4-18 Theory of Operation
4.7.3.5 +5VANA and 2.5V DC/DC
(Daughter Board)
Dual 2-phase
synchronous step-down switching regulator is used for the
+5.0Vana and 2.5V supply.
4.7.3.6 +9 and 12V DC/DC
(Daughter Board)
S
tep-down switching regulator is used for the +9.0V supply. Synchronous
step-down switching regulator
is used for the +12V supply.
4.7.3.7 -5V and –12V Forward converter
This converter is used for the –5.0V supply. There is also a linear regulator
which supplies the –12V supply.
4.7.3.8 Filter Circuits
(Daughter Boards)
The Filter circuits are implemented for analog outputs ;+5.0V,+12.0V,-5.0V
and –12.0V.
4.7.4 Connector Assignments
The power supply connectors are arranged as follows:
INLET BOARD
Reference
Supplied BOARD
Connector Pin# Voltage /Function Comment
1CN2 PFC BOARD 5566-2A Total 2 Input AC Line
PFC BOARD
2CN2 INLET BOARD 5566-2A Total 2 Input AC Line
1 385VDC
2CN3 MAIN BOARD 5566-2A
2 Primary Return
1 18.5VDC
2 Primary Return
2CN1 MAIN BOARD 5267-3A
3 Traiac Bias
1 Line
2CN4 MAIN BOARD 5267-2A
2 GND
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