Circuit Operating Descriptions
13-2
Samsung Electronics
0
Vswitch
dt
Toff
t
Inverted power
by leakage
inductance
Fig. 13-2
1) Prevent residual high voltage at the terminals of
switch during switch off/Suppress noise.
High inverted power occurs at switch off,
because of the 1st winding of transformer :
(V=-L1 xdi/dt. L1 : Leakage Induction)
A very high residual voltage exist on both terminals
of QISO1 because dt is a very short.
2) SNUBBER circuit protects QISO1 from damage
through leakage voltage suppression by RC,
(Charges the leakage voltage to PSDZ1 and PSCX1
and discharges to PSRZ1, PSRZ2).
3) PPCF2 : For noise removal
(c) PQIZ1 Vcc circuit
1) RIS13, RIS14, RIS15 : ICISO1 driving resistance (ICISO1 works through driving resistance at power cord in)
2) ICISO1 Vcc : CISI3, RISI8, DISO3
!
Use the output of transformer as Vcc,because the current starts to flow into transformer while ICISO1 is
active
@
Rectify to DISO3 and smooth to CISI3.
#
Use the output of transformer as ICISO1 Vcc : The loads are different before and after ICISO1 driving.
(Vcc of ICISO1 decreases below OFF voltage , using only the resistance dut to lode increase after ICISO1
driving.)
(d) Feedback Control Circuit
ICISO1
TRANS(PTO1)
PIS34
CIS34
CIS35
RIS33
CIS36
RIS34
RIS32
RIS31
RIS30
ICIS03
ICIS02
PPLD1
V5cc
Fig. 13-3
Summary of Contents for DVD-HR755
Page 70: ...Samsung Electronics 9 1 9 Wiring Diagram ...
Page 72: ...PCB Diagrams 10 2 Samsung Electronics 10 1 S M P S PCB COMPONENT SIDE ...
Page 73: ...PCB Diagrams Samsung Electronics 10 3 CONDUCTOR SIDE ...
Page 78: ...10 4 HDMI PCB CONDUCTOR SIDE IC1 COMPONENT SIDE PCB Diagrams 10 8 Samsung Electronics ...
Page 79: ...PCB Diagrams Samsung Electronics 10 9 10 5 Function PCB CONDUCTOR SIDE COMPONENT SIDE ...
Page 101: ...Samsung Electronics 12 1 12 Operating Instructions ...
Page 102: ...Operating Instructions 12 2 Samsung Electronics ...
Page 103: ...Operating Instructions Samsung Electronics 12 3 ...
Page 104: ...Operating Instructions 12 4 Samsung Electronics ...
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