Data Sheet
VI-ARM
Features
•
•
•
•
RoHS Compliant (with F or G pin option)
Autoranging input
Microprocessor controlled
VI-ARM-C1:
500 W @ 90 – 132 Vac
750 W @ 180 – 264 Vac
VI-ARMB-C2:
750 W@ 115 Vac
1500 W @ 230 Vac
96 – 98% efficiency
100˚C baseplate (no derating)
cULus, cTÜVus, CE Marked
AC Bus OK, module enable
Inrush limiting (no external circuitry)
CE Marked
TM
Autoranging Rectifier Modules
Up to 1500 Watts
•
Actual size:
2.28 x 1.45 x 0.5 in
57,9 x 36,8 x 12,7 mm
•
•
•
•
•
•
Absolute Maximum Ratings
Parameter
L to N
+ Out to –Out
B OK to –Out
EN to –Out
Output power
VI-ARM
VI-ARMB
Rating
264
280
400
16
16
500/750
750/1500
4 – 6 (0.45 – 0.68)
–55 to +100
–65 to +125
500 (260)
750 (390)
Unit
Vac
Vac
Vdc
Vdc
Vdc
Watts
Watts
in-lbs (N-m)
°C
°C
°F (°C)
°F (°C)
115/230 V
115/230 V
See page 3 for derating
6 each, 4-40 screw
M-Grade
M-Grade
< 5 sec; wave solder
< 7 sec; hand solder
Notes
100 ms
Typical Applications:
systems requiring a
rugged, full featured interface to the AC
mains in the smallest possible package.
Product Highlights
The ARM (Autoranging Rectifier Module) is
an AC front end module which provides
autoranging line rectification and inrush
current limiting. The ARM is available in
either 500/750 W or 750/1500 W models in a
quarter brick package measuring only
2.28" x 1.45" x 0.5".
The ARM interfaces directly with worldwide
AC mains and may be used with Vicor
300 V input DC-DC converters to realize an
autoranging, high density, low profile
switching power supply. The ARM includes
a microcontroller that continuously monitors
the AC line to control bridge/doubler
operation. The user need only provide
external capacitance to satisfy system hold-
up requirements.
Vicor Micro series packaging technology
offers flexible mounting options for various
manufacturing processes. The ARM may be
installed as a conventional leaded device for
on-board applications, in-board for low
profile, height restricted applications,
socketed or surface mounted with optional
ModuMate interconnect products.
Mounting torque
Operating temperature
Storage temperature
Pin soldering temperature
Thermal Resistance Capacity
Parameter
Baseplate to sink
flat, greased surface
with thermal pad (P/N 16495)
Baseplate to
ambient
free convection
1000 LFM
Thermal capacity
Min
Typ
0.24
0.3
15
2.7
48
Max
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Watt-sec/°C
Part Numbering
VI-ARM
Product
-
C
1
Type*
1
= 500/750 W
2
= 750/1500 W
1
=
2
=
S
=
N
=
F
=
G
=
2
Pin Style**
Short
Long
Short Modumate
Long Modumate
Short RoHS
Long RoHS
Blank
= 500/750 W
B
= 750/1500 W
Product Grade Temperatures (°C)
Grade Operating
Storage
C
= – 20 to +100
– 40 to +125
T
= – 40 to +100
– 40 to +125
H
= – 40 to +100
– 55 to +125
M
= – 55 to +100
– 65 to +125
*Type 1 only refers to the VI-ARM; Type 2 refers to VI-ARMB
**Pin styles S, N, F & G
are
compatible with the ModuMate interconnect system for socketing
and
surface mounting.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.9
Page 1 of 11
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ELECTRICAL CHARACTERISTICS
Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperature,
unless otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate. Specifications apply
for AC mains having up to 5% total harmonic distortion.
INPUT SPECIFICATIONS
VI-ARM - 1
Parameter
Operating input voltage
Input
undervoltage
Input surge withstand
AC line frequency
Input current, rms
Power factor
Inrush current
Holdup Capacitance
47
47
0
0
0.60
30
1600
Min
90
180
Typ
Max
132
264
90
280
63
880
7.4
5.4
47
47
0
0
0.60
30
2400
Amps
F
Min
90
180
VI-ARMB - 2
Typ
Max
132
264
90
280
63
880
11.1
7.2
Unit
Vac
Vac
Vac
Vac
Hz
Hz
Amps
Amps
Notes
Autoranging (doubler mode)
Autoranging (bridge mode)
No damage
100 ms
C-Grade
T, H & M-Grade
120 Vac
240 Vac
Typical line voltage
condition
264 Vac peak line,
cold start
OUTPUT SPECIFICATIONS
VI-ARM - 1
Parameter
Output power
Efficiency
120 Vac
240 Vac
Output voltage
Min
0
0
94
96
200
96
98
375
Typ
Max
500
750
Min
0
0
94
96
200
96
98
375
VI-ARMB - 2
Typ
Max
750
1500
Unit
Watts
Watts
%
%
Vdc
90 – 264 Vac
Notes
105 – 132 Vac (Fig. 1)
210 – 264 Vac (Fig. 2)
CONTROL PIN SPECIFICATIONS
Parameter
AC Bus OK (B OK)
On-state resistance (low)
On-state current (low)
Off-state voltage
On-state threshold
Off-state threshold
Module Enable (EN)
On-state resistance (low)
On-state current (low)
Off-state voltage
On-state threshold
Off-state threshold
Over voltage shutdown
AC Bus OK - module enable,
differential error*
Min
Typ
Max
15
-50
15.2
245
210
15
50
15.2
245
195
400
20
Unit
Ω
mA
Vdc
Vdc
Vdc
Ω
mA
Vdc
Vdc
Vdc
Vdc
Vdc
AC Bus OK
and
module enable thresholds track
Notes
To negative output -
bus
normal
Bus normal
Bus
abnormal,
27 K internal pull
up
to 15 Vdc (Fig. 12)
Output
bus
voltage
Output
bus
voltage
To negative output - converters
are
disabled
150 K internal pull
up
to 15 Vdc (Fig. 11)
Output
bus
voltage
Output
bus
voltage
14.8
235
200
15.0
240
205
14.8
235
185
380
15
15.0
240
190
390
17
*
Tracking error
between
BUS OK
and
Enable thresholds
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.9
Page 2 of 11
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ELECTRICAL CHARACTERISTICS (CONT.)
SAFETY SPECIFICATIONS
Parameter
Isolation voltage (in to out)
Dielectric withstand
(I/O to
baseplate)
Leakage current
1,500
100
Min
Typ
None
V
RMS
A
No filter
Max
Unit
Notes
Isolation provided
by
DC-DC converter(s)
AGENCY APPROVALS
Safety Standards
ARM1 xxx
UL60950, EN60950, CSA 60950
Agency Markings
Notes
Baseplate earthed, fast
acting
line fuse,
Bussman ABC10
Low voltage directive
Baseplate earthed, fast
acting
line fuse,
Bussman ABC15
Low voltage directive
cTÜVus
CE Marked
ARM2 xxx
UL60950, EN60950, CSA 60950
cTÜVus
CE Marked
GENERAL SPECIFICATIONS
Parameter
MTBF
Baseplate material
Cover
Pin material
Weight
Size
1.6 (45)
2.28 x 1.45 x 0.5
(57,9 x 36,8 x 12,7)
ounces (grams)
inches
(mm)
Min
Typ
>1,000,000
Max
Unit
hours
Notes
25˚C, ground
benign
Aluminum
Kapton insulated
aluminum,
plastic molded terminal
blocks
Copper, tin/lead solder dipped (solder pins)
Gold plated nickel copper (Modumate
and
RoHS)
VI-ARMB DERATING
760
750
740
730
720
710
700
690
680
670
660
650
640
630
90
95
100
105
110
115
120
125
130
1520
1500
1480
1460
1440
1420
1400
1380
1360
1340
1320
1300
1280
1260
180
190
200
210
220
230
240
250
260
Output Power (Watts)
Input Voltage (AC)
Output Power (Watts)
Input Voltage (AC)
Figure 1
— 90 – 130 Vac ARMB output power rating
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Figure 2
— 180 – 260 Vac ARMB output power rating
ARM, Autoranging Rectifier Module
Rev. 3.9
Page 3 of 11
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OPERATING CHARACTERISTICS
Vdc output
Vdc output
Strap
Engaged
Enable
Enable
B OK
Enable
B OK
Figure 3
— Start-up at 120 Vac input
➞
Figure 4
— Start-up at 240 Vac input
Vdc output
Vdc output
I
ac
input @2A / mV
I
ac
input @2A / mV
Enable
Enable
B OK
B OK
Figure 5
— Power down, from 120 Vac
Figure 6
— Power down, from 240 Vac
Vdc output
Enable
B OK
Figure 7
— Output overvoltage protection 240 Vac range
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.9
Page 4 of 11
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APPLICATION NOTE
The VI-ARM Autoranging Rectifier Module (ARM) provides
an effective solution for the AC front end of a power supply
designed with Vicor DC-DC converters. This high performance
power system building block satisfies a broad spectrum of
requirements and agency standards.
The ARM contains all of the power switching and control
circuitry necessary for autoranging rectification, inrush current
limiting, and overvoltage protection. This module also provides
converter enable and status functions for orderly power
up/down control or sequencing. To complete the AC front-end
configuration, the user needs only to add holdup capacitors and
a suitable input filter with transient protection.
Functional Description
Initial Conditions.
The switch that bypasses the inrush
limiting PTC (positive temperature coefficient) thermistor is
open when power is applied, as is the switch that engages the
strap for voltage doubling. (See
Fig. 8).
In addition, the
downstream DC-DC modules are disabled via the Enable (EN)
line, and Bus-OK (B OK) is high.
Power-Up Sequence.
(See
Fig. 9).:
1.1
Upon application of input power, the output bus capacitors
begin to charge. The thermistor limits the charge current,
and the exponential time constant is determined by the
holdup capacitor value and the thermistor cold resistance.
The slope (dv/dt) of the capacitor voltage approaches zero
as the capacitors become charged to the peak of the AC
line voltage.
2.1
If the bus voltage is less than 200 V as the slope nears
zero, the voltage doubler is activated, and the bus voltage
climbs exponentially to twice the peak line voltage.
If the bus voltage is greater than 200 V, the doubler is
not activated.
If the bus voltage is greater than 235 V as the slope
approaches zero, the inrush limiting thermistor is
bypassed. Below 235 V, the thermistor is not bypassed.
The converters are enabled ~150 milliseconds after the
thermistor bypass switch is closed.
Bus-OK is asserted after an additional ~150 millisecond
delay to allow the converter outputs to settle within
specification.
3.1
4.1
5.1
Power-Down Sequence.
(See
Fig. 9).
When input power is
turned off or fails, the following sequence occurs as the bus
voltage decays:
1.2
2.2
Bus-OK is deasserted when the bus voltage falls below
205 Vdc (Typ.).
The converters are disabled when the bus voltage falls
below 200 Vdc. If power is reapplied after the converters
are disabled, the entire power-up sequence is repeated. If
a momentary power interruption occurs and power is
reestablished before the bus reaches the disable threshold,
the power-up sequence is not repeated.
Power
Up
Power
Down
+OUT
90–132 V
AC Line
400
300
200
100
0
PTC
Thermistor
L
Strap
Strap
Output
Bus
(Vdc)
Strap
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
1.1
2.1
–OUT
N
EN
Microcontroller
BOK
3.1
4.1
5.1
2.2
1.2
~150 ms
~150 ms
Figure 8
— Functional block diagram
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Figure 9
— Timing diagram: power up/down sequence
ARM, Autoranging Rectifier Module
Rev. 3.9
Page 5 of 11
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