page

date

DESCRIPTION: chassis mount dc-dc converter

10 of 10

08/2009

20050

phone

phone 503.612.2300 fax

www.v-infinity.com

fax 503.612.2383

PART NUMBER: VHK100W

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

18. OUTPUT FILTERING

The converter has built-in capacitors at the output to control ripple and noise. If desired, additional output capacitance can be

introduced at the input to the powered equipment. Recommended starting point: one 10μF tantalum and one 1μF ceramic capacitor in

parallel at the output.

19. OUTPUT NOISE MEASUREMENT SCHEMATIC

For proper output ripple and noise measurement, connect a 10μF tantalum and a 1μF ceramic capacitor across the output. Set the

scope bandwidth to 20MHz. Probe directly off of one of the capacitors, using a small ground clip to minimize measurement error.

Resistor

Load

To Scope

Solid Tantalum

10µF

Ceramic

1.0µF

+Vin

-Vin

-Vo

-S

Trim

+S

+

+Vo

FIGURE 11. OUTPUT NOISE MEASUREMENT CIRCUIT

CASE

+Vo

-Vo

+Vin

C1

-Vin

C2

L1

1. Conduction EN55022 class A

Model No.

C2

C3

L1

VHK100W-Q24-S28

47uF/50V KY

47uF/50V KY

3.4uH

VHK100W-Q48-S28

47uF/100V KY

47uF/100V KY

3.4uH

2. Conduction EN55022 class B

Model No.

C1

C2

L1

VHK100W-Q24-S28

220uF/50V KY

220uF/50V KY

3.4uH

VHK100W-Q48-S28

47uF/100V KY

47uF/100V KY

3.4uH

FIGURE 10.3. EMI FILTER FOR VHK100W-XXX-S28