FARM
™
FARMxxxx
Actual size:
2.28 x 2.2 x 0.5 in
57,9 x 55,9 x 12,7 mm
®
S
C
US
C
NRTL
US
Filter/Autoranging Rectifier Module Up to 1000 Watts
Features
•
•
•
•
•
•
•
•
•
•
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
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
Vac
Vac
Vdc
Vdc
Vdc
in-lbs (N-m)
°C
°C
°F (°C)
°F (°C)
A
°C
6 each, 4-40 screw
H-Grade
H-Grade
<5 sec; wave solder
<7 sec; hand solder
Notes
Continuous
100 ms
RoHS compliant (with F or G pin style)
EMI filtering
Choice of 500 W or 750 W modules
96% efficiency
Autoranging 115/230 Vac input
Microprocessor controlled
Inrush current limiting
Mini sized package
Power fail signal
Module enable
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 500/750 W or
750/1000 W 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 300 V 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.
Output current
Baseplate temperature
Thermal Resistance and Capacity
Parameter
Baseplate to sink
flat, greased surface
with thermal pad (P/N 20264)
Baseplate to ambient
Free convection
1000 LFM
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
Pin Style
1
= Short Pin
2
= Long Pin
S
= Short ModuMate
N
= Long ModuMate
F
= Short RoHS
G
= Long RoHS
[1]
[1]
[2]
[1]
[1]
1
Baseplate
1
= Slotted
2
= Threaded
3
= Thru hole
Type
1
= 500/750 W
2
= 750/1000 W
K
= Extra Long RoHS
[1]
[2]
Pin styles S, N, F & G are compatible with the ModuMate interconnect system for socketing and surface mounting
Not intended for socket or Surfmate mounting
FARM
™
Page 1 of 11
Rev 6.7
06/2015
vicorpower.com
800 927.9474
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
Vac
Vac
Vac
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
264 Vac peak line
Inrush current
OUTPUT SPECIFICATIONS
FARM1xxx
Parameter
Output power
Efficiency
Output voltage
External hold-up capacitance
1,100
Min
0
0
94
250
96
370
Typ
Max
500
750
Min
0
0
94
250
96
370
1,750
FARM2xxx
Typ
Max
750
1000
Unit
Watts
Watts
%
Vdc
µF
µF
Notes
90 – 132 Vac
180 – 264 Vac
120/240 Vac
90 – 264 Vac
2 - 3,300 µF in series; HUB3300-S
2 - 2,200 µF 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
Vdc
Vdc
Vdc
Vdc
Ω
Vdc
Vdc
Vdc
Vdc
Vdc
Notes
To negative output – Bus normal
Bus normal 50 mA max.
Bus abnormal, 27 K internal pull up to 15 Vdc (see Fig.11)
Output Bus voltage (see Fig. 8)
Output Bus voltage
To negative output – Converters disabled
50 mA max.
150 K internal pull up to 15 Vdc (see Fig. 10)
Output bus voltage (see Fig. 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 6.7
06/2015
vicorpower.com
800 927.9474
FARMxxxx
ELECTRICAL CHARACTERISTICS (CONT.)
ELECTROMAGNETIC COMPATIBILITY
Parameter
Transient / surge immunity
Line disturbance / immunity
Flicker / inrush
Standard
EN61000-4-5
EN61000-4-11
EN61000-3-3
Notes
2 kV –50 µs Line or neutral to earth
1 kV –50 µs Line to neutral
Interruptions and brownouts
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
Vdc
mA
Max
Unit
Notes
Isolation provided by DC-DC converter(s)
Baseplate earthed
264 Vac
AGENCY APPROVALS
Safety Standards
FARM1 xxx
UL60950, EN60950, CSA 60950
Agency Markings
Notes
Baseplate earthed, fast acting line fuse,
Bussman ABC10 or Wickman 10 A 194 series
Low voltage directive
Baseplate earthed, fast acting line fuse,
Bussman ABC15 or Wickman 16 A 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, 2 17 F
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 6.7
06/2015
vicorpower.com
800 927.9474
FARMxxxx
OPERATING CHARACTERISTICS
Vdc output
Vdc output
Strap
Engaged
Enable
B OK
fi
Enable
B OK
Figure 1
—
Start up at 120 Vac input
Figure 2
—
Start up at 240 Vac input
Vdc output
Vdc output
I
ac input @2 A / mV
I
ac input @2 A / mV
Enable
Enable
B OK
B OK
Figure 3
—
Power down, from 120 Vac
Figure 4
—
Power down, from 240 Vac
Vdc output
Enable
B OK
Figure 5
—
Output overvoltage protection 240 Vac range
Figure 6
—
Typical Conducted Emissions
FARM
™
Page 4 of 11
Rev 6.7
06/2015
vicorpower.com
800 927.9474
FARMxxxx
APPLICATION NOTE
The Filtered, Autoranging Rectifier Module (FARM) provides an
effective solution for the AC frontend 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 Condition
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 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.
1.2
Bus-OK is de-asserted when the bus voltage falls below
205 Vdc (Typical).
2.2
The converters are disabled when the bus voltage
falls below 190 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 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.
2.1
If the bus voltage is greater than 200 V, the doubler is
not activated.
3.1
If the bus voltage is greater than 235 V as the slope
approaches zero, the inrush limiting thermistor is
bypassed. Below 235 V, 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 Fig. 8)
When input power is
turned off or fails, the following sequence occurs as the bus
voltage decays:
Power
Up
+OUT
Power
Down
PTC
Thermistor
L
EMI
Filter
90–132 V
AC Line
Strap
Strap
400
300
200
100
0
Output
Bus
(Vdc)
–OUT
1.1
2.1
Strap
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
~150 ms
~150 ms
3.1
4.1
5.1
2.2
1.2
N
EN
Microcontroller
BOK
EMI GRD
Figure 7
—
Functional block diagram: autoranging rectifier
Figure 8
—
Timing diagram: power up/down sequence
FARM
™
Page 5 of 11
Rev 6.7
06/2015
vicorpower.com
800 927.9474
FPGA/CPLD
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