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FDS3570 데이터시트(PDF) 3 Page - Fairchild Semiconductor

부품명 FDS3570
상세설명  Power Converter Topology and MOSFET Selection for 48-V Telecom
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDS3570 데이터시트(HTML) 3 Page - Fairchild Semiconductor

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3
Rev. A, June 2001
©2001 Fairchild Semiconductor Corporation
Figure 2. Typical waveforms for the flyback regulator.
Single Transistor Forward Converters
The forward converter achieves much better transformer utilization than the flyback design
since in theory, the transformer stores no energy. There is an extra inductor in the output
power path and an additional diode as well. Single transistor forward converters are useful in
48V system designs, up to 150 watts or so. A similar problem exists in the forward converter as
in the flyback design because the drain voltage is inherently unconstrained. Leakage
nductance in the power transformer will produce large voltage spikes that must be snubbed or
clamped.
VGS
-VSPIKE
-VIN + VFB
-VIN
VDS
ID(Q1)
ID1
VSW
VIN
IPK
0
TIME
SW
ON
VSAT
VFLBK
IPRI
0
TIME
ISEC
0
TIME
PWM'ED EDGE


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