Furuno FS-1503 - 2.7 SW REG Board (Option)

2-27
2.7 SW REG Board (option)
The negative line of the power supply and the negative ground of the circuit boards
(chassis) shares a common earth. When a floating ground that separates the negative line
and the negative ground is needed, SW REG board is to be added.
PA/FIL board and SW REG board are connected by connectors as follows. The necessary
connector assembly comes with to the SW REG board.
J1 J2
J2
J3
13.6 V +
13.6 V -
OPTION
SW REG
(05P0668)
PA/FIL
(05P0667)
TB1 TB2
J7
+ 12V
30 A
30 A
J3-1 +12 V
-2 +12 V
-3 -0 V (GND)
-4 -0 V (GND)
J1-1 +12 V
-2 +12V
-3 -0 V (GND)
-4 -0 V (GND)
J7 -1 +12 V
-2 +12 V
-3 -0 V (GND)
-4 -0 V (GND)
-5 -0 V (GND)
PA/FIL Board SW REG Board
J2
J3
→
→
J1
J2
Figure 2-21 Connection of SW REG Board
The block diagram of the SW REG board is shown in Figure 2-22. The power supply
voltage for the board is +13.6 V and the switching regulator outputs +13.0 mV. R15
(AVR) adjusts the output voltage. The oscillating frequency of the switching regulator,
measurable between TP1 and TP2, is 170 kHz
±
20 kHz, which is determined by R9 and
C10 connected to U1.
RECTDRIVE FILT
CONT DET
Q1 (2SK1266)
T1
U1 (
µ
PC1094C)
R15
AVR
U2 (TLP521)
U3 (
µ
PC1093J)
CR1 FL1
TP2
TP1
13.6 V +
13.6 V -
+13 V
-13 V
C10R9
Figure 2-22 Block Diagram of SW REG Circuit