vi-armb-c123 Vicor Corporation, vi-armb-c123 Datasheet - Page 6

• Manufacturer Part Number: vi-armb-c123
• Description: Autoranging Rectifier Modules Up To 1500 Watts
• Manufacturer: Vicor Corporation

The ARM maintains the DC output bus voltage between 200
and 375 Vdc over the entire universal input range, this being
compatible with Vicor VI-260 series and VI-J60 series DC-DC
converters, as well as Vicors Maxi, Mini, Micro 300 V input
Vicor converters. The ARM automatically switches to the
proper rectification mode (doubled or undoubled) depending
on the input voltage, eliminating the possibility of damage due
to improper line connection. The VI-ARM -x 1 is rated at 500 W
in the low range (90-132 Vac input), and 750 W in the high
range (180 – 264 Vac input). The VI-ARMB -x 2 is rated for 750
W and 1500 W for the low and high input ranges respectively.
Either of these modules can serve as the AC front end for any
number and combination of compatible converters as long as
the maximum power rating is not exceeded. See VI-ARMB
derating curves. (Figures 1, and 2)
connections, it is necessary to connect the Strap pin to the
junction of the series holdup capacitors (C1, C2, Fig. 10)
for proper (autoranging) operation. Varistors across the
capacitors provide input transient protection. The bleeder
resistors (R1, R2, Fig. 10) discharge the holdup capacitors
when power is switched off.
connected to the Gate-In or PC pin of all converter modules to
disable the converters during power-up. Otherwise, the
Figure 10 — Converter connections
Vicor Corp. Tel: [phone] Fax: [phone]
PE
In addition to input and output power pin
N
L
(See Fig. 11). The Enable pin must be
F3
Z1
Part
C1,2
C3–6
R1,2
V1,2
F1,2
D1,2
C7,8
Z1
D3,D4
C10,C11
R3, R4**
F3
Sizing PCB traces:
All traces shown in bold carry significant
current and should be sized accordingly.
**
*Required if C1 & C2 are located more than
Filter
6 inches (15 cm) from output of VI-ARM.
Not used with VI-260/VI-J60
*
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ABC-10 A VI-ARM-_1
ABC-15 A VI-ARMB-_2
Use recommended fusing for
specific DC-DC Converter
N
ST
L
(Y2 type)
VI-ARM
Part Number
01000
00127-1503
20461-220
00670
06852
30076
26108
Vicor
BOK
EN
+V
–V
To additional modules
Not used with VI-260/VI-J60
C7*
C8*
R3
R4
ARM, Autoranging Rectifier Module
V1
V2
converters would attempt to start while the holdup capacitors
were being charged through an un-bypassed thermistor,
preventing the bus voltage from reaching the thermistor bypass
threshold thus disabling the power supply. The Enable output
(the drain of an N channel MOSFET) is internally pulled up to
15 V through a 150 kΩ resistor.
A signal diode should be placed close to and in series with the
PC/Gate-In pin of each converter to eliminate the possibility of
control interference between converters. The Enable pin
switches to the high state (15 V) with respect to the negative
output power pin to turn on the converters after the power-up
inrush is over. The Enable function also provides input
overvoltage protection for the converters by turning off the
converters if the DC bus voltage exceeds 400 Vdc. The
thermistor bypass switch opens if this condition occurs,
placing the thermistor in series with the input voltage, which
reduces the bus voltage to a safe level while limiting input
current in case the varistors conduct. The thermistor bypass
switch also opens if a fault or overload reduces the bus voltage
to less than 180 Vdc.
D1
D2
R1
R2
C1
C2
D4
F1
F2
D3
C11
C10
C6
C3
C4
C5
+IN
PC (GATE IN)
PR
–IN
+IN
PC (GATE IN)
PR
–IN
(Gate In)
(Gate In)
Vicor DC-DC
Vicor DC-DC
Converter
Converter
Rev. 3.8
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