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F3D480M20A Datasheet

  • F3D480M20A

  • VI Chip PFM Power Factor Module

  • 457.34KB

  • 14頁

  • VICOR   VICOR

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PRELIMINARY
PFM Theory of Operation cont.
PRM with PFC
The output of the VTM drives the PFC/PRM. The PFC/PRM (Figure 5 ) is
a microprocessor controlled, high-efficiency, zero-voltage switching
buck-boost regulator providing output voltage regulation and input
current shaping. The input voltage, isolated and adaptively
transformed by the VTM, and the PRM鈥檚 output voltage and output
current are sampled by the microprocessor. The processor uses a digital
algorithm to develop a control signal used to simultaneously regulate
the output voltage and shape the module input current, providing
harmonic current reduction. This control signal is fed to the switch
management ASIC. This provides proper switch timing, maintaining
zero-voltage switching under all operating conditions. Energy storage
is accomplished outside the PFM by means of an output capacitor that
may be sized to meet the user鈥檚 hold up requirements.
DC+
External Cap
+OUT
From VTM
To
External Cap
and
Load
鈥揙UT
ZVS Control
渭
Controller
Figure 5
鈥?The PRM with PFC
+IN
T2
1
Q1
2
T1
T2
2
Q2
1
Q5
+OUT
1
2
T2
PC
BV
T2
2
Q3
1
T1
鈥揙UT
Q6
2
1
T2
Frequency
Lock/Control
Proprietary Analog
Buck-Boost Control
T2
1
Q4
2
V
REF
1.25 V
30.1 k惟
1.25 V
Full Scale
渭P
PR
SG
SC
1 nF
鈥揑N
Figure 6
鈥?Functional block diagram of the PFM
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
Power Factor Module
F3D480T20A
Rev. 1.0
Page 6 of 14

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