Datasheet TDA7297 Datasheet (SGS Thomson Microelectronics)

TDA7297

15+15W DUAL BRIDGE AMPLIFIER

WIDESUPPLYVOLTAGERANGE(6V -18V)
MINIMUMEXTERNALCOMPONENTS

– NOSWR CAPACITOR
– NOBOOTSTRAP
– NOBOUCHEROTCELLS
– INTERNALLYFIXEDGAIN

STAND-BY & MUTEFUNCTIONS
SHORTCIRCUITPROTECTION
THERMALOVERLOADPROTECTION

DESCRIPTION

The TDA7297 is a dual bridge amplifier specially
designed for TV and PortableRadio applications.

BLOCK AND APPLICATION DIAGRAM

0.22µF

IN1

ST-BY 7

4

TECHNOLOGYBI20II

Multiwatt 15

ORDERING NUMBER: TDA7297

V

CC

133

+

-

1

470µF 100nF

OUT1+

May 1997

S-GND

0.22µF

IN2

MUTE 6

PW-GND

9

12

8

Vref

15

14

2

OUT1-

OUT2+

OUT2-

D94AU175B

1/9

-

+

+

-

-

+

TDA7297

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I
P
T

T

stg,Tj

THERMAL DATA

Symbol Description Value Unit

R

th j-case

Supply Voltage 20 V

S

Output Peak Current (internally limited) 2 A

O

Total Power Dissipation (T

tot

Operating Temperature 0 to 70

op

=70°C) 33 W

case

Storage and Junction Temperature -40 to +150 °C

Thermal Resistance Junction to case Typ. 1.4 Max. 2

°

C/W

°

C

PIN CONNECTION

ELECTRICAL CHARACTERISTICS (VCC= 16.5V, RL=8Ω, f = 1kHz, T

(Top view)

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

D95AU261

OUT2+
OUT2­VCC
IN2
N.C.
N.C.
S-GND
PW-GND
ST-BY
MUTE
N.C.
IN1
V

CC

OUT1­OUT1+

amb

=25°C unless otherwise

specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

CC

I

q

V

OS

P

O

THD Total Harmonic Distortion P

SVR Supply Voltage Rejection f = 100Hz V

CT Crosstalk 46 60 dB

A

MUTE

T

W

G

V

∆Gv Voltage Gain Matching 0.5 dB

R

Supply Range 6.5 18 V
Total Quiescent Current RL= ∞ 50 65 mA
Output Offset Voltage 120 mV
Output Power THD = 10% 13 15 W

= 1W 0.1 0.3 %

O

P

= 0.1W to 5W

O

f = 100Hz to 15kHz

= 0.5V 40 56 dB

R

Mute Attenuation 60 80 dB
Thermal Threshold 150 °C
Closed Loop Voltage Gain 31 32 33 dB

Input Resistance 25 30 K

i

1%

Ω

2/9

TDA7297

ELECTRICALCHARACTERISTICS

Symbol Parameter Test Condition Min. Typ. Max. Unit

VT
VT

MUTE

ST-BY

I

ST-BY

e

N

Mute Threshold VO= -30dB 2.3 2.9 4.1 V
St-by Threshold 0.8 1.3 1.8 V
ST-BY current V6 = GND 100
Total Output Noise Voltage A curve

APPLICATIONSUGGESTION

STAND-BYAND MUTE FUNCTIONS

(A) MicroprocessorApplication

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 functionusing 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

(Continued)

f = 20Hz to 20kHz

150
220 500

the amplifier, this to avoid ”POP” and ”CLICK” on
the outputs.

When this voltage reaches the St-by threshold
level, the amplifier is switched-onand the external
capacitors in series to the input terminals (C3,
C5) start to charge.

It’s necessaryto 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 properoperation.

Figure 1: MicroprocessorApplication

V

CC

µ
µ

µV

A
V

µP

IN1

ST-BY

IN2

MUTE

C1 0.22µF

R1 10K

C2

10µF

C3 0.22µF

R2 10K

C4

1µF

PW-GND

S-GND

4

7

9

12

6

8

Vref

133

15

14

1

OUT1+

2

OUT1-

OUT2+

OUT2-

+

-

-

+

+

-

-

+

C5

470µF

D95AU258A

C6

100nF

3/9

TDA7297

Figure 2:

MicroprocessorDriving Signals.

+VS(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

MUTE

PLAY MUTE ST-BY

(B) Low Cost Application

In low cost applications where the mP is not pre­sent, the suggestedcircuit is shown in fig.3.

The St-by and mute terminals are tied together
and they are connected to the supply line via an

OFF

D96AU259

externalvoltage 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-aloneLow-costApplication.

IN1

R1

47K

R2

47K

C4

10µF

C3 0.22µF

IN1

ST-BY

S-GND

C5 0.22µF

IN2

MUTE

4

7

9

12

6

Vref

V

CC

133

+

-

-

+

+

-

1

2

15

C1

470µF

OUT1+

OUT1-

OUT2+

C2

100nF

Figure 3b:

PW-GND

-

8

+

14

PCB and ComponentLayout of the Application Circuit (Fig. 1).

OUT2-

D95AU260

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TDA7297

Figure 4:

THD(%)

10

0.1

0.010

Figure 6:

THD(%)

10

1

0.1

0.010
100 1k 10k 20k

Distortionvs OutputPower

Vcc = 16.5V

1

0.1 1 10 20

Rl = 8 ohm

f = 15K Hz

f=5KHz

f=1KHz

Pout (W)

Distortionvs Frequency

Vcc = 16.5V
Rl = 8 ohm

Pout = 100mW

Pout = 5W

freq ue n c y (Hz)

Figure5:

THD(%)

10

1

0.1

0.010

Figure7:

Leve l(dBr)

5.0000

4.0000

3.0000

2.0000

1.0000

0.0

-1.000

-2.000

-3.000

-4.000

-5.000

Distortionvs Output Power

Vcc = 12 V
Rl = 8 ohm

f=15KHz

f=5KHz

f=1KHz

0.1 1 10

Pout (W)

FrequencyRespone

Vcc = 16.5V
Rl = 8 ohm
Pou t = 1W

10 100 1k 10k 100 k

frequency(Hz)

Figure 8: OutputPower vs Supply Voltage

)

Po(W

20.000

18.000

16.000

14.000

12.000

10.000

8.00 00

6.00 00

4.00 00

2.00 00

0.0

6.000 7.000 8.000 9.0 00 10. 00 11.00 12. 00 13.00 14. 00 15 . 00 16. 00 17. 00 18.00

6/9

Rl = 8 ohm
f = 1KHz

d=10%

d=1%

Vs(V)

Figure9: Total Power Dissipation& Efficiencyvs

OutputPower

Ptot(W)

16
14
12

Ptot

µ

10

8
6
4

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

2
0

012345678910111213141516

2XPout(W)

µ(%)

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

TDA7297

Figure 10:

Attenuation (dB)

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

1 1.5 2 2.5 3 3.5 4 4.5 5

MuteAttenuationvs. V pin.6

Vpin.6(V)

Figure 12:

QuiscentCurrent vs. SupplyVoltage

Iq(mA)

70
65
60
55
50
45
40
35
30

6789101112131415161718

Vsupply(V)

Figure11:

Attenuation (dB)

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

Stand-ByAttenuation vs Vpin.7

Vpin.7(V)

7/9

TDA7297

MULTIWATT15 PACKAGE MECHANICAL DATA

DIM.

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

MIN. TYP. MAX. MIN. TYP. MAX.

mm inch

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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 arenotauthorized for useas criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.

 1997 SGS-THOMSON Microelectronics – Printed in Italy – AllRights Reserved

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