FARM™
FARMxxxx
Actual size:
2.28 x 2.2 x 0.5in
[57,9 x 55,9 x 12,7mm]
®
S
C
US
C
NRTL
US
Filter/Autoranging Rectifier Module Up to 1000 Watts
Features & Benefits
•
RoHS compliant (with F or G pin style)
•
EMI filtering
•
Choice of 500W or 750W modules
•
96% efficiency
•
Autoranging 115/230V
AC
input
•
Microprocessor controlled
•
Inrush current limiting
•
Mini sized package
•
Power fail signal
•
Module enable
Absolute Maximum Rating
Parameter
L to N voltage
+OUT to –OUT voltage
B OK to –OUT voltage
EN to –OUT voltage
Mounting torque
Operating temperature
Storage temperature
Pin soldering temperature
Output current
Baseplate temperature
Rating
264
280
400
16
16
4 – 6 [0.45 – 0.68]
–40 to 100
–55 to 125
500 [260]
750 [390]
3.5
100
Unit
V
AC
V
AC
V
DC
V
DC
V
DC
in.lbs [N.m]
°C
°C
°F [°C]
°F [°C]
A
°C
6 each, 4-40 screw
H-Grade
H-Grade
<5sec; wave solder
<7sec; hand solder
Notes
Continuous
100ms
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 0.5in.
The FARM interfaces directly with worldwide
AC mains and may be used with Vicor
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.
Vicor 2nd Generation packaging technology
offers flexible mounting options for various
manufacturing processes. The FARM may be
installed as a conventional leaded device
for onboard applications, inboard for
low-profile, height-restricted applications,
socketed or surface mounted with optional
ModuMate interconnect products.
[a]
Thermal Resistance and Capacity
Parameter
Baseplate to sink
flat, greased surface
with thermal pad (P/N 20264)
Baseplate to ambient
Free convection
1000LFM
Min
Typ
0.16
0.14
8.0
1.9
Max
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Part Numbering
FARM
Product
1
C
Product Grade Temperatures (°C)
Grade Operating
Storage
E
= –10 to +100 –20 to +125
C
= – 20 to +100 –40 to +125
T
= – 40 to +100 –40 to +125
H
= – 40 to +100 –55 to +125
1
=
2
=
S
=
N
=
F
=
G
=
K
=
1
Pin Style
Short Pin
Long Pin
[a]
Short ModuMate
[a]
Long ModuMate
[a]
Short RoHS
[a]
Long RoHS
[b]
Extra Long RoHS
1
Baseplate
1
= Slotted
2
= Threaded
3
= Thru hole
Type
1
= 500/750W
2
= 750/1000W
Pin styles S, N, F & G are compatible with the ModuMate interconnect system for socketing
and surface mounting.
[b]
Not intended for socket or Surfmate mounting.
Note:
Product images may not highlight current product markings.
FARM™
Page 1 of 11
Rev 7.0
06/2019
FARMxxxx
Electrical Characteristics
Electrical characteristics apply over the full operating range of input voltage, output power 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 (Farm1xxx, Farm2xxx)
Parameter
Operating input voltage
low range
high range
Input undervoltage
AC line frequency
Power factor
47
47
0.60
Min
90
180
Typ
Max
132
264
90
63
880
Unit
V
AC
V
AC
V
AC
Hz
Hz
Notes
Autoranging (doubler mode)
Autoranging (bridge mode)
No damage
C-Grade
T-Grade, H-Grade
Dependent on line source impedance, hold-up
capacitance and load.
30
Amps
264V
AC
peak line
Inrush current
Output Specifications
FARM1xxx
Parameter
Output power
Efficiency
Output voltage
External hold-up capacitance
Min
0
0
94
250
96
370
Typ
Max
500
750
Min
0
0
94
250
96
370
1,750
1,100
FARM2xxx
Typ
Max
750
1000
Unit
Watts
Watts
%
V
DC
µF
µF
Notes
90 – 132V
AC
180 – 264V
AC
120/240V
AC
90 – 264V
AC
2 – 3,300µF in series; HUB3300-S
2 – 2,200µF in series; HUB2200-S
Control Pin Specifications
Parameter
AC Bus OK (B OK)
Low-state resistance
Low-state voltage
High-state voltage
B OK true threshold
B OK false threshold
Module Enable (EN)
Low-state resistance
Low-state voltage
High-state voltage
Enable threshold
Disable threshold
AC Bus OK - Module Enable,
differential error*
Min
Typ
Max
15
0.1
15.4
245
210
15
0.1
16
245
195
16
Unit
Ω
V
DC
V
DC
V
DC
V
DC
Ω
V
DC
V
DC
V
DC
V
DC
V
DC
Notes
To negative output – Bus normal
Bus normal 50mA max.
Bus abnormal, 27kΩ internal pull up to 15V
DC
(see Figure11)
Output Bus voltage (see Figure 8)
Output Bus voltage
To negative output – Converters disabled
50mA max.
150kΩ internal pull up to 15V
DC
(see Figure 10)
Output bus voltage (see Figure 8)
Output bus voltage
AC Bus OK and Module Enable thresholds track
14.0
235
200
15.0
240
205
12
235
185
12
14
240
190
14
* Tracking error between Bus OK and Enable thresholds
FARM™
Page 2 of 11
Rev 7.0
06/2019
FARMxxxx
Electrical Characteristics (Cont.)
Electrical characteristics apply over the full operating range of input voltage, output power 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.
Electromagnetic Compatibility
Parameter
Standard
EN61000-4-5
EN61000-4-11
EN61000-3-3
Notes
2kV–50µs Line or neutral to earth
1kV–50µs Line to neutral
Interruptions and brownouts
T
ransient / surge immunity
Line disturbance / immunity
Flicker / inrush
Safety Specifications (Farm1xxx, Farm2xxx)
Parameter
Isolation voltage (IN to OUT)
Dielectric withstand
(I/O to baseplate)
Leakage current
2,121
1.5
Min
Typ
None
V
DC
mA
Max
Unit
Notes
Isolation provided by DC-DC converter(s)
Baseplate earthed
264 V
AC
Agency Approvals
Safety Standards
FARM1 xxx
UL60950, EN60950, CSA 60950
Agency Markings
Notes
Baseplate earthed, fast-acting line fuse,
Bussman ABC10 or Wickman 10A 194 series
Low voltage directive
Baseplate earthed, fast-acting line fuse,
Bussman ABC15 or Wickman 16A 194 Series
Low voltage directive
cTÜVus
CE Marked
FARM2 xxx
UL60950, EN60950, CSA 60950
cTÜVus
CE Marked
General Specifications
Parameter
MTBF
Baseplate material
Cover
Pin Material
Style 1 & 2
Styles S & N (ModuMate compatible)
Styles F & G (RoHS compliant)
Weight
Size
3.1
[88]
2.28 x 2.2 x 0.5
[57,9 x 55,9 x 12,7]
Ounces
[grams]
Inches
[mm]
Min
Typ
>1,000,000
Max
Unit
Hours
Notes
25˚C, Ground Benign, MIL-HDBK-217F
Aluminum
Ends: Zenite® 6130
Center section: Kapton insulated aluminum
Copper, Tin / Lead plated
Copper, Nickel / Gold plated
Copper, Nickel / Gold plated
FARM™
Page 3 of 11
Rev 7.0
06/2019
FARMxxxx
Operating Characteristics
V
DC
output
V
DC
output
Strap
Engaged
Enable
B OK
➞
Enable
B OK
Figure 1 —
Start up at 120V
AC
input
Figure 2 —
Start up at 240V
AC
input
V
DC
output
V
DC
output
I
AC
input @2A / mV
I
AC
input @2 A / mV
Enable
B OK
Enable
B OK
Figure 3 —
Power down, from 120V
AC
Figure 4 —
Power down, from 240V
AC
V
DC
output
Enable
B OK
Figure 5 —
Output overvoltage protection 240V
AC
range
Figure 6 —
Typical conducted emissions
FARM™
Page 4 of 11
Rev 7.0
06/2019
FARMxxxx
Application Note
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
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 Figure 7). In addition, the converter modules are
disabled via the Enable (EN) line, and Bus OK (BOK) is high.
Power-Up Sequence (See Figure 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.
Power
Up
+OUT
2.1.
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 ~150 milliseconds
after the thermistor bypass switch is closed.
5.1.
Bus OK is asserted after an additional ~150 millisecond delay to
allow the converter outputs to settle within specification.
Power-Down Sequence:
(See Figure 8). When input power
is turned off or fails, the following sequence occurs as the bus
voltage decays:
1.2.
Bus OK is de-asserted when the bus voltage falls below
205V
DC
(typical).
2.2.
The converters are disabled when the bus voltage falls below
190V
DC
. 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 re-established 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.
Power
Down
L
EMI
Filter
PTC
Thermistor
90 – 132V
AC Line
Strap
Strap
400
300
200
100
0
Output
Bus
(V
DC
)
–OUT
1.1
2.1
N
EN
Microcontroller
BOK
Strap
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
3.1
~150ms
~150ms
4.1
5.1
1.2
2.2
EMI GRD
Figure 7 —
Functional block diagram: autoranging rectifier
Figure 8 —
Timing diagram: power up/down sequence
Timing Diagram, Power Up/Down Sequence
FARM™
Page 5 of 11
Rev 7.0
06/2019
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