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FS-SD550R/FS-SD770R/FS-SD990R
LA4905 (IC301) : 2ch BTL power IC
1. Pinlayput
1
2. Block diagram
STBY
D.C
PRE GND
IN 1
BEEP
IN 2
ON TIME
1-24
23
Vcc
10
21
Switching
Standby SW
regulator block
Ripple
H.L.S.
20
filter
A B C D
H.L.S. :
Higher
Level signal
selector
2
Nonlinear/output stage
Input amplifier
3
CH 1
BEEP
amplifier
4
Input amplifier
CH 2
1
Nonlinear amplifier/output stage
ON MUTE
23
muting circuit
Vcc(SW)
11
SW
drive
Amplifier output stage
A
B
Power supply/ground shorting
protection circuit
Overvoltage/thermal protection
circuit
C
D
Pop noise
prevention circuit
8
9
15
SW B
14
SW E
12
SW OUT1
13
SW OUT2
SW GND
16
7
+OUT 1
PWR GND 1
5
6
-OUT 1
18
-OUT 2
19
PWR GND 2
17
+OUT 2
N.C.
22
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