TDA 7295.pdf

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TDA7295
80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIGH OPERATING VOLTAGE RANGE
( ± 40V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 80W MUSIC
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
Multiwatt 15
ORDERING NUMBER: TDA7295
DESCRIPTION
The TDA7295 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
to the high out current capability it is able to sup-
ply the highest power into both 4 W and 8 W 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.
Figure 1: Typical Application and Test Circuit
C7 100nF
+ V s
C6 1000
m
F
R3 22K
C2
22
+Vs
+PWVs
m
F
R2
680
W
IN-
2
7
13
-
14
OUT
C1 470nF
IN+
3
+
C5
22
R1 22K
m
F
6
IN+MUTE
4
BOOTSTRAP
R5 10K
MUTE
STB Y
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
January 2003
1/13
TDA7295
PIN CONNECTION (Top view)
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Supply Voltage
±
40
V
I O
Output Peak Current
6
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
2/13
TDA7295
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 = ± 30V, 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
Operating Supply Range
±
10
±
40
V
I q
Quiescent Current
20
30
65
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 =
±
30V, R L = 8
W
45
45
45
50
50
50
W
W
W
V S =
±
26V, R L = 6
W
V
S =
±
22V, R L = 4
W
Music Power (RMS) (*)
d = 10%;
R L = 8
D
t = 1s
W
; V S =
34V
80
80
W
W
(***) R L = 4
W
; V S =
±
26V
d
Total Harmonic Distortion (**)
P O = 5W; f = 1kHz
P O = 0.1 to 30W; f = 20Hz to 20kHz
0.005
%
%
0.1
W:
P O = 5W; f = 1kHz
P O = 0.1 to 30W; f = 20Hz to 20kHz
±
22V, 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 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 out current
3/13
±
V S =
TDA7295
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.
4/13
TDA7295
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
SUGGESTED
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
BOOTSTRAPPING
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
³
24dB
5/13

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