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Description of major ICs
@ LA4905 (IC301) : 2ch BTL power IC
1. Pinlayput
: O
ONG
TT
2. Block diagram
Vec
FS-SD5R/FS-SD7R/FS-SD9R
Ripple
D.C
(20
filter
Higher
Level signal
selector
PRE GND (2)
Nonlinear/output stage
Input amplifier
IN 1
BEEP
amplifier
Power supply/ground shorting
Overvoltage/thermal protection
circuit
Input amplifier
Nonlinear amplifier/output stage
( )
ON MUTE
|
ON-TIME
(29
muting circuit
ie
Pop noise
prevention circuit
oO
—_
les)
©)—O-@
SWB
SWE
SW OUT1
SW OUT2
SW GND
+OUT 1
PWR GND 1
-OUT 1
-OUT 2
PWR GND 2
+OUT 2
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