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FARM1E21 Datasheet(PDF) 7 Page - Vicor Corporation

Part # FARM1E21
Description  Filter/Autoranging Rectifier Module Up to 1000 Watts
Download  11 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

FARM1E21 Datasheet(HTML) 7 Page - Vicor Corporation

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FARM™
Rev 6.9
vicorpower.com
Page 7 of 11
06/2017
800 927.9474
FARMxxxx
+IN
PC (GATE IN)
PR
–IN
N
EMI GND
N/C
L
+
EN
150k
15VDC
Micro-
controller
Vicor DC-DC
Converter
FARM
BOK
ST
Not used with VI-260/VI-J60
Figure 10 — Enable (EN) function
Bus-OK (BOK) Pin: (See Figure 11) The Bus-OK pin is intended
to provide early-warning power fail information and is also
referenced to the negative output pin.
CAUTION: There is no input-to-output isolation in the FARM. It is
necessary to monitor Bus OK via an optoisolator if it is to be used on the
secondary (output) side of the converters. A line-isolation transformer
should be used when performing scope measurements. Scope probes
should never be applied simultaneously to the input and output as this
will damage the module.
Filter: (See Figure 12) An integral input filter consists of a
common mode choke and Y rated capacitors (line-ground)
plus two X rated capacitors (line-line). This filter configuration
provides common mode and differential mode insertion
loss in the frequency range between 100kHz and 30MHz as
illustrated in Figure 6.
Hold-up Capacitors: Hold-up capacitor values should be
determined according to output bus voltage ripple, power fail
hold-up time, and ride-through time (See Figure 13). Many
applications require the power supply to maintain output
regulation during a momentary power failure of specified
duration, i.e., the converters must hold-up or ride- through
such an event while maintaining undisturbed output voltage
regulation. Similarly, many of these same systems require
notification of an impending power failure in order to allow time
to perform an orderly shut down.
The energy stored on a capacitor which has been charged
to voltage V is:
Energy is given up by the capacitors as they are discharged by
the converters. The energy expended
(the power-time product) is:
Rearranging Equation 2 to solve for the required capacitance:
Application Note (Cont.)
+IN
PC
PR
–IN
N
EMI GND
N/C
L
+
BOK
ST
EN
Vicor DC-DC
Converter
Micro-
controller
15VDC
+5VDC
Secondary
referenced
Figure 11 — Bus OK (BOK) isolated power status indicator
4.7nF
L1
4.7nF
N
EMI GND
N/C
L
0.47µF
0.099µF
330µH
+
BOK
ST
EN
CM
Figure 12 — Internal filter
(1)
ε = 1/2(CV2)
Where:
ε = stored energy
C = capacitance
V = voltage across the capacitor
(2)
ε = Pt = C(V
1
2
–V
2
2
) / 2
Where:
P = operating power
t = discharge interval
V
1 = capacitor voltage at the beginning of
t
V
2 = capacitor voltage at the end of
t
(3)
C = 2Pt / (V
1
2
–V
2
2
)


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