TDA7266

7+7W DUAL BRIDGE AMPLIFIER

WIDE SUPPLY VOLTAGE RANGE (3-18V)

TECHNOLOGY BI20II
MINIMUM EXTERNAL COMPONENTS
– NO SWR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
STAND-BY & MUTE FUNCTIONS
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION

Multiwatt 15

DESCRIPTION ORDERING NUMBER: TDA7266

The TDA7266 is a dual bridge amplifier specially
designed for TV and Portable Radio applications.

BLOCK AND APPLICATION DIAGRAM

VCC

470µF 100nF
3 13
0.22µF
4
IN1 + 1 OUT1+
-
ST-BY 7

S-GND
9 - 2 OUT1-
Vref
+
0.22µF
12
IN2 + 15 OUT2+
-
MUTE 6

- 14 OUT2-
PW-GND
8 +
D94AU175B

February 1998 1/9

TDA7266

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 0 to 70 °C
Tstg, Tj Storage and Junction Temperature -40 to +150 °C

THERMAL DATA
Symbol Description Value Unit
Rth j-case Thermal Resistance Junction to case Typ. 1.4 Max. 2 °C/W

PIN CONNECTION (Top view)

15 OUT2+
14 OUT2-
13 VCC
12 IN2
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+

D95AU261

ELECTRICAL CHARACTERISTICS (VCC = 11V, RL = 8Ω, f = 1kHz, Tamb = 25°C unless otherwise
specified.)
Symbol Parameter Test Condition 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 = 1W 0.05 0.2 %
PO = 0.1W to 2W 1 %
f = 100Hz to 15kHz
SVR Supply Voltage Rejection f = 100Hz VR = 0.5V 40 56 dB
CT Crosstalk 46 60 dB
AMUTE Mute Attenuation 60 80 dB
TW Thermal Threshold 150 °C
GV Closed Loop Voltage Gain 25 26 27 dB
∆Gv Voltage Gain Matching 0.5 dB
Ri Input Resistance 25 30 KΩ
VTMUTE Mute Threshold for VCC > 6.4V; VO = -30dB 2.3 2.9 4.1 V
for VCC < 6.4V; VO = -30dB VCC/2 VCC/2 VCC/2 V
-1 -0.75 -0.5

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 TDA7266

ELECTRICAL CHARACTERISTICS (Continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit
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 150 µV
f = 20Hz to 20kHz

APPLICATION SUGGESTION the amplifier, this to avoid ”POP” and ”CLICK” on

the outputs.
STAND-BY AND MUTE FUNCTIONS
When this voltage reaches the St-by threshold
(A) Microprocessor Application level, the amplifier is switched-on and the external
In order to avoid annoying ”Pop-Noise” during capacitors in series to the input terminals (C3,
Turn-On/Off transients, it is necessary to guaran- C5) start to charge.
tee the right St-by and mute signals sequence. It’s necessary to mantain the mute signal low until
It is quite simple to obtain this function using a mi- the capacitors are fully charged, this to avoid that
croprocessor (Fig. 1 and 2). the device goes in play mode causing a loud ”Pop
At first St-by signal (from mP) goes high and the Noise” on the speakers.
voltage across the St-by terminal (Pin 7) starts to A delay of 100-200ms between St-by and mute
increase exponentially. The external RC network signals is suitable for a proper operation.
is intended to turn-on slowly the biasing circuits of
Figure 1: Microprocessor Application

VCC

C5 C6
C1 0.22µF 3 13 470µF 100nF
4
IN1 + 1 OUT1+
-
ST-BY R1 10K
7
C2
10µF

S-GND
µP 9
- 2 OUT1-
Vref
+
C3 0.22µF
12
IN2 + 15 OUT2+
-
MUTE R2 10K
6
C4
1µF

- 14 OUT2-
PW-GND
8 +
D95AU258A

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TDA7266

Figure 2: Microprocessor Driving Signals.

+V S(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
PLAY MUTE ST-BY OFF
ST-BY
MUTE D96AU259

(B) Low Cost Application external voltage divider.

In low cost applications where the mP is not pre- The device is switched-on/off from the supply line
sent, the suggested circuit is shown in fig.3. and the external capacitor C4 is intended to delay
the St-by and mute threshold exceeding, avoiding
The St-by and mute terminals are tied together ”Popping” problems.
and they are connected to the supply line via an

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 TDA7266

Figure 3a: Stand-alone Low-cost Application.

VCC

IN1 C1 C2
C3 0.22µF 3 13 470µF 100nF
4
R1 + 1 OUT1+
47K IN1
-
ST-BY
7
R2 C4
47K 10µF

S-GND
9
- 2 OUT1-
Vref
+
C5 0.22µF
12
+ 15 OUT2+
IN2
-

MUTE
6

- 14 OUT2-
PW-GND
8 +
D95AU260

Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1).

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TDA7266

Figure 4: Distortion vs Output Power Figure 5: Distortion vs Output Power

T HD (%)
T H D (% )
10
10

V cc = 11 V
Vc c = 9V
R l = 8 o hm
Rl= 8 o hm
1 1

f = 15 K Hz f = 1 5K H z

0.1 0.1
f = 5 KHz
f = 5 KHz

f = 1 KH z f = 1K H z

0.010 0 .0 10
0.1 1 10 0.1 1 10
Po u t (W ) P o ut (W )

Figure 6: Distortion vs Frequency Figure 7: Gain vs Frequency

T HD(%) Leve l(d Br)

10 5.0000
4.0000
Vcc = 11V
3.0000 Rl = 8 ohm
Vc c = 11 V
Pout = 1W
Rl = 8 ohm 2.0000
1
1.0000

0.0

-1.000
P ou t = 1 00 mW
0.1
-2.000

-3.000
P out = 2 W
-4.000
0.0 10 -5.000
100 1k 10k 2 0k 10 100 1k 10k 100k
freq ue ncy (Hz) fre quency (Hz)

Figure 8: Output Power vs. Supply Voltage Figure 9: Total Power Dissipation & Efficiency
vs. Output Power
Po(W) Ptot(W) µ(%)
2 0.0 00
8 80
1 8.0 00
7 Ptot 70
1 6.0 00 R l = 8 ohm
f = 1K H z 6 60
1 4.0 00 d = 10% µ
1 2.0 00
5 50

1 0.0 00 4 40
Vcc = 11V
d = 1% Rl = 8ohm(both channels)
8 .00 00 3 30
f = 1KHz
6 .00 00
2 20
4 .00 00
1 10
2 .00 00
U
0 0
0 .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
2 .000 4 .00 0 6 .00 0 8 .000 1 0.00 1 2.00 1 4.0 0 1 6 .00 1 8 .00
Vs(V ) 2 X Pout(W)

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 TDA7266

Figure 10: Mute Attenuation vs. V pin.6 Figure 11: Stand-By Attenuation vs Vpin.7

Attenuation (dB) Attenuation (dB)

10 10
0 0
-10
-10
-20
-20 -30
-30 -40
-40 -50
-50 -60
-60 -70
-80
-70
-90
-80 -100
-90 -110
-100 -120
1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4
Vpin.6(V) 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)

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TDA7266

MULTIWATT15 PACKAGE MECHANICAL DATA

mm inch
DIM.
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
S1 1.9 2.6 0.075 0.102
Dia1 3.65 3.85 0.144 0.152

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 TDA7266

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

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