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TDA7266S
5+5W DUAL BRIDGE AMPLIFIER
TDA7266S5+5W DUAL 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
DESCRIPTIONThe TDA7266S is a dual bridge amplifier specially
designed for TV and Portable Radio applications.
BLOCK AND APPLICATION DIAGRAM
ELECTRICAL CHARACTERISTICS (VCC = 11V, RL = 8Ω, f = 1kHz, Tamb = 25°C unless otherwise
specified.)
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
TDA7266S
Figure 1: Microprocessor Application
ELECTRICAL CHARACTERISTICS (Continued)
APPLICATION SUGGESTIONSTAND-BY AND MUTE FUNCTIONS
(A) Microprocessor ApplicationIn order to avoid annoying "Pop-Noise" during
Turn-On/Off transients, it is necessary to guaran-
tee the right St-by and mute signals sequence.
It is quite simple to obtain this function using a mi-
croprocessor (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
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.
TDA7266S
Figure 2: Microprocessor Driving Signals.
(B) Low Cost ApplicationIn low cost applications where the mP is not pre-
sent, 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.
TDA7266S
Figure 3a: Stand-alone Low-cost Application.
Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1).
TDA7266S
100 1k 10k 20k
THD(%)
frequency (Hz)
Figure 4: Distortion vs Frequency
5.0000 100 1k 10k 100k
Level(dBr)
frequency (Hz)
Figure 5: Gain vs Frequency11.5 22.5 33.5 44.5 5
Attenuation (dB)
Vpin.6(V)
Figure 6: Mute Attenuation vs. V pin.6 0.2 0.4 0.6 0.81 1.2 1.4 1.6 1.82 2.2 2.4
Attenuation (dB)
Vpin.7 (V)
Figure 7: Stand-By Attenuation vs Vpin.7
3456789 101112131415161718 Iq (mA)
Vsupply(V)
Figure 8: Quiescent Current vs. Supply Voltage
TDA7266S
