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ST Microelectronics
ST Microelectronics

TDA7297 Datasheet

15+15W DUAL BRIDGE AMPLIFIER


TDA7297 Datasheet Preview


TDA7297
15+15W DUAL BRIDGE AMPLIFIER
WIDE SUPPLY VOLTAGE RANGE (6V -18V)
MINIMUM EXTERNAL COMPONENTS
– NO SWR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
DESCRIPTION
The TDA7297 is a dual bridge amplifier specially
designed for TV and Portable Radio applications.
TECHNOLOGY BI20II
Multiwatt 15
ORDERING NUMBER: TDA7297
BLOCK AND APPLICATION DIAGRAM
0.22µF
IN1
ST-BY
4
7
VCC
3 13
470µF
+ 1 OUT1+
-
100nF
S-GND
9
Vref
0.22µF
IN2
12
MUTE
6
- 2 OUT1-
+
+ 15 OUT2+
-
May 1997
PW-GND
8
- 14 OUT2-
+
D94AU175B
1/9
Page 1

TDA7297
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
IO
Ptot
Top
Tstg, Tj
Parameter
Supply Voltage
Output Peak Current (internally limited)
Total Power Dissipation (Tcase = 70°C)
Operating Temperature
Storage and Junction Temperature
THERMAL DATA
Symbol
Description
Rth j-case Thermal Resistance Junction to case
PIN CONNECTION (Top view)
Value
20
2
33
0 to 70
-40 to +150
Unit
V
A
W
°C
°C
Value
Typ. 1.4
Max. 2
Unit
°C/W
15 OUT2+
14 OUT2-
13 VCC
12 IN2
11 N.C.
10 N.C.
9 S-GND
8 PW-GND
7 ST-BY
6 MUTE
5 N.C.
4 IN1
3 VCC
2 OUT1-
1 OUT1+
D95AU261
ELECTRICAL CHARACTERISTICS (VCC = 16.5V, RL = 8, f = 1kHz, Tamb = 25°C unless otherwise
specified.)
Symbol
VCC
Iq
VOS
PO
THD
Parameter
Supply Range
Total Quiescent Current
Output Offset Voltage
Output Power
Total Harmonic Distortion
SVR
CT
AMUTE
TW
GV
Gv
Ri
Supply Voltage Rejection
Crosstalk
Mute Attenuation
Thermal Threshold
Closed Loop Voltage Gain
Voltage Gain Matching
Input Resistance
Test Condition
RL =
THD = 10%
PO = 1W
PO = 0.1W to 5W
f = 100Hz to 15kHz
f = 100Hz VR = 0.5V
Min.
6.5
13
40
46
60
31
25
Typ.
50
15
0.1
56
60
80
150
32
30
Max.
18
65
120
0.3
1
33
0.5
Unit
V
mA
mV
W
%
%
dB
dB
dB
°C
dB
dB
K
2/9
Page 2

TDA7297
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
VTMUTE
VTST-BY
IST-BY
eN
Parameter
Mute Threshold
St-by Threshold
ST-BY current V6 = GND
Total Output Noise Voltage
Test Condition
VO = -30dB
A curve
f = 20Hz to 20kHz
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
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.
C1 0.22µF
IN1
ST-BY R1 10K
C2
10µF
4
7
VCC
3 13
C5
470µF
+ 1 OUT1+
-
C6
100nF
µP
S-GND
9
C3 0.22µF
IN2
Vref
12
MUTE R2 10K
C4
1µF
6
- 2 OUT1-
+
+ 15 OUT2+
-
PW-GND
8
- 14 OUT2-
+
D95AU258A
3/9
Page 3

TDA7297
Figure 2: Microprocessor Driving Signals.
+VS(V)
+18
VIN
(mV)
VST-BY
pin 7
1.8
1.3
0.8
VMUTE
pin 6
4.1
2.9
2.3
Iq
(mA)
VOUT
(V)
OFF
ST-BY
MUTE
PLAY
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
Page 4
Part Number TDA7297
Manufactur ST Microelectronics
Description 15+15W DUAL BRIDGE AMPLIFIER
Total Page 9 Pages
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