page

date

DESCRIPTION: half-brick dc-dc converter

9 of 10

04/2011

20050

phone

phone 503.612.2300 fax

www.v-infinity.com

fax 503.612.2383

PART NUMBER: VHB75W

15. INPUT FILTERING AND EMI INTERFERENCE

The VHB75W converters have input capacitors that control input current ripple and the associated EMI interference. However, it

has not been tested to a formal standard for conducted emissions. Additional filtering may be needed to ensure compliance to an

EMI standard. Refer to FIGURE 10 for a reference circuit.

V-Infinity offers a line of dc input filter modules designed to help reduce common and differential mode noise. The table below

provides a list of dc-dc converter models within the series and the mating dc input filter.

note: The recommended components are a starting point but not guaranteed for meeting these EMI requirements. More or less

filtering may be required for a specific application or to meet other EMI standards, e.g.MIL-STD-461

C4

CASE

+Vo

-Vo

+Vin

-Vin

L2

C3

C2

EMI to meet class A

VHB75W Series

C2

C3

C4

L2

47µF/50V

ESR<0.60

47µF/50V

ESR<0.60

2200pF/2KV

2.5µH

EMI to meet class B 220µF/50V

ESR<0.120

220µF/50V

ESR<0.120

2200pF/2KV

1.5µH

FIGURE 10. EMI FILTER FOR VHB75W

Series

Mating Filter Module

Notes

VHB75W-Q24-SXX

VFM-10A

VHB75W-Q48-SXX

VFM-10A