TDA7297SA
10W+10W DUAL BRIDGE AMPLIFIER
s
s
WIDE SUPPLY VOLTAGE RANGE (6V-18V)
MINIMUM EXTERNAL COMPONENTS
– NO SWR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
TECHNOLOGY BI20II
s
s
s
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
CLIPWATT15
ORDERING NUMBER: TDA7297SA
DESCRIPTION
The TDA7297SA is a dual bridge amplifier specially
designed for TV and Portable Radio applications.
BLOCK AND APPLICATION DIAGRAM
Pin to pin compatible with: TDA7297, TDA7266B,
TDA7266SA, TDA7266M, TDA7266MA, TDA7266,
& TDA7266S.
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
1/11
TDA7297SA
ABSOLUTE MAXIMUM RATINGS
Symbol
V
s
I
O
Ptot
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
30
0 to 70
-40 to 150
Unit
V
A
W
°C
°C
THERMAL DATA
Symbol
R
th j-case
R
th j-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction to ambient
Value
Typ. = 1.8; Max. = 2.5
48
Unit
°C/W
°C/W
PIN CONNECTION
(Top view)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
OUT2+
OUT2-
VCC
IN2
N.C.
N.C.
S-GND
PW-GND
ST-BY
MUTE
N.C.
IN1
VCC
OUT1-
OUT1+
D03AU1463
ELECTRICAL CHARACTERISTCS
(V
CC
= 13V, 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
THD 10%
P
O
= 1W
P
O
= 0.1W to 2W
f = 100Hz to 15KHz
SVR
CT
A
MUTE
T
w
G
V
∆G
V
Supply Voltage Rejection
Crosstalk
Mute Attenuation
Thermal Threshold
Closed Loop Voltage Gain
Voltage Gain Matching
31
f = 100Hz, V
R
=0.5V
40
46
60
56
60
80
150
32
33
0.5
8.3
10
0.1
0.3
1
R
L
=
∞
Test Condition
Min.
6.5
50
Typ.
Max.
18
65
120
Unit
V
mA
mV
W
%
%
dB
dB
dB
°C
dB
dB
2/11
TDA7297SA
ELECTRICAL CHARACTERISTCS
(continued)
(V
CC
= 13V, R
L
= 8Ω, f = 1KHz, T
amb
= 25°C unless otherwise specified)
Symbol
R
i
VT
MUTE
VT
ST-BY
I
ST-BY
e
N
Parameter
Input Resistance
Mute Threshold
St-by Threshold
St-by Current V6 = GND
Total Output Voltage
A Curve;
f = 20Hz to 20KHz
150
220
Vo = -30dB
Test Condition
Min.
25
2.3
0.8
Typ.
30
2.9
1.3
4.1
1.8
100
500
Max.
Unit
KΩ
V
V
µA
µV
µV
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 guarantee the right St-
by and mute signals sequence. It is quite simple to obtain this function using a microprocessor (Fig. 1 and 2).
At first St-by signal (from
µP)
goes high and the voltage across the St-by terminal (Pin 7) starts to increase ex-
ponentially. The external RC network is intended to turn-on slowly the biasing circuits of 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.
Figure 1. Microprocessor Application
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
3/11
TDA7297SA
Figure 2. Microprocessor Driving Signals
+V
S
(V)
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/mod
B) Low Cost Application
In low cost applications where the
µP
is not present, 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.
4/11
TDA7297SA
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 4. Distortion vs Output Power.
TH D (% )
10
Vc c = 12 V
R l = 8 o hm
1
Figure 5. Distortion vs Frequency
T H D (% )
10
V c c = 16.5V
R l = 8 o hm
1
f = 1 5K Hz
f = 5K Hz
0.1
0.1
P o ut = 1 0 0m W
f = 1K Hz
0.010
100
P o ut = 5W
0.0 1 0
0.1
1
10
1k
10k
20k
P ou t (W )
freq uen cy (H z)
5/11
PCB Design
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