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參數(shù)資料
| 型號(hào)： | F4810 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 數(shù)據(jù)傳輸濾波器 |
| 英文描述： | 1 FUNCTIONS, 80 V, 10 A, DATA LINE FILTER MODULE |
| 文件頁數(shù)： | 4/41頁 |
| 文件大?。?/td> | 1387K |
| 代理商： | F4810 |
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MCD10059 Rev. 1.0
Page 12 of 41
www.power-one.com
F & FC Series DC-DC Converter Input Filters
F2410 & F4810, 0-45V/0-80V, 10 Amps, SMT Mount
For additional information regarding layout and EMC,
refer to the Layout Considerations and EMI
Considerations Application notes.
The following bulleted items are considerations
regarding the external components for the typical
application shown in Fig. 5.
Input electrolytic capacitor C1. We recommend
1-2 F/W for 48 V applications, and 2-4 F/W for
24 V applications. This capacitor is needed to
ensure stability of converters in presence of their
negative input impedance characteristic. Note that
electrolytic capacitors at –40 C have 3-5 times
less capacitance than at room temperature, and
therefore it is good practice to check the power
system at worst case conditions from this point of
view, i.e. lowest ambient temperature, minimum
input voltage, and maximum load. If electrolytic
capacitors are restricted for use in the system,
please contact the factory.
Input capacitors C2, C3 are optional; they
decrease input ripple current and improve EMI.
One or two of the following ceramic chip
capacitors, as required, per converter are
recommended:
–
TDK C4532X7R2A105, 1.0 F, 100V - for
48 V applications
–
TDK C4532X7R1H475, 4.7 F, 50V - for
24 V applications
Common-mode capacitor (Y-cap) values and
their EMI attenuation effects depend on system
grounding and layout (they are not shown on Fig.
5). In EMI testing with the filter, ceramic
capacitors between input and output of the
converter (C4 – C7) were very helpful. Typical
values for the capacitor between Vin- and Vout-
are 3,300 pF – 5,100 pF, and for the capacitor
between Vin+ and Vout+, 0 to 3,300 pF.
If connection of capacitors between input and
output
is
prohibited
because
of
system
restrictions, connect Y-capacitors only from each
input pin to system ground. The value of these
capacitors in this case is “the bigger the better”
(preferably 0.1 F or larger). Voltage rating of
Y-capacitors depends on the system isolation
and safety requirements.
Output capacitors C8, C9 are optional to reduce
output ripple. Addition of one-two 47 F ceramic
capacitors,
for
example,
for
low
voltage
applications 3.3 V and below, significantly
decreases output ripple from 25-40 mV peak-to-
peak to 5-10 mV. Recommended capacitor for
these
low
voltage
applications
is
C3225X5R0J476 from TDK.
UL testing was performed with a 12 Amps fuse
(R451012 from Littelfuse). Fuses larger than
12 Amps should not be used. Smaller value
fuses can be used as required for protection to a
lower power limit.
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