Converter Operation - Sony DSC-S75 Training Manual

UNREG 1
Q007
4
FB
4
SYS
30
DD ON
SHUTDOWN
CONTROL
PROTECTION
13
SCP
1.5V
27
V REF.
The power supply circuits are located on two boards: BT-006 and FR-181:
•
The BT-006 board contains the unregulated supply lines from the battery and ac adapter, and its fuses, the
battery charging and ac adapter / battery switchover circuits, and the 300 volt dc–dc converter for the flash.
•
The dc-dc converters for all of the regulated power supply lines are on the FR-181 board. The dc-dc converters
are controlled by dc-dc control IC001.

Converter Operation

•
With the exception of unregulated always-on voltages and an unregulated battery voltage, all voltages are
produced by discrete switching circuits on the board.
•
The switching circuits are controlled and regulated by DC Control IC001, which provides the switching
signals to the discrete switchers.
-BLVO
56
FB
34
50
37
FB
IC001
DC
64
FB
14
57
FB
18
OUT 1
46
OUT 2
43
FB
40
FIGURE 15-1b - F707 POWER SUPPLY
UNREG 1
Q004, T001
+15V
DC-DC
CONV.
UNREG 2
5V
Q005
BOOST
4.9V REG
UNREG 3
Q009
3.2V REG
UNREG 3
Q010
UNREG 3
Q006, Q008
1.5V REG
36
15. DSC-F707 Power Supply
V REF.
CAM-7.5V
V REF.
REG.
Q015, Q016
-15.3V
REG.
13.5V LCD PANEL
Q013, Q014
-15.3V
REG.
3.2V, PANEL 3.2V
5V
REG
-7.5V
LCD
-15.3V
PANEL
CAMERA +15V
A4.9V, PANEL
CAM 5V
1.5V
12DSC02b 1532 10/8/02