TDA7296A
70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
PRODUCT PREVIEW
VERY HIGH OPERATING VOLTAGE RANGE
(
35V)
DMOS POWER STAGE
HIGH OUTPUT POWER (UP TO 60W 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
CLIPPING DETECTION OUTPUT
DESCRIPTION
The TDA7296A 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
and 8
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.
The device provides a circuit for the detection of
clipping in the output stages. The output, on open
collector, is able to drive system with automatic
level control.
This is preliminary information on a new product now in development. Details are subject to change without notice.
June 1996
IN-
2
R2
680
C2
22
F
C1 470nF
IN+
R1 22K
3
R3 22K
-
+
MUTE
STBY
4
VM
VSTBY
10
9
IN+MUTE
MUTE
STBY
R4 22K
THERMAL
SHUTDOWN
S/C
PROTECTION
R5 10K
C3 10
F
C4 10
F
1
STBY-GND
C5
22
F
7
13
14
6
15
8
-Vs
-PWVs
BOOTSTRAP
OUT
+PWVs
+Vs
C9 100nF
C8 1000
F
-Vs
D96AU494
+Vs
C7 100nF
C6 1000
F
CD
5
+5V
Figure 1: Typical Application and Test Circuit
Multiwatt 15
ORDERING NUMBER: TDA7296AV
MULTIPOWER BCD TECHNOLOGY
1/13
+
+
-
+
-
+
CD
BOOTSTRAP
IN+
IN-
+V
S
BOOTSTRAP
OUTPUT
CD
-V
S
BIPOLAR
TRANSCONDUCTANCE
INPUT STAGE
MOS GAIN &
LEVEL SHIFTING
STAGE
MOS OUTPUT STAGE
SHORT CIRCUIT
PROTECTION
D96AU496
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
35
V
I
O
Output Peak Current
5
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
1
2
3
4
5
6
7
9
10
11
8
N.C.
MUTE
STAND-BY
-V
S
(SIGNAL)
+V
S
(SIGNAL)
BOOTSTRAP
CD
SVR
NON INVERTING INPUT
INVERTING INPUT
STAND-BY GND
13
14
15
12
-V
S
(POWER)
OUT
+V
S
(POWER)
N.C.
D96AU495
PIN CONNECTION (Top view)
TDA7296A
2/13
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
=
24V, R
L
= 8
, G
V
= 30dB;
R
g
= 50
; T
amb
= 25
C, f = 1 kHz; unless otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Operating Supply Range
10
35
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
=
24V, R
L
= 8
V
S
=
21V, R
L
= 6
S
=
18V, R
L
= 4
27
27
27
30
30
30
W
W
W
Music Power (RMS) (*)
t = 1s
d = 10%;
R
L
= 8
; V
S
=
29V
R
L
= 6
; V
S
=
24V
R
L
= 4
; V
S
=
22V
60
60
60
W
W
W
d
Total Harmonic Distortion (**)
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 20W; f = 20Hz to 20kHz
0.005
0.1
%
%
V
S
=
18V, R
L
= 4
:
P
O
= 5W; f = 1kHz
P
O
= 0.1 to 20W; f = 20Hz to 20kHz
0.01
0.1
%
%
SR
Slew Rate
7
10
V/
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
5
V
V
f
L
, f
H
Frequency Response (-3dB)
P
O
= 1W
20Hz to 20kHz
R
i
Input Resistance
100
k
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 of f
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
DC Off
Clipping detector OFF.
CD output Duty Cycle
THD = 1%
TBD
%
DC On
Clipping detector On.
CD output Duty Cycle
THD = 10%
TBD
%
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)
TDA7296A
3/13
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.
TDA7296A
TDA7296A
4/13
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
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
F
INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2
22
F
FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3
10
F
MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C4
10
F
ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
C5
22
F
BOOTSTRAPPING
SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8
1000
F
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
C7, C9
0.1
F
SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE
24dB
TDA7296A
5/13
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