VI-ARM-C11 VICOR [Vicor Corporation], VI-ARM-C11 Datasheet - Page 7

• Manufacturer Part Number: VI-ARM-C11
• Description: Autoranging Rectifier Modules Up to 1500 Watts
• Manufacturer: VICOR [Vicor Corporation]

Vicor Corp. Tel: [phone] Fax: [phone]
Application Note, continued
Figure 9—Enable (EN) function; See Fig.8 for details
Figure 11—Filter connections
Figure 10—Bus OK (B OK) isolated power status indicator
GND
GND
L2/N
L2/N
Low power filter connections
High power filter connections
L1
L1
N
ST
L
N
ST
L
F1
Z1
F1
controller
Z1
controller
Micro-
C1
Micro-
150kΩ
27kΩ
390K
1/2W
R2
C1
R1
L1
L2
15Vdc
15Vdc
R3
R1
L3
BOK
BOK
L1
EN
EN
+V
+V
–V
–V
C2
C3
1/2W
L3
L2
R2
10
To additional modules
To additional modules
R4
Set your site on VICOR at www.vicorpower.com
C4
+5 Vdc
4700pF
4700pF
C2
C3
Secondary
referenced
N
ST
L
Part
L1,L4
L2, L3
C1
C2,C3,C4,C5
C6
R1
R2
F1
Z1
L4
Part
C1
C2, C3
C4
F1
L1, L2
L3
R1, R2
R3
R4
Z1
Description
1000µH 12A/6.5MΩ
22µH
.68µf (x type)
4700pf
.22µf (x type)
390k
10Ω
17A/250V
MOV
4700pF
4700pF
+In
Gate In (PC)
Gate Out (PR)
–In
C4
C5
1
1
Description
1.0µF
4700pF
0.15µF
12A fuse
27µH
1.3mH
10Ω
150kΩ, 0.5W
2.2Ω
MOV
/
/
2
2
W
W
+In
Gate In (PC)
Gate Out (PR)
–In
.22µF
C6
(X2)
Converter
Converter
DC-DC
DC-DC
Vicor
Part Number
02573
01000
03269
05147
14563
15016
00127-1503
03040
Vicor
Vicor
Part Number
02134
11479
02573
03285
04068
03040
Vicor
N
ST
L
Conver
DC-D
Vico
Co
D
ARM, Autoranging Rectifier Module
Bus-OK (B OK) Pin. (See Fig. 10). The Bus-OK pin is
intended to provide early-warning power fail information
and is also referenced to the negative output pin.
Filter. Two input filter recommendations are shown for low
power VI-ARM-1 and high power VI-ARM-2 (See Fig. 11).
Both filter configurations provide sufficient common mode and
differential mode insertion loss in the frequency range between
100kHz and 30MHz to comply with the Level B conducted
emissions limit.
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 Fig. 12). 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 shutdown.
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:
Caution: There is no input to output isolation in the ARM.
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 destroy the unit.
Where:
Where:
V
V
∆t = discharge interval
V = voltage across the capacitor
C = capacitance
C = 2P∆t / (V
ε
ε
ε
P = operating power
1
2
= 1/2(CV
= stored energy
= P∆t = C(V
= capacitor voltage at the beginning of ∆t
= capacitor voltage at the end of ∆t
2
)
1
2
1
–V
2
–V
2
2
2
)
2
) / 2
Rev. 2.4
Page 7 of 12
(1)
(2)
(3)