®
TDA7297
15+15W DUAL BRIDGE AMPLIFIER
WIDE SUPPLY VOLTAGE RANGE (6V -18V)
MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
TECHNOLOGY BI20II
Multiwatt 15
DESCRIPTION
The TDA7297 is a dual bridge amplifier specially
designed for TV and Portable Radio applications.
ORDERING NUMBER:
TDA7297
BLOCK AND APPLICATION DIAGRAM
VCC
470µF
0.22µF
IN1
3
4
+
-
ST-BY
7
13
1
OUT1+
100nF
S-GND
9
Vref
-
+
+
-
2
OUT1-
0.22µF
IN2
12
15
OUT2+
MUTE
6
PW-GND
-
8
+
14
OUT2-
D94AU175B
September 2003
1/9
TDA7297
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
I
O
P
tot
T
op
T
stg
, T
j
Supply Voltage
Output Peak Current (internally limited)
Total Power Dissipation (T
case
= 70°C)
Operating Temperature
Storage and Junction Temperature
Parameter
Value
20
2
33
0 to 70
-40 to +150
Unit
V
A
W
°C
°C
THERMAL DATA
Symbol
R
th j-case
Description
Thermal Resistance Junction to case
Typ. 1.4
Value
Max. 2
Unit
°C/W
PIN CONNECTION
(Top view)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D95AU261
OUT2+
OUT2-
VCC
IN2
N.C.
N.C.
S-GND
PW-GND
ST-BY
MUTE
N.C.
IN1
V
CC
OUT1-
OUT1+
ELECTRICAL CHARACTERISTICS
(V
CC
= 16.5V, R
L
= 8Ω, f = 1kHz, T
amb
= 25°C unless otherwise
specified.)
Symbol
V
CC
I
q
V
OS
P
O
THD
Parameter
Supply Range
Total Quiescent Current
Output Offset Voltage
Output Power
Total Harmonic Distortion
Test Condition
R
L
=
∞
THD = 10%
P
O
= 1W
P
O
= 0.1W to 5W
f = 100Hz to 15kHz
f = 100Hz V
R
= 0.5V
13
Min.
6.5
Typ.
50
15
0.1
Max.
18
65
120
0.3
1
Unit
V
mA
mV
W
%
%
dB
dB
dB
°C
dB
dB
KΩ
SVR
CT
A
MUTE
T
W
G
V
∆Gv
R
i
Supply Voltage Rejection
Crosstalk
Mute Attenuation
Thermal Threshold
Closed Loop Voltage Gain
Voltage Gain Matching
Input Resistance
40
46
60
31
25
56
60
80
150
32
30
33
0.5
2/9
TDA7297
ELECTRICAL CHARACTERISTICS
(Continued)
Symbol
VT
MUTE
VT
ST-BY
I
ST-BY
e
N
Parameter
Mute Threshold
St-by Threshold
ST-BY current V6 = GND
Total Output Noise Voltage
Test Condition
V
O
= -30dB
Min.
2.3
0.8
Typ.
2.9
1.3
150
220
Max.
4.1
1.8
100
500
Unit
V
V
µA
µV
µV
A curve
f = 20Hz to 20kHz
APPLICATION SUGGESTION
STAND-BY AND MUTE FUNCTIONS
(A) Microprocessor Application
In order to avoid annoying "Pop-Noise" during
Turn-On/Off transients, it is necessary to guaran-
tee the right St-by and mute signals sequence.
It is quite simple to obtain this function using a mi-
croprocessor (Fig. 1 and 2).
At first St-by signal (from mP) goes high and the
voltage across the St-by terminal (Pin 7) starts to
increase exponentially. The external RC network
is intended to turn-on slowly the biasing circuits of
Figure 1:
Microprocessor Application
the amplifier, this to avoid "POP" and "CLICK" on
the outputs.
When this voltage reaches the St-by threshold
level, the amplifier is switched-on and the external
capacitors in series to the input terminals (C3,
C5) start to charge.
It’s necessary to mantain the mute signal low until
the capacitors are fully charged, this to avoid that
the device goes in play mode causing a loud "Pop
Noise" on the speakers.
A delay of 100-200ms between St-by and mute
signals is suitable for a proper operation.
VCC
C1 0.22µF
IN1
ST-BY R1 10K
C2
10µF
C5
470µF
OUT1+
C6
100nF
4
3
+
-
13
1
7
µP
S-GND
9
Vref
-
+
+
-
6
15
OUT2+
2
OUT1-
C3 0.22µF
IN2
MUTE R2 10K
C4
1µF
12
PW-GND
-
8
+
14
OUT2-
D95AU258A
3/9
TDA7297
Figure 2:
Microprocessor Driving Signals.
+V
S
(V)
+18
V
IN
(mV)
V
ST-BY
pin 7
1.8
1.3
0.8
V
MUTE
pin 6
4.1
2.9
2.3
I
q
(mA)
V
OUT
(V)
OFF
ST-BY
PLAY
MUTE
MUTE
ST-BY
OFF
D96AU259
(B) Low Cost Application
In low cost applications where the mP is not pre-
sent, the suggested circuit is shown in fig.3.
The St-by and mute terminals are tied together
and they are connected to the supply line via an
external voltage divider.
The device is switched-on/off from the supply line
and the external capacitor C4 is intended to delay
the St-by and mute threshold exceeding, avoiding
"Popping" problems.
4/9
TDA7297
Figure 3:
Stand-alone Low-cost Application.
VCC
C1
470µF
OUT1+
C2
100nF
C3 0.22µF
R1
47K
IN1
ST-BY
R2
47K
C4
10µF
4
3
+
-
13
1
7
S-GND
9
Vref
-
+
+
-
15
OUT2+
2
OUT1-
C5 0.22µF
IN2
12
MUTE
6
PW-GND
-
8
+
14
OUT2-
D95AU260A
Figure 3b:
PCB and Component Layout of the Application Circuit (Fig. 1).
5/9
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