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®
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
-
+
+
-
-
+
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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
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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
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