LA4620 Просмотр технического описания (PDF) - SANYO -> Panasonic
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LA4620 Datasheet PDF : 8 Pages
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Sample Printed Circuit Pattern
LA4620
Note
Board size :
Surface finish :
125 × 85mm
Copper foil
Design Notes
Input Capacitors
C1 and C4 are input coupling capacitors. They should
both be 4.7µF or less.
Feedback Capacitors
C2 and C5 from the negative feedback network. They
sould both be between 47 and 100µF.
Supply Decoupling Capacitor
C7 should be 100µF.
Supply Ripple Filter Capacitors
C8 and C14 smooth the supply voltage. Both should be at
least 1,000µF, and one of at least 2,000 µF can be used.
Startup Time Capacitor
C9 determines the amplifier startup time.
Bootstrapping Capacitors
C10, C13, C15 and C18 improve the device linearity for
a wide range of input signals. These capacitors should be
between 47µF and 100µF to improve the low-frequency
response.
Oscillation Suppression
The R1 and C3, and R2 and C6 networks suppress
oscillation. Use ceramic or mylar capacitors of 0.1µF or
more. Avoid using very large capacitances as these can
cause high-frequency distortion.
C11, C12, C16, and C17 from RC networks with R4, R5,
R6 and R7, respectively. Use mylar capacitors of 33nF or
more to prevent instability caused by circuit board layout.
Standby Control Current Limiting Resistor
R3 limits the current applied to STANDBY SW. It should
be 10Ω or more.
Heatsinking
The LA4620 should always be operated with a heatsink.
If the heatsink does not provide adequate thermal dissipa-
tion, the thermal protection circuit will attenuate the
signal level when the device overheats to prevent long-
term thermal stress.
Short-circuit Protection
If outputs can be shorted either to ground or the supply,
use an external circuit to protect the device as shown in
the following figure.
No.3607–7/8
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