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

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

September 2003

®

1

2

4

Vref

ST-BY

7

IN1

0.22

µ

F

VCC

13

3

D94AU175B

+

-

-

+

OUT1+

OUT1-

15

14

12

MUTE

6

IN2

0.22

µ

F

+

-

-

+

OUT2+

OUT2-

8

9

S-GND

PW-GND

470

µ

F

100nF

BLOCK AND APPLICATION DIAGRAM

Multiwatt 15

ORDERING NUMBER: TDA7297

TECHNOLOGY BI20II

1/9

1

2

3

4

5

6

7

9

10

11

8

N.C.

N.C.

S-GND

PW-GND

ST-BY

MUTE

N.C.

IN1

V

CC

OUT1-

OUT1+

13

14

15

12

OUT2+

OUT2-

VCC

IN2

D95AU261

PIN CONNECTION (Top view)

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V

S

Supply Voltage

20

V

I

O

Output Peak Current (internally limited)

2

A

P

tot

Total Power Dissipation (T

case

= 70

°

C)

33

W

T

op

Operating Temperature

0 to 70

°

C

T

stg

, T

j

Storage and Junction Temperature

-40 to +150

°

C

THERMAL DATA

Symbol

Description

Value

Unit

R

th j-case

Thermal Resistance Junction to case

Typ. 1.4

Max. 2

°

C/W

ELECTRICAL CHARACTERISTICS (V

CC

= 16.5V, R

L

= 8

Ω

, f = 1kHz, T

amb

= 25

°

C unless otherwise

specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

V

CC

Supply Range

6.5

18

V

I

q

Total Quiescent Current

R

L

=

∞

50

65

mA

V

OS

Output Offset Voltage

120

mV

P

O

Output Power

THD = 10%

13

15

W

THD

Total Harmonic Distortion

P

O

= 1W

0.1

0.3

%

P

O

= 0.1W to 5W

f = 100Hz to 15kHz

1

%

SVR

Supply Voltage Rejection

f = 100Hz V

R

= 0.5V

40

56

dB

CT

Crosstalk

46

60

dB

A

MUTE

Mute Attenuation

60

80

dB

T

W

Thermal Threshold

150

°

C

G

V

Closed Loop Voltage Gain

31

32

33

dB

∆

Gv

Voltage Gain Matching

0.5

dB

R

i

Input Resistance

25

30

K

Ω

TDA7297

2/9

1

2

4

Vref

ST-BY

7

IN1

C1 0.22

µ

F

VCC

13

3

D95AU258A

+

-

-

+

OUT1+

OUT1-

15

14

12

MUTE

6

IN2

C3 0.22

µ

F

+

-

-

+

OUT2+

OUT2-

8

9

S-GND

PW-GND

C5

470

µ

F

C6

100nF

R1 10K

C2

10

µ

F

µ

P

R2 10K

C4

1

µ

F

Figure 1: Microprocessor Application

ELECTRICAL CHARACTERISTICS (Continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VT

MUTE

Mute Threshold

V

O

= -30dB

2.3

2.9

4.1

V

VT

ST-BY

St-by Threshold

0.8

1.3

1.8

V

I

ST-BY

ST-BY current V6 = GND

100

µ

A

e

N

Total Output Noise Voltage

A curve
f = 20Hz to 20kHz

150
220

500

µ

V

µ

V

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

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.

TDA7297

3/9

+V

S

(V)

V

IN

(mV)

V

ST-BY

pin 7

I

q

(mA)

ST-BY

MUTE

PLAY

MUTE

ST-BY

+18

1.8

0.8

V

MUTE

pin 6

4.1

2.3

OFF

OFF

D96AU259

V

OUT

(V)

2.9

1.3

Figure 2: Microprocessor Driving Signals.

(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.

TDA7297

4/9

1

2

4

Vref

ST-BY

7

IN1

C3 0.22

µ

F

VCC

13

3

D95AU260A

+

-

-

+

OUT1+

OUT1-

15

14

12

MUTE

6

IN2

C5 0.22

µ

F

+

-

-

+

OUT2+

OUT2-

8

9

S-GND

PW-GND

C1

470

µ

F

C2

100nF

R1

47K

C4

10

µ

F

R2

47K

Figure 3: Stand-alone Low-cost Application.

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

TDA7297

5/9

0.01 0

0 .1

1

1 0

0 .1

1

1 0

2 0

TH D(%)

Vc c = 1 6.5V
R l = 8 ohm

f = 15 KH z

f = 5K H z

f = 1K H z

P out (W )

Figure 4: Distortion vs Output Power

0.0 1 0

0.1

1

10

0.1

1

10

TH D (% )

Vc c = 12 V
R l = 8 o hm

f = 1 5 K H z

f = 5 K H z

f = 1 K H z

P ou t (W )

Figure 5: Distortion vs Output Power

0 .0 10

0 .1

1

1 0

1 0 0

1 k

1 0 k

2 0 k

T H D (% )

V c c = 1 6.5 V
R l = 8 o hm

P o ut = 1 0 0 m W

P o ut = 5 W

fre q ue n c y (H z)

Figure 6: Distortion vs Frequency

-5.00 0

-4.00 0

-3.00 0

-2.00 0

-1.00 0

0.0

1.00 0 0

2.00 0 0

3.00 0 0

4.00 0 0

5.00 0 0

10

10 0

1k

10 k

10 0 k

Le ve l(d B r)

fre q ue nc y (Hz )

V c c = 1 6 .5 V
R l = 8 o h m
P o u t = 1 W

Figure 7: Frequency Respone

0.0

2.00 00

4.00 00

6.00 00

8.00 00

10 .0 00

12 .0 00

14 .0 00

16 .0 00

18 .0 00

20 .0 00

6.0 00 7.0 00 8.0 00 9.0 00 10.00 11 .00 12.00 13.00 14.00 15 .00 16.00 17 .00 18.00

P o(W

)

V s(V )

R l = 8 o h m
f = 1K H z

d = 10 %

d = 1%

Figure 8: Output Power vs Supply Voltage

0

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16

0

2

4

6

8

10

12

14

16

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

Ptot(W)

µ(%)

2XPout(W)

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

P tot

µ

Figure 9: Total Power Dissipation & Efficiency vs

Output Power

TDA7297

6/9

6

7

8

9

10

11

12

13

14

15

16

17

18

30

35

40

45

50

55

60

65

70

Iq (mA)

Vsupply(V)

Figure 12: Quiscent Current vs. Supply Voltage

1

1.5

2

2.5

3

3.5

4

4.5

5

0

10

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

Attenuation (dB)

Vpin.6(V)

Figure 10: Mute Attenuation vs. V pin.6

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0

10

-10
-20
-30
-40
-50
-60
-70
-80
-90

-100
-110
-120

Attenuation (dB)

Vpin.7 (V)

Figure 11: Stand-By Attenuation vs Vpin.7

TDA7297

7/9

Multiwatt15 V

DIM.

mm

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

A

5

0.197

B

2.65

0.104

C

1.6

0.063

D

1

0.039

E

0.49

0.55

0.019

0.022

F

0.66

0.75

0.026

0.030

G

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

0.772

H2

20.2

0.795

L

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

0.713

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

0.114

M

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

S

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

OUTLINE AND

MECHANICAL DATA

TDA7297

8/9

Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics.

All other names are the property of their respective owners

© 2003 STMicroelectronics - All rights reserved

STMicroelectronics GROUP OF COMPANIES

Australia – Belgium - Brazil - Canada - China – Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -

Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States

www.st.com

TDA7297

9/9