
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 IC01,IC02 - PIN 1 because dt is a very short.
2) SNUBBER circuit protects IC01,IC02 from damage
through leakage voltage suppression by RC,
(Charges the leakage voltage to D10,C12,C13
and discharges to R11,R12).
PT02 : Chrages the leakage voltage to D15,c18,c19 and
dischages to R20,R21
(c) Vcc circuit
1) R11, R12 : IC01 driving resistance (IC01 works through driving resistance at power cord in)
2) IC01 VCC: R13, D11, C11, ZD10,
IC02 VCC: D12, R16, C20, ZD11
!
Use the output of transformer as Vcc,because the current starts to flow into transformer while IC01, IC02 is
active
@
Rectify to D11, D12 and smooth to C11, C20.
#
Use the output of transformer as IC01, IC02 Vcc : The loads are different before and after IC01, IC02 driving.
(Vcc of IC01, IC02 decreases below OFF voltage , using only the resistance dut to lode increase after IC01,
IC02 driving.)
(d) Feedback Control Circuit
5.8V
L30, L33
D32
TRANS PT01
IC05
IC07
R32
R33
R34
R35
R47
R36
C39
IC01(ICE3B5065P)
D39
C35
C36, C42
Fig. 13-3
Содержание BD-P1000
Страница 10: ...Precautions 1 6 Samsung Electronics MEMO ...
Страница 14: ...Product Specification 2 4 Samsung Electronics MEMO ...
Страница 21: ...Disassembly and Reaasembly Samsung Electronics 4 7 4 2 PCB Location MAIN PCB SMPS PCB Fig 4 7 PCB Location ...
Страница 22: ...4 8 Samsung Electronics Disassembly and Reaasembly MEMO ...
Страница 23: ...Samsung Electronics 6 1 6 Exploded View and Parts List 6 1 Cabinet Assembly 6 2 ...
Страница 26: ...Exploded Views and Parts List 6 4 Samsung Electronics MEMO ...