The Delphi series FL75L05 A filter module is the latest offering from a
world leader in power systems technology and manufacturing – Delta
Electronics, Inc. This filter module is designed to reduce the conducted
common-mode and differential-mode noise on input or output lines of
high-frequency switching power supplies and has a maximum current
rating of 5A. It has the industry standard footprint and pin-out. With
creative design technology and optimization of component placement,
Delphi FL75L05 A filter module possesses outstanding electrical and
thermal performance, as well as extremely high reliability under highly
stressful operating conditions.
APPLICATIONS
Common-mode and differential-mode
filtering of power supply dc input and
output line
Computer application
Communications equipment
DATASHEET
DS_FL75L05_ 10172005
SPECIFICATIONS
GENERAL SPECIFICATIONS
Input voltage, continuous
Input voltage, transient
Typical
Typical
0~75V
100V
-40℃ ~ 120℃
-55℃ ~ 125℃
Output current
Output current
Common-mode Insertion Loss
OUTPUT SPECIFICATIONS
Ta=75°C, no airflow
Ta=85°C, no airflow
50Ω circuit, 500 kHz (Typ)
5A
4A
43dB
45dB
Operation case temperature Typical
Storage temperature
Size
Typical
Differential-mode Insertion Loss 50Ω circuit, 500 kHz (Typ)
(1.0”. x 1.0”x 0.4”). 25.4 x 25.4 x 10.2 mm
ELECTRICAL CHARACTERISTICS CURVES
Figure 1:
Typical common-mode insertion loss in a 50Ω circuit
Figure 2:
Typical differential-mode insertion loss in a 50Ω
circuit
Internal Schematics
Figure 3:
Internal schematics
2
THERMAL CONSIDERATIONS
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
THERMAL CURVES
OUT
GND
OUT
(0.6in)
15mm
Natural
Convection
3
Thermal Testing Setup
Delta’s filter modules are characterized in heated
vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
The following figure shows the wind tunnel
characterization setup. The filter module is mounted on
a test PWB and is vertically positioned within the wind
tunnel. The space between the neighboring PWB and
the top of the power module is 6.35mm (0.25”).
7mm
(0.275in)
Figure 5:
Temperature measurement location
The allowed maximum hot spot temperature is defined at 120
℃
Output Current(A)
6
FL75L05 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin = 48V (Either orientation)
5
Thermal Derating
Heat can be removed by increasing airflow over the
module. Figure 4 shows maximum output is a function of
ambient temperature and airflow rate. To enhance system
reliability, the power module should always be operated
below the maximum operating temperature. If the
temperature exceeds the maximum module temperature,
reliability of the unit may be affected.
4
100LFM
2
1
0
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
FACING PWB
PWB
MODULE
Figure 6:
Output Current vs. Ambient Temperature and Air
Velocity @ Vin = 48V (Either Orientation)
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
AIR FLOW
50.8 (2.0”)
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 4:
Wind tunnel test setup figure dimensions are in
millimeters and (inches).
3
APPLICATION
Note: C2 through C5 can be 0.01μF to o.1μF. Select the voltage rating to meet input-to-output isolation requirements. C1 should be the recommended
value indicated in the power module data sheet.
Figure 7.
Recommended schematic when used as the input filter to a high-frequency dc-to-dc converter
Note: Vdc input(+) and Vdc input(-) planes should overlay each other, as should the Vi(+) and Vi(-) planes, as should the Vout(+) and Vout(-) planes. Avoid
routing signals or planes under the power module or the filter module. Ensure all connections are low impedance.
Figure 8.
Recommended layout when used as the input filter to a high-frequency dc-to-dc converter
4
APPLICATION (Continued)
Note: : C2 through C5 and C6 through C9 can be 0.01μF to o.1μF. Select the voltage rating to meet input-to-output isolation requirements. C1 should be
the recommended value indicated in the power module datasheet.
Figure 9.
Recommended schematic of filter module with two power modules
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