LA4270 データシートの表示（PDF） - SANYO -> Panasonic
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LA4270 Datasheet PDF : 9 Pages
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LA4270
Sample Application Circuit 1 : Dual-channel use (specified Test Circuit)
Description of External Parts
C1, C4 :
Input capacitors
(4.7µF)
Since the DC potential of the input pins is not 0, the two capacitors cannot be omitted. Decreasing the
capacitor value extremely causes the frequency response to lower at low frequencies.
C2, C3 :
Feedback capacitors
(100µF)
Decreasing the capacitor value causes the frequency response to lower at low frequencies. Increasing
the capacitor value makes the starting time later.
C5 :
Ripple filter capacitor
(100µF/25V)
Decreasing the capacitor value provides less ripple rejection. Decreasing the capacitor value also
makes the starting time earlier.
C6, C9 :
Output capacitors
(1000µF/25V) Decreasing the capacitor value provides less power at low frequencies.
C7, C8 :
Oscillation blocking capacitors
(0.1µF polyester Decreasing the capacitor value causes oscillation to be liable to occur. It is recommended to use
film capacitors) polyester film capacitors which are excellent in high frequency response, temperature characteristic.
The use of electrolytic capacitors or ceramic capacitors may cause oscillation to occur at low tem-
peratures.
C10 :
Power capacitor
(470µF/35V)
Decreasing the capacitor value causes ripple to be liable to occur. If the distance between the IC and
this capacitor is made long or this capacitor is removed, oscillation may occur.
R1, R2 :
Resistors connected in series with oscillation blocking capacitors
(2.2Ω)
Used to prevent phase shift attributable to the oscillation blocking capacitors so that oscillation is
hard to occur. Increasing or decreasing the resistor value causes oscillation to be liable to occur. The
optimum value must be used.
No.1724–3/9
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