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AN5274 Datasheet(PDF) 5 Page - Panasonic Semiconductor

No. de pieza AN5274
Descripción Electrónicos  4.0 W X 2 (18 V, 8 ohm) Power Amplifier with Mute Function and Volume Control
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Fabricante Electrónico  PANASONIC [Panasonic Semiconductor]
Página de inicio  http://www.panasonic.com/industrial/
Logo PANASONIC - Panasonic Semiconductor

AN5274 Datasheet(HTML) 5 Page - Panasonic Semiconductor

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5
ICs for Audio Common Use
AN5274
s Technical Information (continued)
• Application Note (continued)
4) Oscillation
To prevent oscillation, it is advisable to use RC (Zobel network) at output. C of polyester film capacitor has smaller
characteristic fluctuation with temperature and frequency. The resistor R connected in series with C is effective for
phase correction at high frequency, and as a result, it improves the oscillation allowance.
0.047
µF
RL = 8 Ω
20
C
Pin7
12
R
1000
µF
5) Power-ON/OFF pop-noise elimination
The output pins 7, 12 and VO, during power turns ON and OFF are shown below :
The turn ON time in the AN5274 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO
will turn on faster.
The turn OFF time is dependent on the capacitance value of CVCC. Pop-noise would occur when VCC voltage
declines faster than RF voltage. To solve this, increase the discharge time of VCC by increasing the capacitance
values of CVCC.
The recommended values of capacitance for CVCC and CRF are shown below :
CRF
CVCC
Recommended Operating VCC Range
Unit
33
µF
470
µF
14.5 to 27.5
V
CVCC
CRF
VCC
VO
Pin7
&
Pin12
Turn ON
time
Turn OFF
time
CRF = 100 µF
33
µF
47
µF


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