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TDA7266SA
September 2003
s
WIDE SUPPLY VOLTAGE RANGE (3.5-18V)
s
MINIMUM EXTERNAL COMPONENTS
NO SWR CAPACITOR
NO BOOTSTRAP
NO BOUCHEROT CELLS
INTERNALLY FIXED GAIN
s
STAND-BY & MUTE FUNCTIONS
s
SHORT CIRCUIT PROTECTION
s
THERMAL OVERLOAD PROTECTION
DESCRIPTION
The TDA7266SA is a dual bridge amplifier specially
designed for LCD Monitor, PC Motherboard, TV and
Portable Radio applications.
Pin to pin compatible with: TDA7266S, TDA7266,
TDA7266M, TDA7266MA, TDA7266B, TDA7297SA
& TDA7297.
CLIPWATT15
ORDERING NUMBER: TDA7266SA
7W+7W DUAL BRIDGE AMPLIFIER
BLOCK AND APPLICATION DIAGRAM
1
2
4
Vref
ST-BY
7
IN1
0.22
F
VCC
13
3
D94AU175B
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
0.22
F
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
470
F
100nF
TECHNOLOGY BI20II
TDA7266SA
2/11
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION (Top view)
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
amb
= 70C)
20
W
T
op
Operating Temperature
0 to 70
C
T
stg,
T
j
Storage and Junction Temperature
-40 to 150
C
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction-case
Typ = 1.8; Max. = 2.5
C/W
R
th j-amb
Thermal Resistance Junction-ambient
48
C/W
ELECTRICAL CHARACTERISTCS
(V
CC
= 11V, R
L
= 8
, f = 1KHz, T
amb
= 25C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
CC
Supply Range
3
11
18
V
I
q
Total Quiescent Current
50
65
mA
V
OS
Output Offset Voltage
120
mV
P
O
Output Power
THD 10%
6.3
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
56
dB
CT
Crosstalk
46
60
dB
A
MUTE
Mute Attenuation
60
80
dB
T
w
Thermal Threshold
150
C
G
V
Closed Loop Voltage Gain
25
26
27
dB
G
V
Voltage Gain Matching
0.5
dB
1
2
3
4
5
6
7
9
10
11
8
N.C.
N.C.
S-GND
PW-GND
OUT2+
OUT2-
VCC
IN2
ST-BY
MUTE
N.C.
IN1
VCC
OUT1-
OUT1+
D03AU1463
13
14
15
12
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TDA7266SA
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 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
P) goes high and the voltage across the St-by terminal (Pin 7) starts to increase ex-
ponentially. 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, C53) 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.
Figure 1. Microprocessor Application
R
i
Input Resistance
25
30
K
VT
MUTE
Mute Threshold
for V
CC
> 6.4V; Vo = -30dB
2.3
2.9
4.1
V
for V
CC
< 6.4V; Vo = -30dB
V
CC
/2
-1
V
CC
/2
-075
V
CC
/2
-0.5
V
VT
ST-BY
St-by Threshold
0.8
1.3
1.8
V
I
ST-BY
St-by Current V6 = GND
100
A
e
N
Total Output Voltage
A Curve; f = 20Hzto 20KHz
150
V
ELECTRICAL CHARACTERISTCS (continued)
(V
CC
= 11V, R
L
= 8
, f = 1KHz, T
amb
= 25C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
1
2
4
Vref
ST-BY
7
IN1
C1 0.22
F
VCC
13
3
D95AU258A
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C3 0.22
F
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C5
470
F
C6
100nF
R1 10K
C2
10
F
P
R2 10K
C4
1
F
TDA7266SA
4/11
Figure 2. Microprocessor Driving Signals
B) Low Cost Application
In low cost applications where the
P 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 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
1.8
0.8
V
MUTE
pin 6
4.1
2.3
OFF
OFF
D96AU259mod
V
OUT
(V)
2.9
1.3
5/11
TDA7266SA
Figure 3. Stand-alone low-cost Application
1
2
4
Vref
ST-BY
7
IN1
C3 0.22
F
VCC
13
3
D95AU260A
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C5 0.22
F
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C1
470
F
C2
100nF
R1
47K
C4
10
F
R2
47K
Figure 4. Distortion vs Frequency
Figure 5. Gain vs Frequency
0.0 10
0.1
1
10
100
1k
10k
20k
THD(%)
V cc = 11 V
R l = 8 o h m
P o u t = 100 m W
P o u t = 2W
fr eq ue nc y (Hz)
-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
Le vel(dB r)
Vcc = 11V
Rl = 8 o h m
Po u t = 1W
fr eq uenc y (Hz)
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