www.micropowerdirect.com

EMC Specifications

Parameter

Standard

Radiated Emissions

See Note 1

EN 55022

Class A

Conducted Emissions

See Note 1

EN 55022

Class A

ESD

EN 61000-4-2

Criteria B; ±4 kV Contact

RS

EN 61000-4-3

Criteria A; 10V/m

EFT

See Note 2

EN 61000-4-4

Criteria B; ±2 kV

Surge

See Note 3

EN 61000-4-5

Criteria B; ±2 kV

CS

EN 61000-4-6

Criteria A; 3 Vrms

Voltage Dips

EN 61000-4-29

Criteria B; 0% - 70%

Typical Connection

The diagram at left illustrates a typical

connection of the MF3000xERU series

for applications that require meeting EMC

standards. The units do not require external

components to operate as specified. Some

notes on this diagram (starting with the

input circuit) are:

1. It is recommended that an external fuse

be used.The recommended fuse is shown

in the model chart on page 2.

2. An external MOV is recommended on the

input to protect the unit in the event of a

surge. A recommended value is given in

the table below.

3. An external TVS is recommended on the

input to protect the unit in the event of a

voltage spike. A recommended value is

given in the table at below.

high frequency, low resistance electrolytic

capacitor. Care must be taken in choosing

this capacitor not to exceed the capacitive

load specification for the unit. The board

layout illustrations at left show connec-

tions for single and dual output units.

Voltage derating of capacitors should be

80% or above.

5. Recommended values for components

are:

Component

MOV

10D560k

10D101k

56 µH

56 µH

TVS

SMCJ48A

SMCJ90A

120 µF/50V

120 µF/100V

4.7 µF/50V

2.2 µF/100V

2.2 mH

2.2 mH

4.7 µF/50V

2.2 µF/100V

1.0 nF/2 kV

1.0 nF/2 kV

6. In many applications simply adding

input/output capacitors will enhance

the input surge protection and reduce

output ripple sufficiently. The input

diagram above, and board layout draw-

ings at left their connection. In this case,

recommended capacitor values are:

10 µF for 24V input models

10 µF for 48V input models

8. The pad spacing between input/output

below should be a minimum of 2 mm.

Notes:

1. All units are rated for EN 55022 (CE/RE) class A without external components.

They will meet class B with the addition of the MDCFM-1B (or a similar discrete

filter circuit). Contact the factory for more information.

2. TomeettherequirementsofEN61000-4-4(±2kV),externalcomponentsareneeded,

as shown on the typical connection diagram below.Use the MDCFM-1B to meet

EN 61000-4-4 (±4 kV). Contact the factory for more information.

3. To meet the requirements of EN 61000-4-5 (±2 kV), external components are

needed. This can be done discretely, or with the addition of the MDCFM-1B.

Contact the factory for more information.