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PDF FARM1T23 Data sheet ( Hoja de datos )

Número de pieza FARM1T23
Descripción FARM Filter/ Autoranging Rectifier Module
Fabricantes Vicor Corporation 
Logotipo Vicor Corporation Logotipo



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45
Features
EMI filtering
Choice of 500W or 750W modules
96% Efficiency
Autoranging 115/230Vac input
Microprocessor controlled
Inrush current limiting
Mini sized package
Power fail signal
Module enable
PRELIMINARY
Data Sheet
FARMTM
Filter/
Autoranging Rectifier Module
Up to 1000 Watts
Shown actual size:
2.28 x 2.2 x 0.5 in
57,9 x 55,9 x 12,7 mm
Product Highlights
The FARM (Filter/Autoranging Rectifier
Module) is an AC front-end module which
provides EMI filtering, autoranging line
rectification and inrush current limiting. The
FARM is available in either 500/750W or
750/1000W models in a mini sized package
measuring only 2.28" x 2.2" x 0.5".
The FARM 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 FARM 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.
Absolute Maximum Rating
Parameter
L to N voltage
L to N voltage
+Out to –Out voltage
B OK to –Out voltage
EN to –Out voltage
Mounting torque
Pin soldering temperature
Pin soldering temperature
Rating
264
280
400
16
16
4-6(0.45 -0.68)
500 (260)
750 (390)
Thermal Resistance and Capacity
Parameter
Baseplate to sink; flat, greased surface
Baseplate to sink; with thermal pad (P/N 20264)
Baseplate to ambient
Baseplate to ambient; 1000 LFM
Min
Unit
Vac
Vac
Vdc
Vdc
Vdc
in-lbs (N-m)
°F (°C)
°F (°C)
Notes
Continuous
100ms
6 each, 4-40 screw
<5 sec; wave solder
<7 sec; hand solder
Typ Max
Unit
0.16 °C/Watt
0.14 °C/Watt
8.0 °C/Watt
1.9 °C/Watt
Vicor 2nd Generation packaging technology
offers flexible mounting options for various
manufacturing processes. The FARM 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.
Part Numbering
FARM 1
Product
Type
1 = 500/750W
2 = 750/1000W
C
Product Grade
C = –20°C to +100°C
T = –40°C to +100°C
1
Pin Style*
1= Short Pin
2= Long Pin
S= Short ModuMate
N= Long ModuMate
1
Baseplate
1 = Slotted
2 = Threaded
3 = Thru-hole
*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
FARM, Filter/Autoranging Rectifier Module
Set your site on VICOR at www.vicorpower.com
Rev. 4.7
Page 1 of 12

1 page




FARM1T23 pdf
Application Note
PRELIMINARY
The Filtered, Autoranging Rectifier Module (FARM) 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.
In addition to providing transient/surge immunity and EMI
filtering, the FARM 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 only needs to add hold-up capacitors, and
a few discrete components.
Functional Description
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.
3.1 If the bus voltage is greater than 235V as the slope
approaches zero, the inrush limiting thermistor is
bypassed. Below 235V, it is not bypassed.
4.1 The converters are enabled 50 milliseconds after the
thermistor bypass switch is closed.
5.1 Bus-OK is asserted after an additional 50 millisecond
delay to allow the converter outputs to settle within
specification.
Power-Up Sequence. (see Fig. 8):
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
hold-up capacitor value and the thermistor cold resistance.
The slope (dv/dt) of the capacitor voltage versus time
approaches zero as the capacitors become charged to the
peak of the AC line voltage.
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. 7). In addition, the converter modules
are disabled via the Enable (EN) line, and Bus-OK (BOK)
is high.
Power-Down Sequence. (see Fig. 8) 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
210Vdc.
2.2 The converters are disabled when the bus voltage falls
below 190Vdc. 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, i.e., the power
conversion system “rides through” the momentary
interruption.
PTC
Thermistor
L
Strap
+Out
Strap
N
Microcontroller
–Out
EN
BOK
Figure 7—Functional block diagram: autoranging rectifier
Power
Up
90–132V
AC Line
Output
Bus
(Vdc)
400
300
200
100
0 1.1
Strap
2.1
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
3.1
50ms
4.1
50ms
5.1
Power
Down
2.2
1.2
Figure 8—Timing diagram: power up/down sequence
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
FARM, Filter/Autoranging Rectifier Module
Set your site on VICOR at www.vicorpower.com
Rev. 4.7
Page 5 of 12

5 Page





FARM1T23 arduino
Notes
PRELIMINARY
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
FARM, Filter/Autoranging Rectifier Module
Set your site on VICOR at www.vicorpower.com
Rev. 4.7
Page 11 of 12

11 Page







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