> AC Bus OK, module enable
Inrush limiting (no external circuitry)
CE Marked
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.
Actual size:
2.28 x 1.45 x 0.5 in
57,9 x 36,8 x 12,7 mm
Parameter
Rating
Unit
Notes
L to N
264
Vac
280
Vac
100 ms
+ Out to Out
400
Vdc
B OK to Out
16
Vdc
EN to Out
16 Vdc
Output power
VI-ARM 500/750
Watts
115/230 V
VI-ARMB
750/1500
Watts
115/230 V
See page 3 for derating
Mounting torque
4 6 (0.45 0.68)
in-lbs (N-m)
6 each, 4-40 screw
Operating temperature
55 to +100
°C
M-Grade
Storage temperature
65 to +125
°C
M-Grade
Pin soldering temperature
500 (260)
°F (°C)
< 5 sec; wave solder
750 (390)
°F (°C)
< 7 sec; hand solder
Product
Type*
1 = 500/750 W
2 = 750/1500 W
Pin Style**
1 = Short
2 = Long
S = Short Modumate
N = Long Modumate
F = Short RoHS
G = Long RoHS
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
Absolute Maximum Ratings
Part Numbering
*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.
Parameter
Min
Typ
Max
Unit
Baseplate to sink
flat, greased surface
0.24
°C/Watt
with thermal pad (P/N 16495)
0.3
°C/Watt
Baseplate to ambient
free convection
15
°C/Watt
1000 LFM
2.7
°C/Watt
Thermal capacity
48
Watt-sec/°C
Thermal Resistance Capacity
VI-ARM
-
C
1
2 Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.6
Page 2 of 11
Set your site on VICOR at www.vicorpower.com
VI-ARM - 1
VI-ARMB - 2
Parameter
Min
Typ
Max
Min
Typ
Max
Unit
Notes
Output power
0
500
0
750
Watts
105 132 Vac (Fig. 1)
0
750
0
1500
Watts
210 264 Vac (Fig. 2)
Efficiency
120 Vac
94
96
94
96
%
240 Vac
96
98
96
98
%
Output voltage
200
375
200
375
Vdc
90 264 Vac
VI-ARM - 1
VI-ARMB - 2
Parameter
Min
Typ
Max
Min
Typ
Max
Unit
Notes
Operating input voltage
90
132
90
132
Vac
Autoranging (doubler mode)
180
264
180
264
Vac
Autoranging (bridge mode)
Input undervoltage
90
90
Vac
No damage
Input surge withstand
280
280
Vac
100 ms
AC line frequency
47
63
47
63
Hz
C-Grade
47
880
47
880
Hz
T, H & M-Grade
Input current, rms
0
7.4
0
11.1 Amps
120
Vac
0
5.4
0
7.2
Amps
240 Vac
Power factor
0.60
0.60
Typical line voltage
condition
Inrush current
30
30
Amps
264 Vac peak line,
cold start
Holdup capacitance
1600
2400
µF
OUTPUT SPECIFICATIONS
INPUT SPECIFICATIONS
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.
CONTROL PIN SPECIFICATIONS
Parameter
Min
Typ
Max
Unit
Notes
AC Bus OK (B OK)
On-state resistance (low)
15 To negative output - bus normal
On-state current (low)
- 50
mA
Bus normal
Off-state voltage
14.8
15.0
15.2
Vdc
Bus abnormal, 27 K internal pull up to 15 Vdc (Fig. 12)
On-state threshold
235
240
245
Vdc
Output bus voltage
Off-state threshold
200
205
210
Vdc
Output bus voltage
Module Enable (EN)
On-state resistance (low)
15 To negative output - converters are disabled
On-state current (low)
50
mA
Off-state voltage
14.8
15.0
15.2
Vdc
150 K internal pull up to 15 Vdc (Fig. 11)
On-state threshold
235
240
245
Vdc
Output bus voltage
Off-state threshold
185
190
195
Vdc
Output bus voltage
Over voltage shutdown
380
390
400
Vdc
AC Bus OK - module enable,
15
17
20
Vdc
AC Bus OK and module enable thresholds track
differential error*
*
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. 3.6
Page 3 of 11
Set your site on VICOR at www.vicorpower.com
ELECTRICAL CHARACTERISTICS (CONT.)
GENERAL SPECIFICATIONS
Parameter
Min
Typ
Max
Unit
Notes
MTBF
>1,000,000
hours
25C, ground benign
Baseplate material
Aluminum
Cover
Kapton insulated aluminum, plastic molded terminal blocks
Pin material
Copper, tin/lead solder dipped (solder pins)
Gold plated nickel copper (Modumate and RoHS)
Weight
1.6 (45)
ounces (grams)
Size
2.28 x 1.45 x 0.5
inches
(57,9 x 36,8 x 12,7)
(mm)
SAFETY SPECIFICATIONS
Parameter
Min
Typ
Max
Unit
Notes
Isolation voltage (in to out)
None
Isolation provided by DC-DC converter(s)
Dielectric withstand
1,500
V
RMS
(I/O to baseplate)
Leakage current
100
µA
No filter
AGENCY APPROVALS
Safety Standards
Markings
Notes
UL 60950, EN 60950, CSA 60950
cULus, cTÜVus,
CE Marked
Low Voltage Directive
630
640
650
660
670
680
690
700
710
720
730
740
750
760
90
95
100
105
110
115
120
125
130
Input Voltage (AC)
Output P
o
wer (W
att
s
)
Figure 1 90 130 Vac ARMB output power rating
1260
1280
1300
1320
1340
1360
1380
1400
1420
1440
1460
1480
1500
1520
180
190
200
210
220
230
240
250
260
Input Voltage (AC)
Output P
o
wer (W
att
s
)
Figure 2 180 260 Vac ARMB output power rating
VI-ARMB DERATING Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.6
Page 4 of 11
Set your site on VICOR at www.vicorpower.com
OPERATING CHARACTERISTICS
Figure 3 Start-up at 120 Vac input
Figure 5 Power down, from 120 Vac
Figure 6 Power down, from 240 Vac
Figure 4 Start-up at 240 Vac input
Vdc output
Strap
Engaged
I
ac input @2A / mV
I
ac input @2A / mV
Enable
Enable
B OK
Vdc output
Enable
B OK
Vdc output
Enable
B OK
Vdc output
Enable
B OK
Figure 7 Output overvoltage protection 240 Vac range
Vdc output
Enable
B OK
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.6
Page 5 of 11
Set your site on VICOR at www.vicorpower.com
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).:
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.
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 50 milliseconds after the
thermistor bypass switch is closed.
Bus-OK is asserted after an additional 50 millisecond
delay to allow the converter outputs to settle within
specification.
Power-Down Sequence.
(See Fig. 9). When input power is
turned off or fails, the following sequence occurs as the bus
voltage decays:
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.
APPLICATION NOTE
Microcontroller
N
L
PTC
Thermistor
+OUT
OUT
Strap
EN
BOK
Strap
EMI
Filter
400
300
200
100
0
90132 V
AC Line
Output
Bus
(Vdc)
Strap
PTC
Th