SGS Thomson Microelectronics TDA7266S Datasheet

TDA7266S

5+5W DUAL BRIDGE AMPLIFIER

PRODUCT PREVIEW

WIDESUPPLYVOLTAGERANGE(3-18V)
MINIMUMEXTERNALCOMPONENTS

– NO SWR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROTCELLS
– INTERNALLYFIXEDGAIN

STAND-BY & MUTE FUNCTIONS
SHORTCIRCUITPROTECTION
THERMALOVERLOADPROTECTION

DESCRIPTION

The TDA7266Sis a dual bridge amplifier specially
designed for TVand PortableRadioapplications.

BLOCK AND APPLICATION DIAGRAM

0.22µF

IN1

ST-BY 7

4

TECHNOLOGY BI20II

Multiwatt 15

ORDERING NUMBER: TDA7266S

V

CC

133

+

-

1

470µF 100nF

OUT1+

S-GND

0.22µF

IN2

MUTE 6

PW-GND

February 1998

This is preliminary information on a new productnowin development. Details are subject to change withoutnotice.

9

12

8

Vref

15

14

2

OUT1-

OUT2+

OUT2-

D94AU175B

-

+

+

-

-

+

1/8

TDA7266S

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) 1.5 A

O

Total Power Dissipation (T

tot

Operating Temperature 0 to 70 °C

op

=70°C) 25 W

case

Storage and Junction Temperature -40to +150 °C

Thermal Resistance Junction to case Typ. 1.6 Max. 2.2 °C/W

PIN CONNECTION

ELECTRICAL CHARACTERISTICS (VCC= 11V, RL=8Ω, f = 1kHz, T

(Top view)

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

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 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 60 mA
Output Offset Voltage 120 mV
Output Power THD = 10% 4.5 5 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 °C
Closed Loop Voltage Gain 25 26 27 dB

Input Resistance 25 30 K

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

1%

4.1

VCC/2

-0.5

Ω

V
V

2/8

TDA7266S

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 NoiseVoltage 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 signalssequence.
It is quite simple to obtain this function using a mi­croprocessor(Fig. 1 and2).

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

(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-on and 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

CC

V

µ

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+

2

OUT1-

OUT2+

OUT2-

+

-

-

+

+

-

-

+

C5

470µF

D95AU258A

C6

100nF

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