ST MICROELECTRONICS TDA 7266 Datasheet

®

TDA7266

7+7W DUAL BRIDGE AMPLIFIER

WIDE SUPPLY VOLTAGE RANGE (3-18V)
MINIMUM EXTERNAL COMPONENTS

– NO SWR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN

STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION

DESCRIPTION

The TDA7266 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+

TDA7266

March 2002

S-GND

0.22µF

IN2

MUTE 6

PW-GND

9

12

8

Vref

OUT1-

15

14

2

OUT2+

OUT2-

D94AU175B

1/9

-

+

+

-

-

+

TDA7266

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

= 11V, 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+

= 25°C unless otherwise

amb

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 VR = 0.5V 40 56 dB

CT Crosstalk 46 60 dB

A

MUTE

T

W

G

V

∆Gv Voltage Gain Matching 0.5 dB

R

VT

MUTE

Supply Range 3 11 18 V
Total Quiescent Current 50 65 mA
Output Offset Voltage 120 mV
Output Power THD = 10% 6.3 7 W

= 1W 0.05 0.2 %

O

P

= 0.1W to 2W

O

1%

f = 100Hz to 15kHz

Mute Attenuation 60 80 dB
Thermal Threshold 150 °C
Closed Loop Voltage Gain 25 26 27 dB

Input Resistance 25 30 KΩ

i

Mute Threshold for VCC > 6.4V; VO = -30dB

for V

< 6.4V; VO = -30dB

CC

2.3

VCC/2

-1

2.9

VCC/2

-0.75

4.1

VCC/2

-0.5

V
V

2/9

TDA7266

ELECTRICAL CHARACTERISTICS

Symbol Parameter Test Condition Min. Typ. Max. Unit

VT

ST-BY

I

ST-BY

e

N

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 µV

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

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

3/9

TDA7266

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.

4/9

TDA7266

Figure 3a:

Stand-alone Low-cost Application.

V

CC

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

470µFC2100nF

OUT1+

OUT1-

OUT2+

Figure 3b:

PW-GND

-

8

+

14

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

OUT2-

D95AU260A

5/9

0

0

0

0

0

0

0

0

TDA7266

Figure 4:

THD (%)

0.010

Figure 6:

THD(%)

0.010

Distortion vs Output Power

10

Vcc = 11 V
Rl = 8 ohm

1

f = 15 KHz

0.1
f = 5 K H z

f = 1 KHz

0.1 1 10

Pout (W)

Distortion vs Frequency

10

Vcc = 11 V

1

0.1

Rl = 8 ohm

Pout = 100m W

Pout = 2W

100 1k 10k 20k

frequency (Hz)

Figure 5:

THD(%)

0.010

Figure 7:

Level(dBr)

Distortion vs Output Power

10

Vcc = 9V
Rl= 8 ohm

1

f = 15KHz

0.1
f = 5 K Hz

f = 1K H z

0.1 1 10

Pout (W)

Gain vs Frequency

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 10k 100k

Vcc = 11V
Rl = 8 ohm
Pout = 1 W

frequency (Hz)

Figure 8:

Po(W)

20.000

18.000

16.000

14.000

12.000

10.000

8.0000

6.0000

4.0000

2.0000

U

0.0

Output Power vs. Supply Voltage

Rl = 8 ohm
f = 1KHz

2.000 4.000 6.000 8.000 10.00 12.00 14.00 16.00 18.00

Vs(V)

d = 10%

d = 1%

6/9

Figure 9:

Total Power Dissipation & Efficiency

vs. Output Power

Ptot(W )

8
7
6
5
4
3
2
1
0

00.511.522.533.544.555.566.577.58

Ptot

µ

Vcc = 11V
Rl = 8ohm (both channe ls)
f = 1KHz

2 X Pout(W)

µ(%)

8
7
6
5
4
3
2
1
0

TDA7266

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:

Iq (mA)

70
65
60
55
50
45
40
35
30

3456789101112131415161718

Quiescent Current vs. Supply Voltage

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 )

7/9

TDA7266

DIM.

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

mm inch

OUTLINE AND

MECHANICAL DATA

Multiwatt15 V

8/9

TDA7266

Information furnishe d is beli eved to be accu rate and reliable. However, STMicroelec tronics assumes no res ponsibility for the consequences
of use of such i nformation nor for any i nfringement of patents or ot her rights of third par ties which may result from its use. No license i s
granted by impli cation or otherwis e under any patent or patent righ ts of STMicroelect ronics. Specifica tion mentioned in this publication are
subject to change without notic e. This public ation supers edes and replaces all information prev iously supplied. STMic roelec tronic s 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 STMicroelect roni cs

© 2002 STMicroelectronics – Printed in Italy – All Rights Reserved

STMicroelectronics GROUP OF COMPANIES

Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco -

Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.

http://www.st.com

9/9