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

TECHNOLOGY BI20II

Multiwatt 15
ORDERING NUMBER: TDA7297

DESCRIPTION
The TDA7297 is a dual bridge amplifier specially
designed for TV and Portable Radio applications.

BLOCK AND APPLICATION DIAGRAM

VCC
470F
3

0.22F

IN1

100nF

13
1

OUT1+

OUT1-

15

OUT2+

14

OUT2-

ST-BY

S-GND

0.22F
IN2

Vref

12

+
+
-

MUTE

PW-GND

+
D94AU175B

May 1997

1/9

TDA7297
ABSOLUTE MAXIMUM RATINGS
Symbol

Value

Unit

VS

Supply Voltage

20

IO

Output Peak Current (internally limited)

Ptot

Total Power Dissipation (Tcase = 70C)

33

Top

Operating Temperature

0 to 70

-40 to +150

Tstg, Tj

Parameter

Storage and Junction Temperature

THERMAL DATA
Symbol
Rth j-case

Description

Value

Thermal Resistance Junction to case

Typ. 1.4

Unit
Max. 2

C/W

PIN CONNECTION (Top view)

15

OUT2+

14

OUT2-

13

VCC

12

IN2

11

N.C.

10

N.C.

S-GND

PW-GND

ST-BY

MUTE

N.C.

IN1

VCC

OUT1-

OUT1+
D95AU261

ELECTRICAL CHARACTERISTICS (VCC = 16.5V, RL = 8, f = 1kHz, Tamb = 25C 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

2/9

Test Condition

Min.
6.5

RL =
THD = 10%
PO = 1W
PO = 0.1W to 5W
f = 100Hz to 15kHz
f = 100Hz VR = 0.5V

Typ.
50

13

40
46
60

15
0.1

31

56
60
80
150
32

25

30

Max.
18
65
120
0.3
1

33
0.5

Unit
V
mA
mV
W
%
%
dB
dB
dB
C
dB
dB
K

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

Min.
2.3
0.8

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 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 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

Typ.
2.9
1.3
150
220

Max.
4.1
1.8
100
500

Unit
V
V
A
V
V

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.
Its 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 0.22F
IN1

C5
470F
OUT1+

OUT1-

15

OUT2+

14

OUT2-

13

C6
100nF

ST-BY R1 10K

C2
10F

S-GND

9
Vref

C3 0.22F
IN2
MUTE R2 10K

12

+
+
-

C4
1F

PW-GND

+
D95AU258A

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TDA7297
Figure 2: Microprocessor Driving Signals.
+V S(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

PLAY
MUTE

(B) Low Cost Application

In low cost applications where the mP 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

4/9

MUTE

ST-BY

OFF
D96AU259

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.

TDA7297
Figure 3: Stand-alone Low-cost Application.

VCC
IN1

C3 0.22F
R1
47K

IN1
ST-BY

R2
47K

C1
470F
OUT1+

OUT1-

15

OUT2+

14

OUT2-

13

C2
100nF

C4
10F

S-GND

9
Vref

C5 0.22F

12

IN2

+
+
-

MUTE

PW-GND

+
D95AU260

Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1).

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TDA7297
Figure 4: Distortion vs Output Power

Figure 5: Distortion vs Output Power

T HD(%)

THD (% )
10

10

Vcc = 12 V
R l = 8 o hm

V cc = 16.5V
R l = 8 ohm
1

f = 15KH z

f = 15KH z
f = 5K Hz

f = 5KH z
0.1

0.1

f = 1K Hz

f = 1KH z
0.010
0.1

10

20

0.010
0.1

10

Pou t ( W )

Po ut (W )

Figure 7: Frequency Respone

Figure 6: Distortion vs Frequency

Le ve l(d Br)

T HD(%)
10

5 .00 0 0
4 .00 0 0
3 .00 0 0

V cc = 16.5V
R l = 8 o hm

Vc c = 1 6 .5 V
Rl = 8 ohm
Po u t = 1 W

2 .00 0 0

1 .00 0 0
0 .0

P o ut = 100m W

- 1.00 0

0.1
- 2.00 0
- 3.00 0

P o ut = 5W
0.010
100

- 4.00 0
- 5.00 0

1k

10k

20k

10

10 0

1k

10 k

10 0 k

fre q u en cy (Hz )

fre q ue n c y (Hz)

Figure 8: Output Power vs Supply Voltage

Figure 9: Total Power Dissipation & Efficiency vs

Output Power

Po (W )

Ptot(W)

2 0 .0 00

16

1 8 .0 00
1 6 .0 00
1 4 .0 00

14
R l = 8 o hm
f = 1K H z

P tot

12
10

1 2 .0 00

1 0 .0 00
8 .00 00

(%)

d = 10 %

Vcc = 16.5V
Rl = 8ohm (both channels)
f = 1KHz

6 .00 00

d = 1%

4 .00 00

2
2 .00 00

0 .0
6. 000 7.0 00 8.0 00 9. 0 00 10. 00 11 .0 0 12. 00 13. 00 14. 00 15 . 00 16. 00 17. 00 18. 00

Vs(V)

6/9

10 11 12 13 14 15 16

2XPout(W)

80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0

TDA7297
Figure 10: Mute Attenuation vs. V pin.6

Figure 11: Stand-By Attenuation vs Vpin.7

Attenuation (dB)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120

10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1

1.5

2.5

3.5

4.5

Attenuation (dB)

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

2.2

2.4

Vpin.7 (V)

Vpin.6(V)

Figure 12: Quiscent Current vs. Supply Voltage

Iq (mA)
70
65
60
55
50
45
40
35
30
6

10

11

12

13

14

15

16

17

18

Vsupply(V)

7/9

TDA7297
MULTIWATT15 PACKAGE MECHANICAL DATA
DIM.

MIN.

mm
TYP.

MIN.

inch
TYP.

MAX.

0.197

2.65

0.104

1.6

0.063

0.49

0.039
0.55

0.019

0.022

0.66

0.75

0.026

1.02

1.27

1.52

0.040

0.050

0.060

G1

17.53

17.78

18.03

0.690

0.700

0.710

H1

19.6

0.030

0.772

H2

8/9

MAX.

20.2

0.795

21.9

22.2

22.5

0.862

0.874

0.886

L1

21.7

22.1

22.5

0.854

0.870

0.886

L2

17.65

18.1

0.695

L3

17.25

17.5

17.75

0.679

0.689

0.699

L4

10.3

10.7

10.9

0.406

0.421

0.429

L7

2.65

2.9

0.104

4.25

4.55

4.85

0.167

0.179

0.191

M1

4.63

5.08

5.53

0.182

0.200

0.218

0.713

0.114

1.9

2.6

0.075

0.102

S1

1.9

2.6

0.075

0.102

Dia1

3.65

3.85

0.144

0.152

TDA7297

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

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