SA-VE225/WMS225/SS-CN225/V225
3
3
THERMAL
SHUTDOWN
BIPOLAR
TRANSCONDACTANCE
INPUT STAGE
STANDBY/
MUTE
BOOST-
STRAP
MOS GAIN &
LEVEL SHIFTING
STAGE
STBY
-GND
IN–
IN+
IN+ MUTE
NC
BOOSTSTRAP
+VS
–VS
STBY
MUTE
NC
NC
+PWVS
OUT
–PWVS
14 15
12
13
10
11
8 9
6
7
5
3
4
1 2
+
–
MOS
OUTPUT
STAGE
SHORT
CIRCUIT
PROTECTION
1
2
3
4
5
6
7
8
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
VCC ON
MUTE
AC OFF
DET
OVER LOAD DET
OFFSET DET
AUTO RESET
AC OFF DET
GND
RELAY DRIVE
VCC ON MUTE
VCC
• IC Block Diagrams
– MAIN Board –
IC302
µ
PC1237HA
•
Circuit Boards Location
SA-WMS225
POWER IC board
POWER SW board
LED board
CONTROL board
MAIN board
– POWER IC Board –
IC401
TDA7294
