ST MICROELECTRONICS TDA 7297 Datasheet

®

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.

BLOCK AND APPLICATION DIAGRAM

0.22µF

IN1

ST-BY 7

4

TECHNOLOGY BI20II

Multiwatt 15

ORDERING NUMBER:

V

CC

133

+

-

1

470µF 100nF

OUT1+

TDA7297

IN2

MUTE 6

September 2003

0.22µF

S-GND

PW-GND

9

12

8

Vref

OUT1-

15

14

2

OUT2+

OUT2-

D94AU175B

1/9

-

+

-

+

TDA7297

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I P T

T

stg

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 °C

op

= 70°C) 33 W

case

, TjStorage and Junction Temperature -40 to +150 °C

Thermal Resistance Junction to case Typ. 1.4 Max. 2 °C/W

PIN CONNECTION

ELECTRICAL CHARACTERISTICS

(Top view)

15 14 13 12 11 10

9 8 7 6 5 4 3 2 1

= 16.5V, RL = 8Ω, f = 1kHz, T

(V

CC

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

1%

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 KΩ

i

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TDA7297

ELECTRICAL CHARACTERISTICS

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 µA Total Output Noise Voltage A curve

APPLICATION SUGGES TION

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 (f rom mP) goes high and the voltage across the St-by terminal (Pin 7) starts t o increase exponentially. The external RC network is intended to turn-on slowly the biasing circuits of

Figure 1:

Microprocessor Application

(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-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.

V

CC

µV µV

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+

OUT1-

2

OUT2+

OUT2-

+

-

+

-

+

C5

470µF

D95AU258A

C6

100nF

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TDA7297

Figure 2:

Microprocessor Driving 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 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

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.

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TDA7297

Figure 3:

Stand-alone Low-cost Application.

R1

47K

R2

47K

C3 0.22µF

IN1

ST-BY

C4

10µF

S-GND

C5 0.22µF

IN2

MUTE

4

7

9

12

6

Vref

V

CC

133

+

-

+

-

1

2

15

C1

470µFC2100nF

OUT1+

OUT1-

OUT2+

Figure 3b:

PW-GND

-

8

+

14

PCB and Component Layout of the Application Circuit (Fig. 1).

OUT2-

D95AU260A

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)

TDA7297

Figure 4:

THD(%)

0.010

Figure 6:

THD(%)

10

0.1

0.010

Distortion vs Output Power

10

Vcc = 16.5V

1

0.1

0.1 1 10 20

Rl = 8 ohm

f = 15KH z

f = 5KHz

f = 1KHz

Pout (W)

Distortion vs Frequency

Vcc = 16.5V

1

100 1k 10k 20k

Rl = 8 ohm

Pout = 100mW

Pout = 5W

freq ue n c y (H z)

Figure 5:

THD(%)

10

0.1

0.010

Figure 7:

Level(dBr)

5.0000

4.0000

3.0000

2.0000

1.0000

0.0

-1.000

-2.000

-3.000

-4.000

-5.000

Distortion vs Output Power

Vcc = 12 V Rl = 8 ohm

1

f = 15KHz

f = 5KHz

f = 1KHz

0.1 1 10

Pout (W)

Frequency Respone

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

10 100 1k 10k 100k

frequency (Hz)

Figure 8:

Output Power vs Supply Voltage

Figure 9:

Total Power Dissipation & Efficiency vs

Output Power

Po(W

20.000

18.000

16.000

14.000

12.000

10.000

8.0000

6.0000

4.0000

2.0000

0.0

6.000 7.000 8.000 9.000 10.00 11.00 12.00 13.00 14.00 15 .00 16.00 17.00 18.00

Rl = 8 ohm f = 1KHz

d = 10%

d = 1%

Vs(V)

Ptot(W)

16 14 12

P tot

µ

10

8 6 4

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

2 0

012345678910111213141516

2XPout(W)

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µ(%)

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

TDA7297

Figure 10:

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

11.522.533.544.55

Mute Attenuation vs. V pin.6

Attenuation (dB)

Vpin.6( V)

Figure 12:

Quiscent Current vs. Supply Voltage

Iq (m A)

70 65 60 55 50 45 40 35 30

6789101112131415161718

Vsupply(V)

Figure 11:

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-By Attenuation vs Vpin.7

Vp in .7 (V )

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TDA7297

DIM.

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

A 5 0 .197 B 2.65 0.104 C 1.6 0.063 D 1 0.03 9 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 1 7.78 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 0.68 9 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

mm inch

OUTLINE AND

MECHANICAL DATA

Multiwatt15 V

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TDA7297

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