SGS Thomson Microelectronics TDA7266M Datasheet

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TDA7266M

7W MONO BRIDGEAMPLIFIER

WIDESUPPLYVOLTAGERANGE(3-18V)
MINIMUMEXTERNALCOMPONENTS

– NOSWR CAPACITOR
– NOBOOTSTRAP
– NOBOUCHEROT CELLS
– INTERNALLYFIXED GAIN

STAND-BY & MUTEFUNCTIONS
SHORTCIRCUITPROTECTION
THERMALOVERLOADPROTECTION

DESCRIPTION

The TDA7266M is a mono bridge amplifier spe­cially designed for TV and Portable Radio appli­cations.

BLOCK AND APPLICATIONDIAGRAM

TECHNOLOGY BI20II

Multiwatt 15

ORDERING NUMBER: TDA7266M

V

CC

0.22µF

IN1

ST-BY 7

S-GND

MUTE 6 8

August 1998

4

9

+

-

-

Vref

+

133

1

2

470µF 100nF

OUT1+

OUT1-

PW-GND

D98AU831A

1/9

TDA7266M

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 °C

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

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

D98AU832

N.C.
N.C.
VCC
N.C.
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

A

MUTE

T

W

G

V

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

f = 100Hz to 15kHz

Mute Attenuation 60 80 dB
Thermal Threshold 150
Closed LoopVoltage 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

V

CC

-0.75

/2

1%

4.1

V

/2

CC

-0.5

C

°

V
V

2/9

TDA7266M

ELECTRICALCHARACTERISTICS

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

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 function using 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) startsto
increase exponentially. The external RC network
is intended to turn-onslowly the biasing circuits of

(Continued)

150

f = 20Hz to 20kHz

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

µ

µP

IN1

ST-BY

MUTE

C1 0.22µF

R1 10K

C2

10µF

R2 10K

C4

1µF

S-GND

V

CC

4

7

9

Vref

68

+

-

-

+

133

1

OUT1+

2

OUT1-

PW-GND

C5

470µF

D98AU833A

C6

100nF

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