5Vana And 2.5V Dc/Dc (Daughter Board); And 12V Dc/Dc (Daughter Board); Filter Circuits (Daughter Boards); Connector Assignments - LeCroy WaveSurfer 400 Series Service Manual

4.7.3.5 +5VANA and 2.5V DC/DC (Daughter Board)

4.7.3.6 +9 and 12V DC/DC (Daughter Board)

4.7.3.7 -5V and –12V Forward converter

4.7.3.8 Filter Circuits (Daughter Boards)

4.7.4 Connector Assignments

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