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TDA7266L-J15-A-T 데이터시트(PDF) 4 Page - Unisonic Technologies

부품명 TDA7266L-J15-A-T
상세설명  77W DUAL BRIDGE AMPLIFIER
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제조업체  UTC [Unisonic Technologies]
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TDA7266
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
4 of 7
www.unisonic.com.tw
QW-R107-037,A
APPLICATION SUGGESTION
For Microprocessor Application
In 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 Fig 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 maintain 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.
C5
470µF
C6
100nF
Vcc
13
3
1
2
15
14 OUT2-
OUT2+
OUT1-
OUT1+
PW-GND
MUTE
IN2
ST-BY
IN1
S-GND
7
4
9
12
6
8
C1
0.22µF
R1
10k
C2
10µF
C3
0.22µF
R2
10k
C4
1µF
µP
TDA7266
Fig. 1 Microprocessor Application


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