROTECTION
R4 22K
1
STBY-GND
8
-Vs
15
-PWVs
C3 10
m
F
C4 10
m
F
C9 100nF
C8 1000
m
F
-Vs
D93AU011
February 1996
1/16
VERY HIGH OPERATING VOLTAGE RANGE
(
±
29281159.002.png
TDA7294
PIN CONNECTION (Top view)
TAB connected to -V S
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Supply Voltage (No Signal)
±
50
V
I O
Output Peak Current
10
A
P tot
Power Dissipation T case =70
°
C
50
W
T op
Operating Ambient Temperature Range
0 to 70
C
T stg ,T j
Storage and Junction Temperature
150
C
2/16
°
°
29281159.003.png
TDA7294
THERMAL DATA
Symbol
Description
Value
Unit
R th j-case
Thermal Resistance Junction-case
Max
1.5
°
C/W
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V S = ± 35V, R L =8 W ,G V = 30dB;
R g =50
W
;T amb =25
°
C, f = 1 kHz; unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Range
±
10
±
40
V
I q
Quiescent Current
20
30
60
mA
I b
Input Bias Current
500
nA
V OS
Input Offset Voltage
+10
mV
I OS
Input Offset Current
+100
nA
P O
RMS Continuous Output Power
d = 0.5%:
V S =
±
35V, R L =8
W
60
60
60
70
70
70
W
W
W
V S =
±
31V, R L =6
W
V S =
±
27V, R L =4
W
Music Power (RMS)
IEC268.3 RULES -
D
t = 1s (*)
d = 10%
R L =8
W
;V S =
±
38V
100
100
100
W
W
W
R L =6
W
;V S =
±
33V
R L =4
W
;V S =
±
29V (***)
d
Total Harmonic Distortion (**)
P O = 5W; f = 1kHz
P O = 0.1 to 50W; f = 20Hz to 20kHz
0.005
%
%
0.1
W:
P O = 5W; f = 1kHz
P O = 0.1 to 50W; f = 20Hz to 20kHz
±
27V, R L =4
0.01
%
%
0.1
SR
Slew Rate
7
10
V/
m
s
G V
Open Loop Voltage Gain
80
dB
G V
Closed Loop Voltage Gain
24
30
40
dB
e N
Total Input Noise
A = curve
f = 20Hz to 20kHz
1
2
m
V
5
m
V
f L ,f H
Frequency Response (-3dB)
P O = 1W
20Hz to 20kHz
R i
Input Resistance
100
k
W
SVR
Supply Voltage Rejection
f = 100Hz; V ripple = 0.5Vrms
60
75
dB
T S
Thermal Shutdown
145
°
C
STAND-BY FUNCTION (Ref: -V S or GND)
V ST on
Stand-by on Threshold
1.5
V
V ST off
Stand-by off Threshold
3.5
V
ATT st-by Stand-by Attenuation
70
90
dB
I q st-by
Quiescent Current @ Stand-by
1
3
mA
MUTE FUNCTION (Ref: -V S or GND)
V Mon
Mute on Threshold
1.5
V
V Moff
Mute off Threshold
3.5
V
ATT mute Mute AttenuatIon
60
80
dB
Note (*):
MUSIC POWER CONCEPT
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.
Note (**): Tested with optimized Application Board (see fig. 2)
Note (***): Limited by the max. allowable current.
3/16
V S =
29281159.004.png
TDA7294
Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale)
Note:
The Stand-by and Mute functions can be referred either to GND or -VS.
On the P.C.B. is possible to set both the configuration through the jumper J1.
4/16
29281159.005.png
TDA7294
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1)
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.
COMPONENTS
SUGGESTED VALUE
PURPOSE
LARGER THAN
SUGGESTE D
SMALLER THAN
SUGGESTED
R1 (*)
22k
INPUT RESISTANCE INCREASE INPUT
IMPRDANCE
DECREASE INPUT
IMPEDANCE
R2
680
W
CLOSED LOOP GAIN
SET TO 30dB (**)
DECREASE OF GAIN INCREASE OF GAIN
R3 (*)
22k
INCREASE OF GAIN DECREASE OF GAIN
R4
22k
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
R5
10k
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C1
0.47
m
F
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2
22
m
F
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3
10 m F
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C4
10
m
F
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
C5
22
m
F
BOOT STRAPPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8
1000
m
F
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
C7, C9
0.1
m
F
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE
24dB
5/16
.
29281159.001.png

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