MCD10059 Rev. 1.1, 21-Jan-10

Page 2 of 41

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F & FC Series DC-DC Converter Input Filters

F4804A, 0-80V, 4 Amps, SMT Mount

F4804A Applications

Differential and Common Mode filtering for dc-dc

converters:

 Telecommunications

 Data communications

 Distributed Power Solutions

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

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.

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