Circuit Operating Descriptions
13-2
Samsung Electronics
0
Vswitch
dt
Toff
t
Inverted power
by leakage
inductance
Fig. 13-2
(b) SNUBBER Circuit :
PSRZ1, PSRZ2, PSCX1, PSCZ2, PSDZ1
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 PQIZ1 because dt is a very short.
2) SNUBBER circuit protects PQIZ1 from damage
through leakage voltage suppression by RC,
(Charges the leakage voltage to PSDZ1 and PSCX1
and discharges to PSRZ1, PSRZ2).
3) PSCZ2 : For noise removal
(c) PQIZ1 Vcc circuit
1) PQIZ1 Vcc : PVRL4, PVDL1, PVCL1
!
Use the output of transformer as Vcc,because the current starts to flow into transformer while PQIZ1 is
active
@
Rectify to PVDL1 and smooth to PVCL1.
#
Use the output of transformer as PQIZ1 Vcc : The loads are different before and after PQIZ1 driving.
(Vcc of PQIZ1 decreases below OFF voltage , using only the resistance dut to lode increase after PQIZ1
driving.)
(d) Feedback Control Circuit
ICE3B2065P
TRANS(PQTZ1)
PPDF1
PPLF1
PFRF5
PFRF3
PFID1
PBIZ1
PFRF1
PFRF2
PFRF6
PFCF1
PFRF4
PPCF3
PPC1
5.8V
Fig. 13-3
Summary of Contents for DVD-R157
Page 10: ...Precautions 1 6 Samsung Electronics MEMO...
Page 14: ...Product Specification 2 4 Samsung Electronics MEMO...
Page 37: ...Samsung Electronics 6 1 6 Exploded View and Parts List 6 1 Cabinet Assembly 6 2...
Page 40: ...Exploded Views and Parts List 6 4 Samsung Electronics MEMO...
Page 52: ...7 12 Samsung Electronics Electrical Parts List MEMO...
Page 60: ...Wiring Diagram 9 2 Samsung Electronics MEMO...
Page 66: ...PCB Diagrams 10 6 Samsung Electronics COMPONENT SIDE CONDUCTOR SIDE 10 3 Key PCB...
Page 67: ...PCB Diagrams Samsung Electronics 10 7 10 4 Function PCB COMPONENT SIDE CONDUCTOR SIDE...
Page 68: ...PCB Diagrams 10 8 Samsung Electronics MEMO...
Page 83: ...Samsung Electronics 12 1 12 Operating Instructions...
Page 84: ...Operating Instructions 12 2 Samsung Electronics...
Page 85: ...Operating Instructions 12 3 Samsung Electronics...
Page 86: ...Operating Instructions 12 4 Samsung Electronics...
Page 87: ...Operating Instructions 12 5 Samsung Electronics...
Page 88: ...Operating Instructions 12 6 Samsung Electronics...
Page 89: ...Operating Instructions 12 7 Samsung Electronics...
Page 90: ...Operating Instructions 12 8 Samsung Electronics...
Page 91: ...Operating Instructions 12 9 Samsung Electronics...
Page 92: ...Operating Instructions 12 10 Samsung Electronics...
Page 93: ...Operating Instructions 12 11 Samsung Electronics...
Page 94: ...Operating Instructions 12 12 Samsung Electronics...
Page 95: ...Operating Instructions 12 13 Samsung Electronics...
Page 96: ...Operating Instructions 12 14 Samsung Electronics...
Page 112: ...Circuit Operating Descriptions 13 16 Samsung Electronics MEMO...
Page 124: ...Reference Information 14 12 Samsung Electronics MEMO...