TDA7294
100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIGH OPERATING VOLTAGE RANGE
(±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
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
Figure 1:
Typical Application and Test Circuit
MULTIPOWER BCD TECHNOLOGY
Multiwatt15
ORDERING NUMBER:
TDA7294V
to the high out current capability it is able to sup-
ply the highest power into both 4Ω and 8Ω 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.
C7 100nF
R3 22K
C2
22µF
+Vs
R2
680Ω
C1 470nF
R1 22K
IN+MUTE
R5 10K
MUTE
STBY
R4 22K
C3 10µF
C4 10µF
4
10
9
IN-
2
+Vs
C6 1000µF
+PWVs
13
14
OUT
C5
22µF
6
BOOTSTRAP
TDA7294
-
7
IN+
3
+
VM
VSTBY
MUTE
STBY
1
STBY-GND
8
THERMAL
SHUTDOWN
S/C
PROTECTION
15
-PWVs
C8 1000µF
D93AU011
-Vs
C9 100nF
-Vs
February 1996
1/16
TDA7294
PIN CONNECTION
(Top view)
TAB connected to -V
S
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
I
O
P
tot
T
op
T
stg
, T
j
2/16
Output Peak Current
Power Dissipation T
case
= 70°C
Operating Ambient Temperature Range
Storage and Junction Temperature
Parameter
Supply Voltage (No Signal)
Value
±50
10
50
0 to 70
150
Unit
V
A
W
°C
°C
TDA7294
THERMAL DATA
Symbol
R
th j-case
Description
Thermal Resistance Junction-case
Max
Value
1.5
Unit
°C/W
ELECTRICAL CHARACTERISTICS
(Refer to the Test Circuit V
S
=
±35V,
R
L
= 8Ω, G
V
= 30dB;
R
g
= 50
Ω;
T
amb
= 25°C, f = 1 kHz; unless otherwise specified.
Symbol
V
S
I
q
I
b
V
OS
I
OS
P
O
Parameter
Supply Range
Quiescent Current
Input Bias Current
Input Offset Voltage
Input Offset Current
RMS Continuous Output Power
d = 0.5%:
V
S
=
±
35V, R
L
= 8Ω
V
S
=
±
31V, R
L
= 6Ω
V
S
=
±
27V, R
L
= 4Ω
d = 10%
R
L
= 8Ω ; V
S
=
±38V
R
L
= 6Ω ; V
S
=
±33V
R
L
= 4Ω ; V
S
=
±29V
(***)
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 50W; f = 20Hz to 20kHz
V
S
=
±27V,
R
L
= 4Ω:
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 50W; f = 20Hz to 20kHz
SR
G
V
G
V
e
N
f
L
, f
H
R
i
SVR
T
S
V
ST on
V
ST off
ATT
st-by
I
q st-by
V
Mon
V
Moff
ATT
mute
Slew Rate
Open Loop Voltage Gain
Closed Loop Voltage Gain
Total Input Noise
Frequency Response (-3dB)
Input Resistance
Supply Voltage Rejection
Thermal Shutdown
f = 100Hz; V
ripple
= 0.5Vrms
A = curve
f = 20Hz to 20kHz
P
O
= 1W
100
60
75
145
24
7
60
60
60
70
70
70
100
100
100
0.005
0.1
0.01
0.1
10
80
30
1
2
40
5
Test Condition
Min.
±10
20
30
Typ.
Max.
±40
60
500
+10
+100
Unit
V
mA
nA
mV
nA
W
W
W
W
W
W
%
%
%
%
V/µs
dB
dB
µV
µV
kΩ
dB
°C
1.5
3.5
70
90
1
3
1.5
3.5
60
80
V
V
dB
mA
V
V
dB
Music Power (RMS)
IEC268.3 RULES -
∆t
= 1s (*)
d
Total Harmonic Distortion (**)
20Hz to 20kHz
STAND-BY FUNCTION (Ref: -V
S
or GND)
Stand-by on Threshold
Stand-by off Threshold
Stand-by Attenuation
Quiescent Current @ Stand-by
Mute on Threshold
Mute off Threshold
Mute AttenuatIon
MUTE FUNCTION (Ref: -V
S
or GND)
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
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
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
R1 (*)
R2
R3 (*)
R4
SUGGESTED VALUE
22k
680Ω
22k
22k
PURPOSE
INPUT RESISTANCE
LARGER THAN
SUGGESTED
INCREASE INPUT
IMPRDANCE
SMALLER THAN
SUGGESTED
DECREASE INPUT
IMPEDANCE
CLOSED LOOP GAIN DECREASE OF GAIN INCREASE OF GAIN
SET TO 30dB (**)
INCREASE OF GAIN DECREASE OF GAIN
ST-BY TIME
CONSTANT
MUTE TIME
CONSTANT
INPUT DC
DECOUPLING
FEEDBACK DC
DECOUPLING
MUTE TIME
CONSTANT
ST-BY TIME
CONSTANT
BOOTSTRAPPING
LARGER MUTE
ON/OFF TIME
LARGER ST-BY
ON/OFF TIME
LARGER ST-BY
ON/OFF TIME
LARGER MUTE
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
SMALLER MUTE
ON/OFF TIME
HIGHER LOW
FREQUENCY
CUTOFF
HIGHER LOW
FREQUENCY
CUTOFF
SMALLER MUTE
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
SIGNAL
DEGRADATION AT
LOW FREQUENCY
DANGER OF
OSCILLATION
DANGER OF
OSCILLATION
R5
C1
10k
0.47µF
C2
22µF
C3
C4
10µF
10µF
C5
22µF
C6, C8
C7, C9
1000µF
0.1µF
SUPPLY VOLTAGE
BYPASS
SUPPLY VOLTAGE
BYPASS
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE
≥
24dB
5/16
Microcontroller MCU
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