LA4508(2000) Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
componentes Descripción
Fabricante
LA4508 Datasheet PDF : 7 Pages
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LA4508
Sample Printed Circuit Pattern (Cu-foiled area)
Description of External Parts
C1 :
Decoupling capacitor
Used for the ripple filter. Since the rejection effect is saturated at a certain capacity, it is meaningless to
increase the capacity more than needed. This capacitor, being also used for the time constant of the pop
noise preventer, affects the starting time. Too small a capacity makes the pop noise level higher.
(Recommended value : 100µF to 330µF)
C2 (C3) :
Feedback capacitor
Since the low cutoff frequency depends on this feedback capacitor, the required bandwidth must be
considered before determining the value of this feedback capacitor. This feedback capacitor also affects
the starting time.
C4 (C5) :
Switching distortion suppressing capacitor
Used to suppress switching distortion which often appears at high frequencies in overinput mode. The
recommended value is 0.01µF (ceramic capacitor).
C6 (C7) :
Bootstrap capacitor
The output at low frequencies depends on this capacitor. If the capacity is decreased, the output at low
C8 (C9) :
frequencies goes lower. 47µF min. is required. (This, however, does not apply if load RL is light.)
Output capacitor
The low cutoff frequency depends on this output capacitor. (Refer to the characteristic graph.)
C10 (C11) : Oscillation blocking capacitor
Polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is used.
The use of an aluminum electrolytic capacitor or ceramic capacitor may cause oscillation to occur at
low temperatures.
C12 :
Power source capacitor.
This power source capacitor must accomodate loads (motor, etc.) in the power line or ripple in the
transformer ouput. This recommended value is 1000µF to 2200µF.
Continued on next page.
No.1440–3/7
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