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FQA16N50 データシート(PDF) 6 Page - Fairchild Semiconductor

部品番号 FQA16N50
部品情報  Optimized Switch for Discontinuous Current Mode Power Factor Correction
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FQA16N50 データシート(HTML) 6 Page - Fairchild Semiconductor

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AN-9066
APPLICATION NOTE
Output Power [W]
0
100
200
300
400
500
600
93
94
95
96
97
98
UniFET, 20A/500V
Super-junction, 21A/500V
Figure 7. Efficiency Curves with 115V AC Input
The efficiency results are shown in Figure 7. There is not
much difference in efficiency when in heavy load.
Basically, the super-junction device has lower RDS(on) than
the UniFET at same drain current rating and therefore will
have more conduction loss advantage as the load becomes
heavier. The smaller switching loss of the UniFET
compensates its higher RDS(on) well in heavy load area and
the UniFET shows slightly better performance. In the light-
load area, the switching loss dominates the power losses
and the UniFET surpasses the super-junction device.
Conclusion
The performance of the UniFET
was evaluated at both
device level and system level. It showed good results
against the super-junction device and can be an optimum
solution in DCM PFC application as long as required
breakdown voltage of the boost switch is 500V. The
interleaved DCM PFC is gaining attention recently and this
is another application where the UniFET can be considered
as a high-performance, cost-effective boost switch.
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 4/3/09
6


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