ST TDA7266SA User Manual
TDA7266SA
7W+7W DUAL BRIDGE AMPLIFIER
■ WIDE SUPPLY VOLTAGE RANGE (3.5-18V) |
TECHNOLOGY BI20II |
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■ MINIMUM EXTERNAL COMPONENTS |
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– NO SWR CAPACITOR |
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– NO BOOTSTRAP |
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– NO BOUCHEROT CELLS |
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– INTERNALLY FIXED GAIN |
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■ STAND-BY & MUTE FUNCTIONS |
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■ SHORT CIRCUIT PROTECTION |
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■ THERMAL OVERLOAD PROTECTION |
CLIPWATT15 |
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ORDERING NUMBER: TDA7266SA |
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DESCRIPTION |
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The TDA7266SA is a dual bridge amplifier specially designed for LCD Monitor, PC Motherboard, TV and Portable Radio applications.
BLOCK AND APPLICATION DIAGRAM
Pin to pin compatible with: TDA7266S, TDA7266, TDA7266M, TDA7266MA, TDA7266B, TDA7297SA & TDA7297.
VCC
470 F 
100nF
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0.22 F |
3 |
13 |
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IN1 |
4 |
+ |
1 |
OUT1+ |
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- |
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ST-BY |
7 |
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S-GND |
- |
2 |
OUT1- |
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9 |
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Vref |
+ |
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0.22 F |
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IN2 |
12 |
+ |
15 |
OUT2+ |
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- |
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MUTE |
6 |
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PW-GND |
- |
14 OUT2- |
+ |
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8 |
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D94AU175B
September 2003 |
1/11 |
TDA7266SA
ABSOLUTE MAXIMUM RATINGS
Symbol |
Parameter |
Value |
Unit |
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Vs |
Supply Voltage |
20 |
V |
IO |
Output Peak Current (internally limited) |
2 |
A |
Ptot |
Total Power Dissipation (Tamb = 70°C) |
20 |
W |
Top |
Operating Temperature |
0 to 70 |
°C |
Tstg, Tj |
Storage and Junction Temperature |
-40 to 150 |
°C |
THERMAL DATA
Symbol |
Parameter |
Value |
Unit |
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Rth j-case |
Thermal Resistance Junction-case |
Typ = 1.8; Max. = 2.5 |
°C/W |
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Rth j-amb |
Thermal Resistance Junction-ambient |
48 |
°C/W |
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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+ |
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D03AU1463 |
ELECTRICAL CHARACTERISTCS
(VCC = 11V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
Symbol |
Parameter |
Test Condition |
Min. |
Typ. |
Max. |
Unit |
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VCC |
Supply Range |
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3 |
11 |
18 |
V |
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Iq |
Total Quiescent Current |
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50 |
65 |
mA |
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VOS |
Output Offset Voltage |
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120 |
mV |
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PO |
Output Power |
THD 10% |
6.3 |
7 |
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W |
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THD |
Total Harmonic Distortion |
PO = 1W |
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0.05 |
0.2 |
% |
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PO = 0.1W to 2W |
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1 |
% |
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f = 100Hz to 15KHz |
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SVR |
Supply Voltage Rejection |
f = 100Hz, VR =0.5V |
40 |
56 |
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dB |
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CT |
Crosstalk |
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46 |
60 |
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dB |
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AMUTE |
Mute Attenuation |
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60 |
80 |
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dB |
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Tw |
Thermal Threshold |
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150 |
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°C |
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GV |
Closed Loop Voltage Gain |
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25 |
26 |
27 |
dB |
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GV |
Voltage Gain Matching |
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0.5 |
dB |
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2/11
TDA7266SA
ELECTRICAL CHARACTERISTCS (continued)
(VCC = 11V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
Symbol |
Parameter |
Test Condition |
Min. |
Typ. |
Max. |
Unit |
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Ri |
Input Resistance |
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25 |
30 |
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KΩ |
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VTMUTE |
Mute Threshold |
for VCC > 6.4V; Vo = -30dB |
2.3 |
2.9 |
4.1 |
V |
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for VCC < 6.4V; Vo = -30dB |
VCC/2 |
VCC/2 |
VCC/2 |
V |
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-1 |
-075 |
-0.5 |
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VTST-BY |
St-by Threshold |
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0.8 |
1.3 |
1.8 |
V |
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IST-BY |
St-by Current V6 = GND |
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100 |
μA |
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eN |
Total Output Voltage |
A Curve; f = 20Hzto 20KHz |
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150 |
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μV |
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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 Stby 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 μP) 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 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
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VCC |
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C1 0.22μF |
3 |
13 |
C5 |
C6 |
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470μF |
100nF |
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IN1 |
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4 |
1 |
OUT1+ |
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+ |
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ST-BY |
R1 10K |
- |
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7 |
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C2 |
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10μF |
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μP |
S-GND |
9 |
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- |
2 |
OUT1- |
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Vref |
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C3 0.22μF |
+ |
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12 |
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IN2 |
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15 |
OUT2+ |
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+ |
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MUTE |
R2 10K |
- |
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6 |
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C4 |
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1μF |
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PW-GND |
- |
14 OUT2- |
+ |
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8 |
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D95AU258A
3/11
TDA7266SA
Figure 2. Microprocessor Driving Signals
+VS(V) |
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VIN |
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(mV) |
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VST-BY |
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pin 7 |
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1.8 |
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1.3 |
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0.8 |
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VMUTE |
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pin 6 |
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4.1 |
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2.9 |
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2.3 |
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Iq |
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(mA) |
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VOUT |
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(V) |
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OFF |
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PLAY |
MUTE |
ST-BY |
OFF |
ST-BY |
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D96AU259mod |
MUTE |
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B) Low Cost Application
In low cost applications where the μP 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.
4/11
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