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Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
+25°C, 20lfm (natural convection).
+60°C, 20lfm air flow (natural convection).
absolute Maximum Ratings
input Voltage Range
100 Volts
isolation Voltage input to GND
1500Vdc minimum
isolation Voltage output to GND
1500Vdc minimum
operating Case Temperature
–40 to +100°C
Storage Temperature
–55 to +125°C
T e C h N i C a L
N o T e S
input
input Voltage Range:
100 Volts maximum
average Current @ +25°C:
FLT-100V10
10 Amps maximum
FLT-100V20
20 Amps maximum
average Current @ +60°C:
FLT-100V10
10 Amps maximum
FLT-100V20
20 Amps maximum
Resistance Per Leg:
FLT-100V10:
@ 25°C
9.5m
@ –40°C
7.6m
@ +125°C
11.8m
FLT-100V20:
@ 25°C
4.8m
@ –40°C
4m
@ +125°C
6.3m
isolation Voltage input to GND
1500Vdc minimum
isolation Voltage output to GND
1500Vdc minimum
Dynamic Characteristics
Differential-Mode insertion Loss
See Ordering Guide
Common-Mode insertion Loss
See Ordering Guide
environmental
operating Case Temperature
–40 to +100°C
MTBF @ 100°C Case
FLT-100V10
2,856,374 hours
FLT-100V20
2,521,681 hours
Storage Temperature
–55 to +125°C
Physical
Case Material
Plastic, UL 94V-0 rating
Case Dimensions:
FLT-100V10
1" x 2" x 0.5" (25.4 x 50.8 x 12.7mm)
FLT-100V20
1.6" x 2" x 0.5" (40.6 x 50.8 x 12.7mm)
Pin Material
Brass, solder coated
Pin Diameter:
FLT-100V10
0.031" (0.787mm)
FLT-100v20
0.040" (1.016mm)
Pin Length
See Part Number Structure
Weight:
FLT-100V10
1.28 ounces (36.3 grams)
FLT-100V20
2.16 ounces (61.2 grams)
Lead Temperature
Soldering, 10 seconds
+300°C
Description
The FLT-100V series of passive filters are optimized to reduce both common-
mode and differential-mode noise on both input and output lines of switching
DC/DC converters. The FLT-100V10 is rated for 10A of continuous current while
the FLT-100V20 is rated for 20A.
Differential-mode and Common-mode Noise
Designers who are faced with reducing conducted emissions in DC/DC
applications must address both differential-mode and common-mode noise.
Differences measured between the two input lines of the DC/DC converter are
classified as differential noise. The dominant contribution to differential noise is
the switching action of the DC/DC converter. Consequently, the majority of noise
will be seen at the converter’s switching frequency and it’s harmonics. The
FLT-100V series filter uses a mylar, self healing, 100Vdc rated input capacitor
connected between the two input lines (traditionally referred to as “X” capaci-
tors), in conjunction with the leakage inductance of the common mode chokes to
attenuate the low-frequency differential noise. In addition to the filter, a low-ESR
input capacitor (C1 of Figure 4) is also recommended at the input to the DC/DC
to provide a low source impedance and additional noise attenuation.
See typical performance curves for differential-mode insertion loss performance.
Common –mode noise is measured as variations between the input lines (in
common) with respect to the Ground pin. Common-mode noise is gener-
ally in the high frequency spectrum (>10MHz) and originates in the switching
components of the DC/DC converter. A capacitor from each line to the ground
pin (referred to as “Y” capacitors), connected between the two common mode
chokes, provides attenuation of this unwanted common-mode noise. This
ground pin should be connected to a relatively quiet chassis ground point inde-
pendent from the DC/DC converter case connection. Note that a noisy chassis
ground can inadvertently introduce common noise into the system. Some
DATEL DC/DC converters are designed with an internal input-to-outptut capaci-
tor to reduce common-mode noise generated from within the converter. In addi-
tion, common-mode noise can be reduced with the addition of external ceramic
capacitors of 0.1F to 1.0F (C2 thru C4 of Figure 4) installed from inputs and
outputs to a shield plane connected to the DC/DC case; safety standards may
limit the size of these capacitors for some applications. See typical performance
curves for common-mode insertion loss performance.
FLT-100V series filters incorporate an internal, multi-layer film polymer capacitor
between the input lines for differential-mode noise filtering. This telecom/data-
com preferred capacitor provides electrical stability under both AC and DC
current loads. The capacitors insulation resistance tends to improve under the
stresses of heat and voltage. A typical ESR of 6 milli-OHMs @ 500kHz, pro-
vides the necessary low impedance for high frequency input current handling.
FLT Series
Filter Modules, 100Vdc, 10 Amp and 20 Amp
Differential/Common-Mode Filters
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
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