45
Features
•
Autoranging input
•
Microprocessor controlled
•
VI-ARM-1
500 Watts @ 90-132Vac
750 Watts @ 180-264Vac
•
VI-ARM-2
1000 Watts @ 90-132Vac
1500 Watts @ 180-264Vac
•
96-98% Efficiency
•
100˚C baseplate (no derating)
•
UL, CSA, TÜV, VDE, BABT
•
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.
VI-ARM
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
Rating
VI-ARM-1/VI-ARM-2
Unit
L to N
264
Vac
L to N
280
Vac
+Out to –Out
400
Vdc
B OK to –Out
16
Vdc
EN to –Out
16
Vdc
Output power
500/1000
Watts
750/1500
Watts
Mounting torque
4 - 6 (0.45 - 0.68)
in- lbs (N-m)
Pin soldering temperature
500 (260)
°F (°C)
Pin soldering temperature
750 (390)
°F (°C)
Storage temperature, C–,& T– Grade –40 to +125
°C
Operating temperature, C– Grade
–20 to +100
°C
Operating temperature, T– Grade
–40 to +100
°C
Notes
100ms
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 500/750W or 750/1000W models in a
mini sized 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 1st or 2nd Generation 300V 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 2nd Generation 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.
90-132Vac
180-264Vac
6 each, 4-40 screw
<5 sec; wave solder
<7 sec; hand solder
Baseplate
Baseplate
Baseplate
Thermal Resistance and Capacity
Parameter
Baseplate to sink; flat, greased surface
Baseplate to sink; with thermal pad (P/N 16495)
Baseplate to ambient- free convection
Baseplate to ambient; 1000 LFM- forced air
Thermal capacity
Typ
0.24
0.3
15
2.7
48
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Watt-sec/°C
Part Numbering
VI-ARM-
Product
C
1
Type
1 = 500/1000W
2 = 750/1500W
2
Pin Style*
1 = Short
2 = Long
S=Short Modumate
N=Long Modumate
Product Grade
C = –20°C to +100°C
T = –40°C to +100°C
H = –40°C to +100°C
M = –55°C to +100°C
*Pin styles S & N 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. 2.4
Page 1 of 12
Set your site on VICOR at www.vicorpower.com
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.
MODULE INPUT SPECIFICATIONS
VI-ARM - 1
Parameter
Operating input voltage
Operating input voltage
Input undervoltage
Input surge withstand
AC line frequency
AC line frequency
Input current, rms
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
60
3300
Amps
µF
VI-ARM - 2
Min
90
180
Typ Max
132
264
90
280
63
880
14.8
10.8
Unit
Vac
Vac
Vac
Vac
Hz
Hz
Amps
Amps
Notes
Autoranging (doubler mode)
Autoranging (bridge mode)
No damage
100ms
C-Grade
T-Grade
120Vac
240Vac
Typical line voltage condition
264Vac peak line, cold start
MODULE OUTPUT SPECIFICATIONS
VI-ARM - 1
Parameter
Output power
Output power
Efficiency, 120Vac
Efficiency, 240Vac
Output voltage
Min
0
0
94
96
200
96
98
375
Typ Max
500
750
VI-ARM - 2
Min
0
0
94
96
200
96
98
375
Typ Max
1000
1500
Unit
Watts
Watts
%
%
Vdc
90-264Vac
Notes
90-132Vac
180-264Vac
SAFETY SPECIFICATIONS
Parameter
Agency approvals
Isolation voltage (in to out)
Isolation voltage (I/O to baseplate)
Leakage current
Min
Typ
Max
Unit
Notes
UL 1950, CSA 22.2 No. 950,
TÜV, VDE, EN60950, CE Marked
None
1500
100
Volts, rms
µA
Isolation provided by DC-DC converter(s)
No filter
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 2.4
Page 2 of 12
Set your site on VICOR at www.vicorpower.com
Electrical Characteristics, continued
MODULE CONTROL 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
Unit
Ω
mA
Vdc
Vdc
Vdc
Notes
To negative output - bus normal
Bus normal
Bus abnormal, 27K internal pull up to 15Vdc (Fig. 10)
Output bus voltage
Output bus voltage
14.8
235
200
15.0
240
205
15.2
245
210
15
50
14.8
235
200
380
15
15.0
240
205
390
17
15.2
245
210
400
20
Ω
mA
Vdc
Vdc
Vdc
Vdc
Vdc
To negative output - converters are disabled
150K internal pull up to 15Vdc (Fig. 9)
Output bus voltage
Output bus voltage
AC Bus OK and module enable thresholds track
* Tracking error between BUS OK and Enable thresholds
MODULE GENERAL SPECIFICATIONS
Parameter
MTBF
Baseplate material
Cover
Pin material
Weight
Size
Min
Typ
>1,000,000
Max
Unit
hours
Notes
25˚C, ground benign
Aluminum
Polyetherimide
Copper, tin/lead solder dipped
2.1 (60)
2.28 x 1.45 x 0.5
(57,9 x 36,8 x 12,7)
ounces (grams)
inches
(mm)
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 2.4
Page 3 of 12
Set your site on VICOR at www.vicorpower.com
Operating Characteristics
Vdc output
Vdc output
Strap
Engaged
Enable
Enable
B OK
Enable
B OK
➞
Figure 1—Start-up
at 120Vac input
Figure 2—Start-up
at 240Vac input
Vdc output
Vdc output
I
ac input @2A / mV
I
ac input @2A / mV
Enable
Enable
B OK
B OK
Figure 3—Power
down, from 120Vac
Figure 4—Power
down, from 240Vac
Vdc output
Enable
B OK
Figure 5—Output
overvoltage protection 240Vac range
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 2.4
Page 4 of 12
Set your site on VICOR at www.vicorpower.com
Application Note
The VI-ARM Autoranging Rectifier Module (ARM) provides
an effective solution for the AC front end of a power supply
built 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
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. 6).
In addition, the converter modules are
disabled via the Enable (EN) line, and Bus-OK (B OK) is high.
Power-Up Sequence.
(See
Fig. 7).:
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.
2.2
2.1
If the bus voltage is less than 200V 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 200V, the doubler is
not activated.
If the bus voltage is greater than 235V as the slope
approaches zero, the inrush limiting thermistor is
bypassed. Below 235V, 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.
3.1
4.1
5.1
Power-Down Sequence.
(See
Fig. 7).
When input power is
turned off or fails, the following sequence occurs as the bus
voltage decays:
1.2
Bus-OK is deasserted when the bus voltage falls below
205Vdc (Typ.).
The converters are disabled when the bus voltage falls
below 200Vdc. 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.
+Out
90–132V
AC Line
Strap
Strap
Output
Bus
(Vdc)
–Out
N
EN
Microcontroller
BOK
Strap
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
Power
Up
Power
Down
PTC
Thermistor
L
400
300
200
100
0
1.1
2.1
3.
1
4.1
5.
1
2.2
1.2
50ms
50ms
Figure 6—Functional
block diagram
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Figure 7—Timing
diagram: power up/down sequence
ARM, Autoranging Rectifier Module
Rev. 2.4
Page 5 of 12
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