Main Switching Power Supply Circuit - Sony KV-13FS100 Product & Training Manual

Main Switching Power Supply Circuit

AC FROM
T601
D605
FROM
RY600
R601
FILTER
CIRCUIT
- All voltages are present under
normal operating conditions and
all referenced to HOT GRND.
Except for IC600/pin 14 which
is referenced to IC600/pin 15
(VS).
The Main Switching Power supply is basically IC600 (Switch Regulator Controller). IC600 contains all the needed
circuitry necessary to function as a switching power supply, except for the Power Switching MOSFETS (Q600
and Q601).
IC600 contents:
•
Control circuit
•
Oscillator/Oscillator control
•
Output Driver transistors
•
10V regulator
•
Shut-Off Timer
•
Over Current Protection
Main Switching Power Supply Operation
Reference Figure 3-3 for the following circuit description:
AC signal is applied to the rectifier block D605. The AC component is filtered-out by the filter circuit (C629 and
C621 shown in block form). A DC voltage of 293V is produced at this time.
TO T602 STANDBY POWER
SUPPLY
R630
R615
R640
R629
291V
18
VD
VG
R627
16
2.7V
(H)
V
1
SENSE
VS
R626
15
IC600
VG
10.2V
12
VB
14
(L)
D618
VC2
10
OCP
10.6V
TIMER
9
6
0V
F/B
C634
VC1
2
8
1.9V 24V
C642
R625
FIGURE 3-3 - MAIN SWITCHING POWER SUPPLY
Q600
145V
275Vpp
85KHz
2
140V
Q601
R671 C672
4
4.5V
R647
0V
R632
D631
6
R619
7
PH602
3
2
4 1
11
3. Power Supply Block
IC633
IC603
T603
14V
12
11
D621
14V
10
15
D615
14
13
D611
17
D624
R668
16
1
IC604
5
ERROR
AMP.
4
12V FROM
9V SUPPLY
3.3CTV30a 1443
3.3V
9V
TO
DEGAUSS
RY501
TO PH602
PIN1
15V
+135V
D614
3/26/02