F & FC Series DC-DC Converter Input Filters
Introduction
Power-One offers a complete range of input filters to
help control EMI in board-level dc-dc converter
applications. The table below lists combinations of
input filters and dc-dc converters that have test data
available. These test results are presented only to
provide general guidelines, as EMI issues vary
considerably based on many variables specific to
each application.
Due to the large number of possible permutations of
dc-dc converters and input filters, not all
combinations have been tested. Therefore, please
refer to the data presented for each filter to select
filters that may work in combinations not specified
below.
DC-DC
Converter
Series
FES
HBD
HES
IAD
IAS
IES
LES
OET
Q24
Q48
QBS
QD48
QES
QL48
QM48
QME48
SQ24
SQ48
SQE48
SQM48
SQT48
Tested with
Filter Model
Numbers
FC100V20A
FC100V5A
FC100V5A
FC100V5A
FC100V5A
FC100V5A
FC100V5A
FC100V5A
F4804A, F2410,
F4810
F4804A, F4810
FC100V5A
F4804A, F4810
FC100V5A
F4804A, F4810
F4810
F4810
F4804A, F2410,
F4810
F4804A, F4810
F4804A, F4810
F4804A, F4810
F4810
Filter
Series
FC
FC
FC
FC
FC
FC
FC
FC
F
F
FC
F
FC
F
F
F
F
F
F
F
F
Detailed Table of Contents
F4804A, 0-80V, 4 Amps, SMT Mount
...................2
Features...............................................................2
Description...........................................................2
Electrical Specifications.......................................3
Physical Information ............................................7
Filter Part Numbering Ordering Information ........7
F2410 & F4810, 0-45V/0-80V, 10 Amps,
SMT Mount
.............................................................8
Features...............................................................8
Description...........................................................8
Electrical Specifications.......................................9
Thermal Considerations ....................................11
Physical Information ..........................................13
Filter Part Numbering Ordering Information ......13
FC Series, 0-100V, 5/10/20 Amps, TH Mount
....14
Model Selection.....................................................15
FC Model Numbering Convention.........................15
Design Considerations ..........................................16
DC Current Ratings ...........................................17
Safety Considerations ...........................................17
Isolation .............................................................17
Fusing ................................................................17
Case Grounding ................................................17
Input Shutdown Pin ...............................................17
Reflected Input Current .........................................18
FC100V5A Module Details....................................18
FC100V10A Module Details..................................21
FC100V20A Module Details..................................24
EMI Measurement Methodology ...........................24
Printed Circuit Board Design.................................29
Manufacturing Issues ............................................29
Processing of Completed Power Modules ........29
Notes on Processing of Completed Power
Modules .............................................................29
Mechanical Drawings ............................................30
FC Filters Ordering Information.............................31
F4804, Not for New Designs...............................32
Features.............................................................32
Description.........................................................32
Electrical Specifications.....................................33
Physical Information ..........................................41
Filter Part Numbering Ordering Information ......41
Page
14
14
14
14
14
14
14
14
2, 8
2, 8
14
2, 8
14
2, 8
8
8
2, 8
2, 8
2, 8
2, 8
8
MCD10059 Rev. 1.0
Page 1 of 41
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F & FC Series DC-DC Converter Input Filters
F4804A, 0-80V, 4 Amps, SMT Mount
Features
•
RoHS lead free solder and lead solder exempted
products are available
•
Maximum current 4 A with no derating
•
Maximum operating input voltage 80 V
•
100 V 100 ms transient withstand capability
•
Differential LC-filter stage
•
Surface mounted design
•
Small footprint – only 0.75 sq. in.
•
Low profile: 0.267” [6.78 mm] maximum
•
Low weight: 0.13 oz [3.66 g]
•
Operation over -40 °C to 85 °C ambient
temperature range
•
No airflow required up to 85 °C
•
Enables dc-dc converter compliance with
EN55022 and FCC Class B requirements
conducted emissions
•
UL60950 recognition in U.S. & Canada, and
DEMKO certification per IEC/EN60950
F4804A Applications
Differential and Common Mode filtering for dc-dc
converters:
•
Telecommunications
•
Data communications
•
Distributed Power Solutions
Description
The F4804A Input Filter minimizes the conducted and radiated emissions generated by switch mode dc-dc
converters, and allows board designs utilizing dc-dc converters to meet stringent FCC and EN55022 Class B
conducted emissions requirements. Filter F4804A is a fully compatible replacement for F4804, with improved
electrical and thermal characteristics.
Unlike most available off-the-shelf filter modules, the F4804A, in addition to common mode noise reduction
components, is provisioned with a differential LC-filter stage, which virtually guarantees compliance with
conducted noise standards across the frequency range from 150 kHz to 30 MHz, including fundamental switching
frequency and its harmonics. Test results show headroom of 15-20 dB for conducted noise quasi-peak levels, in
relation to Class B requirements.
F4804A filter is designed specifically for distributed power solutions in conjunction with dc-dc converters. Low
profile and small size (only 0.75 sq. in.) in a surface mount package helps the designer save system board real
estate, and simplifies the layout.
A single filter can be used with multiple converters, and is capable of providing up to 4 A to the converter input bus
at 85 °C. When used as specified within this data sheet, these filters do not require airflow and/or derating at high
temperatures.
.
MCD10059 Rev. 1.0
Page 2 of 41
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F & FC Series DC-DC Converter Input Filters
F4804A, 0-80V, 4 Amps, SMT Mount
Electrical Specifications
Conditions: T
A
= 25 ºC, No Airflow, Vin = 48 VDC, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Storage Temperature
Electrical Characteristics
Operating Input Voltage Range
Maximum Operating Current
DC Resistance (total for two legs)
Filter differential inductance
Filter common mode inductance
Differential mode Attenuation at 400 kHz
Differential mode attenuation at 30 MHz
Common mode Attenuation at 400 kHz
Common mode Attenuation at 30 MHz
Efficiency at Maximum Load
Additional Notes:
1.
2.
2
2
1
1
Notes
Continuous
Min
0
-40
-55
0
Typ
Max
100
85
125
Units
VDC
°C
°C
VDC
ADC
Ω
µH
µH
dB
dB
dB
dB
%
48
0.07
5
80
4
85
°C
ambient, no airflow
For frequencies below 10 MHz
60
35
56
50
60
Vin = 48V @ 4 A
99.2
99.4
50
Ω
source and 50
Ω
load impedance. See Fig 2 for differential mode attenuation in 50 kHz-100 MHz frequency range.
50
Ω
source and 50
Ω
load impedance; external common-mode capacitors 0.47 µF (from IN+ and IN- to the common chassis).
See Fig. 3 and Fig. 4 for attenuation in 50 kHz-100 MHz frequency range.
MCD10059 Rev. 1.0
Page 3 of 41
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F & FC Series DC-DC Converter Input Filters
F4804A, 0-80V, 4 Amps, SMT Mount
The F4804A filter contains input and output
capacitors, plus differential and common mode
inductors. The separate differential inductor, L2,
allows a differential attenuation of 55 dB, a value
substantially higher in comparison with other
available off-the-shelf filters (typically 25-30 dB).
Absolute maximum voltage and maximum operating
voltage in Electrical Specifications Table are for the
filter itself; check maximum rating for corresponding
dc-dc converters. Filter will not be damaged by
reversed input voltage, or by applying voltage to the
output pins.
L1-1
2 x 30
μH
L2
4.7
μH
Fig. 3 and Fig. 4 show Common mode attenuation with
50
Ω
source and load. The attenuation depends on the
value of external Y-capacitors, connected between input
pins and frame or a reference ground.
Vin+
Vout+
C1
2
μF
Vin-
L1-2
C2
1
μF
C3
2
μF
Vout-
Fig. 1: Schematic diagram.
Fig. 3: Common Mode attenuation, 0.05-100 MHz. Source and
load resistances are 50
Ω.
Two 0.1 µF Y-caps to common
line. Vertical scale: 20 dB/div, with zero dB level marked by
arrow.
Differential attenuation plot in the frequency range of
50 kHz-100 MHz is shown in Fig. 2, and can be seen
to be flat (around 55-60 dB) from 0.5 MHz to
50 MHz.
Fig. 2: Differential mode attenuation, 0.05-100 MHz. Source
and load resistances are 50
Ω.
Vertical scale: 20 dB/div, with
zero level marked by arrow. No load @ 25 ºC.
Fig. 4: Common Mode attenuation, 0.05-100 MHz. Source and
load resistances are 50
Ω.
Two 0.47 µF Y-caps to common
line. Vertical scale: 20 dB/div, with zero dB level marked by
arrow.
MCD10059 Rev. 1.0
Page 4 of 41
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F & FC Series DC-DC Converter Input Filters
F4804A, 0-80V, 4 Amps, SMT Mount
Thermal Considerations
Because of low series internal DC resistance, the
F4804A filter generally does not require airflow
and/or derating to ambient temperatures up to 85
˚C,
if placed and interconnected as described below.
Good thermal design includes the appropriate
placement of the filter on the system board as to
maximize heat exchange through the power pins.
For high temperature operation in low airflow
environments, use of 1-2 oz copper for the external
connection pads and provision for some extra copper
at all four I/O pins is encouraged. Good thermal
connection to the power planes is important.
To check filter thermal characteristic in an actual
system environment, attach a thermocouple to the
top of each inductor.
The maximum temperature at these test points
should not exceed 120
˚C.
A typical application schematic is shown in Fig. 5.
The filter can be used to power one or more
converters.
For applications requiring filter current greater than
4 A divide the converters into smaller groups and
use multiple filters or use a F4810 or F2410 filter
which is capable of providing up to 10 A. Do not
connect filters in parallel.
C4
Vin+
CY1
F4804A
Input Filter
(Top View)
Vin (+)
+
DC-DC
Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
C8
Rload1
C1
C2
ON/OFF
Vin-
F1
5A
CY2
Vin (-)
Vout (-)
C5
C6
Vin (+)
C3
ON/OFF
DC-DC
Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
C9
Rload2
Vin (-)
Vout (-)
C7
Fig. 5: F4804A - Typical application
MCD10059 Rev. 1.0
Page 5 of 41
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