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參數(shù)資料
| 型號(hào)： | F4810-R |
| 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)： | 38/41頁 |
| 文件大?。?/td> | 1387K |
| 代理商： | F4810-R |
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MCD10059 Rev. 1.0
Page 6 of 41
www.power-one.com
F & FC Series DC-DC Converter Input Filters
F4804A, 0-80V, 4 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 48V 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 per converter are recommended:
–
TDK C4532X7R2A105, 1.0 F, 100 V
Common-mode capacitor (Y-cap) values and
their EMI attenuation effects depend on system
grounding and layout.
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 (CY1 and CY2 on
Fig. 5). 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.
F4804A filter should be protected with a 5 Amps
fuse (R451005 from Littelfuse). Smaller value
fuses can be used as required for protection to a
lower power limit.
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