Datasheet TDA7297SA Datasheet (ST)

TDA7297SA

10W+10W DUAL BRIDGE AMPLIFIER

■ WIDE SUPPLY VOLTAGE RA NGE (6 V- 1 8 V)

■ 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 TDA7297SA is a dual bridge amplifier specially
designed for TV and Portable Radio applications.

BLOCK AND APPLICATION DIAGRAM

0.22µF

IN1

ST-BY 7

4

TECHNOLOGY BI20II

CLIPWATT15

ORDERING NUMBER: TDA7297SA

Pin to pin compatible with: TDA7297, TDA7266B,
TDA7266SA, TDA7266M, TDA7266MA, TDA7266,
& TDA7266S.

V

CC

133

+

-

1

470µF 100nF

OUT1+

IN2

MUTE 6

September 2003

0.22µF

S-GND

PW-GND

9

12

8

Vref

OUT1-

15

14

2

OUT2+

OUT2-

D94AU175B

1/11

-

+

+

-

-

+

TDA7297SA

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

O

Ptot Total power dissipation (T

T

op

T

stg, Tj

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

Supply Voltage 20 V

s

Output Peak Current (internally limited) 2 A

= 70°C) 30 W

case

Operating Temperature 0 to 70 °C
Storage and Junction Temperature -40 to 150 °C

Thermal Resistance Junction-case Typ. = 1.8; Max. = 2.5 °C/W
Thermal Resistance Junction to ambient 48 °C/W

PIN CONNECTION

ELECTRICAL CHARACTERISTCS

(V

= 13V, RL = 8Ω, f = 1KHz, T

CC

(Top view)

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

D03AU1463

= 25°C unless otherwise specified)

amb

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

CC

OUT1­OUT1+

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

V

P

THD Total Harmonic Distortion P

Supply Range 6.5 18 V

CC

Total Quiescent Current RL = ∞ 50 65 mA

I

q

Output Offset Voltage 120 mV

OS

Output Power THD 10% 8.3 10 W

O

= 1W 0.1 0.3 %

O

= 0.1W to 2W

P

O

1%

f = 100Hz to 15KHz

SVR Supply Voltage Rejection f = 100Hz, V

=0.5V 40 56 dB

R

CT Crosstalk 46 60 dB

A

MUTE

∆G

T

G

Mute Attenuation 60 80 dB
Thermal Threshold 150 °C

w

Closed Loop Voltage Gain 31 32 33 dB

V

Voltage Gain Matching 0.5 dB

V

2/11

TDA7297SA

ELECTRICAL CHARACTERISTCS

(V

= 13V, RL = 8Ω, f = 1KHz, T

CC

(continued)

= 25°C unless otherwise specified)

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

R

Input Resistance 25 30 KΩ

i

VT
VT

I

MUTE
ST-BY

ST-BY

e

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 µA
Total Output Voltage A Curve;

N

f = 20Hz to 20KHz

150
220 500

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 St­by 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

µ

P) 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.

Figure 1. Microprocessor Application

C1 0.22µF

IN1

R1 10K

ST-BY

C2

10µF

µP

IN2

MUTE

S-GND

C3 0.22µF

R2 10K

C4

1µF

PW-GND

V

CC

4

7

9

Vref

12

6

8

+

-

-

+

+

-

-

+

133

1

2

15

14

C5

470µFC6100nF

OUT1+

OUT1-

OUT2+

OUT2-

D95AU258A

3/11

TDA7297SA

d

Figure 2. Microprocessor Dri ving Sig nals

+VS(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 ST-BY

MUTE

OFF

D96AU259/mo

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 l ine via an external v oltage

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

Figure 3. Stand-alone low-cost Application

f = 5K Hz

TDA7297SA

V

CC

R1

47K

R2

47K

C4

10µF

IN1

C3 0.22µF

C5 0.22µF

IN2

PW-GND

ST-BY

S-GND

MUTE

4

7

9

12

6

8

Vref

133

+

1

470µFC2100nF

OUT1+

-

C1

OUT1-

-

2

+

+

15

OUT2+

-

-

14

OUT2-

+

D95AU260A

Figure 4. Disto rti on v s Output Pow er. Figure 5. Disto rti on v s Frequency

THD(%)

10

Vcc = 12 V
Rl = 8 ohm

1

f = 15KHz

0.1

f = 1K Hz

0.010

0.1 1 10

Pout (W)

THD(%)

10

Vcc = 16.5V

1

0.1

0.010
100 1k 10k 20k

Rl = 8 ohm

Pout = 100mW

Pout = 5W

freq ue n cy (H z )

5/11

TDA7297SA

Figure 6. Fre quency Resp onse

Level(dBr)

5.0000

4.0000

3.0000

2.0000

1.0000

0.0

-1.000

-2.000

-3.000

-4.000

-5.000
10 100 1k 10 k 100k

Vcc = 16.5V
Rl = 8 ohm
Pout = 1W

frequency (Hz)

Figure 7. Out put P ower vs Supply V ol ta ge

Po

(W)

10

Rf=8Ω
f=1KHz

8

6

d=10%

4

2

0

6

7 8 9 10 11 12 Vs(V)

D99AU1080

d=1%

Figure 9. Mute Attenuation vs Vpin 6

Attenuation (dB)

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

11.522.533.544.55

Vpin.6(V)

Figure 10. Stand-By attenuation vs Vpin 7

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

Vp in .7 (V )

Figure 8. Ptot & Efficiency vs Ouput Power

Ptot(W)

10

8

6

4

2

0

00.51234567891011

6/11

Ptot

2 x Pout (W )

µ

Vcc = 12V

= 8Ω(both

R

L

channel)
f = 1KHz

Figure 11. Quiescent Current vs Supply

Voltage

µ (%)

80

60

40

20

0

Iq (mA)

70
65
60
55
50
45
40
35
30

6789101112131415161718

Vsupply(V)

Figure 12. PC Board Component Layout

Figure 13. Evaluation Board Top Layer Layout

TDA7297SA

Figure 14. Evaluation Board Bottom Layer Layout

7/11

TDA7297SA

HEAT SINK DIMENSIONING:

In order to avoid the thermal protection intervention, that is placed approximati vely at Tj = 150°C, it is important
the dimensioning of the Heat Sinker R

The parameters that influence the dimensioning are:
– Maximum dissipated powe r for the device (P
– Max thermal resistance Junction to case (R

– Max. ambient temperature T

amb max

– Quiescent current Iq (mA)

Example:

= 13V, R

V

CC

= (N° channels) ·

P

dmax

= 2 · ( 4.28 ) + 0.5 = 9 W

P

dmax

(Heat Sinker)

= 8ohm, R

load

R

Th c-a

= 2.5 °C/W , T

Th j-c

2

V

cc

-------------------------- - I
R

2

load

--------------

⋅

Π

2

150 T

–

----------------------------------------- R

P

d max

Th

qVcc

amb max

(°C/W).

⋅+

–

Th j-c

dmax

)

Th j-c

amb max

)

= 50°C

150 50–

---------------------- 2.5– 8.6°C/W===
9

In figure 15 is shown the Power derating curve for the device.

Figure 15. Power derating curve

35

35

30

30

25

25

20

20

(c)

Pd (W)

Pd (W)

15

15

10

10

5

5

0

0

0 40 80 120 160

0 40 80 120 160

(c)

(d)

(d)

(b)

(b)

Tamb (°C)

Tamb (°C)

(a)

(a)

a) Infinite Heatsink

a) Infinite Heatsink
b) 3.5 °C/ W

b) 3.5 °C/ W
c) 5.0 °C/ W

c) 5.0 °C/ W
d) 7.0 °C/ W

d) 7.0 °C/ W

8/11

TDA7297SA

Clipwatt Assembling Suggestions

The suggested mounting method of Clipwatt on external heat sink, requires the use of a clip placed as much
as possible in the plastic body center, as indicated in the example of figure 16.

A thermal grease can be used in order to reduce the additio nal thermal resistance of the contact betw een pack­age and heatsink.

A pressing force of 7 - 10 Kg gives a good contact and the clip mus t be designed in order to avoid a maxi mum
contact pressure of 15 Kg/mm2 between it and the plastic body case.

As example , if a 15Kg force is applied by the clip on the package , the clip must have a contact area of 1mm2
at least.

Figure 16. Example of right placement of the clip

9/11

TDA7297SA

DIM.

mm inch

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

A 3.2 0.126
B 1.05 0.041
C 0.15 0.006
D 1.55 0.061
E 0.49 0.55 0.019 0.022
F 0.67 0.73 0.026 0.029

G 1.14 1.27 1.4 0.045 0.050 0.055
G1 17.57 17.78 17.91 0.692 0.700 0.705
H1 12 0.480
H2 18.6 0.732
H3 19.85 0.781

L 17.95 0.707
L1 14.45 0.569
L2 10.7 11 11.2 0.421 0.433 0.441
L3 5.5 0.217

M 2.54 0.100

M1 2.54 0.100

OUTLINE AN D

MECHAN ICAL DATA

Weight:

1.92gr

Clipwatt15

10/11

0044538

TDA7297SA

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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
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11/11