TDA7266SA ,7W+7W DUAL BRIDGE AMPLIFIERTDA7266SA7W+7W DUAL BRIDGE AMPLIFIER■ WIDE SUPPLY VOLTAGE RANGE (3.5-18V)TECHNOLOGY BI20II■ MINIMUM ..
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TDA7266SA
7W+7W DUAL BRIDGE AMPLIFIER
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TDA7266SASeptember 2003 WIDE SUPPLY VOLTAGE RANGE (3.5-18V) MINIMUM EXTERNAL COMPONENTS NO SWR CAPACITOR NO BOOTSTRAP NO BOUCHEROT CELLS INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION
DESCRIPTIONThe 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.
7W+7W DUAL BRIDGE AMPLIFIER
BLOCK AND APPLICATION DIAGRAM
TDA7266SA 2/11
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION (Top view)
ELECTRICAL CHARACTERISTCS (VCC = 11V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
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TDA7266SA
APPLICATION SUGGESTIONSTAND-BY AND MUTE FUNCTIONS
(A) Microprocessor ApplicationIn 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 μP) 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
ELECTRICAL CHARACTERISTCS (continued)(VCC = 11V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
TDA7266SA 4/11
Figure 2. Microprocessor Driving Signals
B) Low Cost ApplicationIn 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.
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TDA7266SA
Figure 3. Stand-alone low-cost Application
Figure 4. Distortion vs Frequency Figure 5. Gain vs Frequency
TDA7266SA 6/11
Figure 6. Mute Attenuation vs Vpin.8
Figure 7. Stand-By attenuation vs Vpin 9
Figure 8. Quiescent Current vs Supply Voltage
