TDA7266L

5W MONO BRIDGE AMPLIFIER

WIDE SUPPLY VOLTAGE RANGE (3.5V-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 TDA7266L is a mono bridge amplifier spe-
cially designed for TV and Portable Radio appli-
cations.

February 2001

®

10

9

7

Vref

(ST-BY)

ST-BY

4

IN1

5V

S

1

S

2

C

1

0.22

µ

F

C

2

C

4

R

1

R

2

VCC

8

D99AU1039A

+

-

-

+

OUT+

OUT-

MUTE

MUTE

3

5

6

S-GND

PW-GND

C5

470

µ

F

C6

100nF

BLOCK AND APPLICATION DIAGRAM

SIP10

ORDERING NUMBER: TDA7266L

TECHNOLOGY BI20II

1/7

ELECTRICAL CHARACTERISTICS (V

CC

= 11V, 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

3.5

10

18

V

I

q

Total Quiescent Current

35

50

mA

V

OS

Output Offset Voltage

120

mV

P

O

Output Power

THD = 10%

5.5

7

W

THD

Total Harmonic Distortion

P

O

= 1W

0.05

0.2

%

P

O

= 0.1W to 2W

f = 100Hz to 15kHz

1

%

SVR

Supply Voltage Rejection

f = 100Hz VR = 0.5V

40

50

dB

A

MUTE

Mute Attenuation

60

80

dB

T

W

Thermal Threshold

150

°

C

G

V

Closed Loop Voltage Gain

32

dB

R

i

Input Resistance

31

33

K

Ω

VT

MUTE

Mute Threshold

for V

CC

> 6.4V; V

O

= -30dB

for V

CC

< 6.4V; V

O

= -30dB

2.3

V

CC

/2

-1

2.9

V

CC

/2

-0.75

4.1

V

CC

/2

-0.5

V
V

1

2

3

4

5

6

7

8

V

CC

IN

S-GND

PW-GND

ST-BY

MUTE

N.C.

N.C.

9

10

OUT-

OUT+

D99AU1040A

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)

10

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

8

°

C/W

R

th j-amb

Thermal Resistance Junction to ambient

70

°

C/W

TDA7266L

2/7

ELECTRICAL CHARACTERISTICS (Continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

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

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.

(B) Low Cost Application
In low cost applications where the

µ

P 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.

+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 1: Microprocessor Driving Signals.

TDA7266L

3/7

Figure 2: PCB and Component Layout of the Application Diagram

The PC board layout offers compatibility to TDA7266S, TDA7266, TDA7297, (the BTL power amplifiers
in Multiwatt 15 package).

0 .0 1 0

0 .1

1

1 0

0 .1

1

1 0

V cc = 11 V
R l = 8 ohm

f = 1 5 K H z

f = 5 K H z

f = 1 K H z

P ou t (W )

TH D (% )

Figure 3: Distortion vs Output Power

0.0 10

0.1

1

10

0.1

1

10

T H D (% )

V cc = 9V
R l= 8 o h m

f = 1 5K H z

f = 5 K H z

f = 1 K H z

P o u t (W )

Figure 4: Distortion vs Output Power

TDA7266L

4/7

0.0 10

0.1

1

10

100

1k

10k

20k

THD(%)

V cc = 11 V
R l = 8 o hm

P ou t = 100 m W

P ou t = 2W

freque ncy (Hz)

Figure 5: Distortion vs Frequency

-5.000

-4.000

-3.000

-2.000

-1.000

0.0

1.0000

2.0000

3.0000

4.0000

5.0000

10

100

1k

10k

100k

Level(dBr)

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

frequency (Hz)

Figure 6: Gain vs Frequency

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 7: 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 8: Stand-By Attenuation vs Vpin.7

3

4

5

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 9: Quiescent Current vs. Supply Voltage

TDA7266L

5/7

SIP10

DIM.

mm

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

A

7.1

0.280

a1

2.7

3

0.106

0.118

B

24.8

0.976

b1

0.5

0.020

b3

0.85

1.6

0.033

0.063

C

3.3

0.130

c1

0.43

0.017

c2

1.32

0.052

D

23.7

0.933

d1

14.5

0.571

e

2.54

0.100

e3

22.86

0.900

L

3.1

0.122

L1

3

0.118

L2

17.6

0.693

L3

0.25

0.010

L4

0.254

0.010

M

3.2

0.126

N

1

0.039

P

0.15

0.006

D

N

M

L1

1

1

0

d1

L3

L2

La

1

e3

b1

B

e

c

1

A

c2

C

P

L4

SIP10

b3

OUTLINE AND

MECHANICAL DATA

TDA7266L

6/7

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. Specification 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.

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TDA7266L

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