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Multiwatt15
Features
• Wide supply voltage range (3 - 18 V)
• Minimum external components
– No SWR capacitor
– No bootstrap
– No boucherot cells
– Internally fixed gain
• Standby and mute functions
• Short-circuit protection
• Thermal overload protection
Description
The TDA7266 is a dual bridge amplifier specially designed for TV and portable radio
applications.
Maturity status link
TDA7266
Order code
TDA7266
7 + 7 W dual bridge amplifier
TDA7266
Datasheet
DS0184 - Rev 11 - June 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
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1 Block diagram
Figure 1. Block and application diagram
1
2
4
Vref
ST-BY 7
IN1
0.22μF
VCC
3 13
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE 6
IN2
0.22μF
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
470μF 100nF
TDA7266
Block diagram
DS0184 - Rev 11 page 2/17
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2 Maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
VS Supply voltage 20 V
IO Output peak current (internally limited) 2 A
Ptot Total power dissipation (Tcase= 70 °C) 33 W
Top Operating temperature -10 to +85 °C
Tstg Storage temperature
-40 to +150 °C
Tj Junction temperature
Table 2. Thermal data
Symbol Parameter Typ. Max. Unit
Rth-jcase Thermal resistance junction-case 1.4 2 °C/W
TDA7266
Maximum ratings
DS0184 - Rev 11 page 3/17
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3 Pin connection
Figure 2. Pin connection (top view)
1
2
3
4
5
6
7
9
10
11
8
N.C.
N.C.
S-GND
PW-GND
ST-BY
MUTE
N.C.
IN1
VCC
OUT1-
OUT1+
13
14
15
12
OUT2+
OUT2-
VCC
IN2
TDA7266
Pin connection
DS0184 - Rev 11 page 4/17
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4 Electrical characteristics
VCC = 11 V, RL = 8 Ω, f = 1 kHz, Tamb = 25 °C unless otherwise specified.
Table 3. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
VCC Supply range 3 11 18 V
Iq Total quiescent current 50 65 mA
VOS Output offset voltage 120 mV
PO Output power THD = 10% 6.3 7 W
THD Total harmonic distortion
PO = 1 W 0.05 0.2
PO = 1 W to 2 W %
f = 100 Hz to 15 kHz
1
SVR Supply voltage rejection f = 100 Hz, VR = 0.5 V 40 56 dB
CT Crosstalk 46 60 dB
AMUTE Mute attenuation
TW Thermal threshold
GV Closed loop voltage gain 25 26 27
dB
∆GV Voltage gain matching 0.5
RI Input resistance 25 30 kΩ
VTMUTE Mute threshold
for VCC > 6.4 V; VO = -30 dB 2.3 2.9 4.1
V
for VCC < 6.4 V; VO = -30 dB VCC/2-1 VCC/2-0.75 VCC/2-0.5
VTST-BY ST-BY threshold 0.8 1.3 1.8 V
IST-BY ST-BY current V6 = GND 100 μA
eN Total output noise voltage
A curve
f = 20 Hz to 20 kHz
150 μV
TDA7266
Electrical characteristics
DS0184 - Rev 11 page 5/17
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5 Application suggestion
Standby and mute functions
(A) Microprocessor application
Turn-on/off transients, guarantee the right ST-BY and mute signal sequence.
This function can be got thanks to a microprocessor (Figure 3. Microprocessor application and
Figure 4. Microprocessor driving signals).
At first ST-BY signal (from microprocessor) goes high and the voltage across the ST-BY terminal (Pin 7) starts to
increase exponentially. The external RC network turns on slowly the biasing circuits of the amplifier, 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.
The mute signal must be kept low until the capacitors are fully charged, so to avoid that the device goes to play
mode causing a loud "Pop Noise" on the speakers.
A delay of 100 - 200 ms between ST-BY and mute signals is suitable for a proper operation.
Figure 3. Microprocessor application
1
2
4
Vref
ST-BY
7
IN1
C1 0.22μF
VCC
3 13
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C3 0.22μF
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C5
470μF
C6
100nF
R1 10K
C2
10μF
μP
R2 10K
C4
1μF
TDA7266
Application suggestion
DS0184 - Rev 11 page 6/17
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Figure 4. Microprocessor driving signals
+VS(V)
VIN
(mV)
VST-BY
pin 7
I
q
(mA)
ST-BY
MUTE
PLAY MUTE ST-BY
+18
1.8
0.8
VMUTE
pin 6
4.1
2.3
OFF
OFF
VOUT
(V)
2.9
1.3
(B) Low cost application
In low cost applications where the microprocessor is not present, the suggested circuit is shown in
Figure 5. Stand-alone low-cost application.
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.
TDA7266
Application suggestion
DS0184 - Rev 11 page 7/17
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Figure 5. Stand-alone low-cost application
1
2
4
Vref
ST-BY
7
IN1
C3 0.22μF
VCC
3 13
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C5 0.22μF
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C1
470μF
C2
100nF
R1
47K
C4
10μF
R2
47K
VCC
Figure 6. PCB and component layout of the application circuit (Fig. 1)
TDA7266
Application suggestion
DS0184 - Rev 11 page 8/17
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6 Typical characteristics
Figure 7. Distortion vs. output power (VCC = 11 V)
0.01 0
0.1
1
10
0.1 1 10
Vcc = 11 V
Rl = 8 oh m
f = 15 KH z
f = 5 KH z
f = 1 KH z
Pout (W )
THD (%)
Figure 8. Distortion vs. output power (VCC = 9 V)
0.010
0.1
1
10
0.1 1 10
THD (% )
Vcc = 9V
Rl= 8 oh m
f = 15KH z
f = 5 K Hz
f = 1KH z
Pou t (W )
Figure 9. Distortion vs. frequency
0.010
0.1
1
10
100 1k 10k 20k
THD (%)
Vcc = 11 V
Rl = 8 ohm
Pout = 10 0mW
Pout = 2W
frequency (Hz)
Figure 10. Gain vs. frequency
-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
Level(dBr)
Vcc = 11V
Rl = 8 ohm
Pout = 1W
frequency (Hz)
TDA7266
Typical characteristics
DS0184 - Rev 11 page 9/17
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Figure 11. Output power vs. supply voltage
0.0
2.000 0
4.000 0
6.000 0
8.000 0
10.00 0
12.00 0
14.00 0
16.00 0
18.00 0
20.00 0
2.00 0 4.00 0 6.00 0 8.00 0 10.00 12.00 14.00 16.00 18.00
Po (W)
Vs (V)
d = 10 %
d = 1%
R l = 8 ohm
f = 1KH z
Figure 12. Total power dissipation & efficiency vs. output
power
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
0
1
2
3
4
5
6
7
8
0
10
20
30
40
50
60
70
80
Ptot (W) μ (%)
2 X Pout (W)
Vcc = 11V
Rl = 8ohm (both channels)
f = 1KHz
Ptot
μ
Figure 13. Mute attenuation vs. Vpin. 6
1 1.5 2 2.5 3 3.5 4 4.5 5
0
10
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Attenuation (dB)
Vpin.6 (V)
Figure 14. Standby attenuation vs. Vpin. 7
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
0
10
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
Attenuation (dB)
Vpin.7 (V)
TDA7266
Typical characteristics
DS0184 - Rev 11 page 10/17
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Figure 15. Quiescent current vs. supply voltage
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
30
35
40
45
50
55
60
65
70
Iq (mA)
Vsupply (V)
TDA7266
Typical characteristics
DS0184 - Rev 11 page 11/17
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7 Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages,
depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product
status are available at: www.st.com. ECOPACK is an ST trademark.
TDA7266
Package information
DS0184 - Rev 11 page 12/17
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7.1 Multiwatt15 V package information
Figure 16. Multiwatt15 V package outline
Table 4. Multiwatt15 V package mechanical data
Symbol
Milimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 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 20.2 0.795
L 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 0.713
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 0.114
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
TDA7266
Multiwatt15 V package information
DS0184 - Rev 11 page 13/17
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Symbol
Milimeters Inches
Min. Typ. Max. Min. Typ. Max.
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152
TDA7266
Multiwatt15 V package information
DS0184 - Rev 11 page 14/17
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Revision history
Table 5. Document revision history
Date Version Changes
24-Mar-2002 10 No history because of migration.
18-Jun-2019 11 Updated operating temperature value in Table 1. Absolute maximum ratings.
TDA7266
DS0184 - Rev 11 page 15/17
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Contents
1 Block diagram .....................................................................2
2 Maximum ratings ..................................................................3
3 Pin connection ....................................................................4
4 Electrical characteristics...........................................................5
5 Application suggestion ............................................................6
6 Typical characteristics .............................................................9
7 Package information..............................................................12
7.1 Multiwatt15 leads package information ........................................... 13
Revision history .......................................................................15
TDA7266
Contents
DS0184 - Rev 11 page 16/17
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IMPORTANT NOTICE – PLEASE READ CAREFULLY
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2019 STMicroelectronics – All rights reserved
TDA7266
DS0184 - Rev 11 page 17/17