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IXDN0036 데이터시트(PDF) 33 Page - IXYS Corporation

부품명 IXDN0036
상세설명  Several lamp types
PDF  41 Pages
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제조업체  IXYS [IXYS Corporation]
홈페이지  http://www.ixys.com
Logo IXYS - IXYS Corporation

IXDN0036 데이터시트(HTML) 33 Page - IXYS Corporation

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Conclusion
7-34
ATAVRFBKIT / EVLD001 User Guide
7597A–AVR–02/06
The lamps are dimmed for as long as the switch is pressed or until the minimum or max-
imum dimmer setting is reached.
7.2
Appendix 2:
Capacitor
Coupled Low
Voltage Supply
Small currents for the low voltage supply can be obtained from the AC line at
low loss by means of capacitor coupling as shown in the figures below. To esti-
mate the required size of the coupling capacitor, use the following relationships
for current, charge, voltage and capacitance.
1.dQ/dt = I
DC
Figure 7-1. Negative Line Half Cycle
Figure 7-2. Positive Line Half Cycle
1.dV = 2Vpk-Vo-2V
D
2.dQ = CdV or C = dQ/dV
For example, to obtain 15 ma at 20 VDC from a 220 Vrms 50 Hz line:
1.dQ/dt = (15 millijoules/sec)/(50 cycles/sec) or 0.3 millijoules / cycle.
AC
C1
VD
VD
C2
“Negative” line half -cycle:
C1 charges to Vpk - VD with polarity shown.
Vo
Ich1
IDC
-VPK
-VC1 +
AC
C1
VD
VD
C2
“Positive” line half -cycle:
C1 charges to Vpk - VD - Vo with polarity shown.
Vo
Ich2
IDC
+VPK
+ VC1 -



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