TDA7266M
®
7W MONO 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
TECHNOLOGY BI20II
Multiwatt 15
ORDERING NUMBER: TDA7266M
DESCRIPTION
The TDA7266M is a mono bridge amplifier specially designed for TV and Portable Radio applications.
BLOCK AND APPLICATION DIAGRAM
VCC
470µF
3
0.22µF
4
VCC
+
100nF
13
1
OUT1+
2
OUT1-
ST-BY
7
S-GND
MUTE
9
6
Vref
+
8
PW-GND
D98AU831A
July 2002
1/9
TDA7266M
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VS
IO
Supply Voltage
Output Peak Current (internally limited)
Ptot
Total Power Dissipation (Tcase = 70°C)
Top
Operating Temperature
Tstg, Tj
Storage and Junction Temperature
Value
Unit
20
2
V
A
33
W
0 to 70
°C
-40 to +150
°C
Value
Unit
THERMAL DATA
Symbol
Rth j-case
Description
Thermal Resistance Junction to case
Typ. 1.4
Max. 2
°C/W
PIN CONNECTION (Top view)
15
N.C.
14
N.C.
13
VCC
12
N.C.
11
N.C.
10
N.C.
9
S-GND
8
PW-GND
7
ST-BY
6
MUTE
5
N.C.
4
IN1
3
VCC
2
OUT1-
1
OUT1+
D98AU832
ELECTRICAL CHARACTERISTICS (VCC = 11V, RL = 8Ω, f = 1kHz, Tamb = 25°C unless otherwise
specified.)
Symbol
VCC
Iq
VOS
PO
THD
Parameter
Supply Range
Total Quiescent Current
Output Offset Voltage
Output Power
Total Harmonic Distortion
SVR
AMUTE
TW
GV
Ri
VTMUTE
Supply Voltage Rejection
Mute Attenuation
Thermal Threshold
Closed Loop Voltage Gain
Input Resistance
Mute Threshold
2/9
Test Condition
THD = 10%
PO = 1W
PO = 0.1W to 2W
f = 100Hz to 15kHz
f = 100Hz VR = 0.5V
for VCC > 6.4V; VO = -30dB
for VCC < 6.4V; VO = -30dB
Min.
3
Typ.
11
50
6.3
7
0.05
40
60
25
25
2.3
VCC/2
-1
56
80
150
26
30
2.9
VCC/2
-0.75
Max.
18
65
120
0.2
1
27
4.1
VCC/2
-0.5
Unit
V
mA
mV
W
%
%
dB
dB
°C
dB
KΩ
V
V
TDA7266M
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
VTST-BY
IST-BY
eN
Parameter
St-by Threshold
ST-BY current V6 = GND
Total Output Noise Voltage
Test Condition
Min.
0.8
A curve
f = 20Hz to 20kHz
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 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
Typ.
1.3
Max.
1.8
100
150
Unit
V
µA
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.
Figure 1: Microprocessor Application
VCC
C1 0.22µF
IN1
3
4
+
1
C5
470µF
OUT1+
2
OUT1-
13
C6
100nF
-
ST-BY R1 10K
7
C2
10µF
S-GND
µP
9
Vref
MUTE R2 10K
C4
1µF
6
+
8
PW-GND
D98AU833A
3/9
TDA7266M
Figure 2: Microprocessor Driving Signals.
+VS(V)
+18
VIN
(mV)
VST-BY
pin 7
1.8
1.3
0.8
VMUTE
pin 6
4.1
2.9
2.3
Iq
(mA)
VOUT
(V)
OFF
ST-BY
PLAY
MUTE
(B) Low Cost Application
In low cost applications where the mP 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
4/9
MUTE
ST-BY
OFF
D96AU259
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.
TDA7266M
Figure 3a: Stand-alone Low-cost Application.
VCC
Vs
C3 0.22µF
R1
47K
4
1
C1
470µF
OUT1+
2
OUT1-
13
+
IN1
ST-BY
R2
47K
3
C2
100nF
7
C4
10µF
S-GND
9
Vref
MUTE
+
6
8
PW-GND
D98AU834B
Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1).
DASHED PARTS
ARE NOT TO BE
CONSIDERED
5/9
TDA7266M
Figure 4: Distortion vs Output Power
Figure 5: Distortion vs Output Power
THD (%)
THD(%)
10
10
Vcc = 11 V
Rl = 8 ohm
Vcc = 9V
Rl= 8 ohm
1
1
f = 15 KHz
f = 15KHz
0.1
0.1
f = 5 KHz
f = 5 KHz
f = 1 KHz
f = 1KHz
0.010
0.1
1
10
0.010
0.1
1
Pout (W)
10
Pout (W)
Figure 6: Distortion vs Frequency
Figure 7: Gain vs Frequency
THD(%)
Level(dBr)
10
5.0000
4.0000
1
Vcc = 11V
Rl = 8 ohm
Pout = 1W
3.0000
Vcc = 11 V
Rl = 8 ohm
2.0000
1.0000
0.0
-1.000
Pout = 100mW
0.1
-2.000
-3.000
Pout = 2W
-4.000
0.010
100
1k
10k
20k
-5.000
10
100
1k
frequency (Hz)
10k
100k
frequency (Hz)
Figure 8: Output Power vs. Supply Voltage
Figure 9: Total Power Dissipation & Efficiency
vs. Output Power
Po(W)
µ(%)
Pd (W)
20.000
4
80
18.000
3.5
Rl = 8 ohm
f = 1KHz
16.000
70
Pd
3
14.000
60
µ
d = 10%
2.5
12.000
2
10.000
d = 1%
8.0000
1.5
6.0000
4.0000
50
Vcc = 11V
Rl = 8ohm
f = 1KHz
40
30
1
20
0.5
10
2.0000
0
0.0
2.000
4.000
6.000
8.000
10.00
Vs(V)
6/9
12.00
14.00
16.00
18.00
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8
Pout(W)
TDA7266M
Figure 10: Mute Attenuation vs. V pin.6
Figure 11: Stand-By Attenuation vs Vpin.7
Attenuation (dB)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1
1.5
2
2.5
3
3.5
4
4.5
5
Vpin.6(V)
Attenuation (dB)
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4
Vpin.7 (V)
Figure 12: Quiescent Current vs. Supply Voltage
Iq (mA)
70
65
60
55
50
45
40
35
30
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18
Vsupply(V)
7/9
TDA7266M
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
D
0.063
1
0.039
E
0.49
0.55
0.019
0.022
F
0.66
0.75
0.026
0.030
G
1.02
1.27
1.52
0.040
0.050
0.060
G1
17.53
17.78
18.03
0.690
0.700
0.710
H1
19.6
0.772
H2
L
20.2
0.795
21.9
22.2
22.5
0.862
0.874
0.886
L1
21.7
22.1
22.5
0.854
0.870
0.886
L2
17.65
18.1
0.695
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
M
4.25
4.55
4.85
0.167
0.179
0.191
M1
4.63
5.08
5.53
0.182
0.200
0.218
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
8/9
OUTLINE AND
MECHANICAL DATA
0.713
0.114
Multiwatt15 V
TDA7266M
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.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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9/9
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