1769205x2, 176881212, 176861512

FISM

– Fixed Isolated SMT Module

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Würth Elektronik eiSos GmbH & Co. KG

– Data Sheet Rev. 1.0

©July 2018

27/37

EVALUATION BOARD SCHEMATIC (17800VISM v.1.0)

IC2

C8

IN

EN

GND

FB

OUT

C10

+

C9

R3

R4

C6

C2

C7

+

C1

+VIN

-VIN

-VOUT

+VOUT

IC1

2

1

7

6

C3

L3

L3

L1

L2

J1-J7

R1

R2

C4

+

C5

L4

L5

Optional

Section 1

Section 2

EMI Section

– Section 1 & Section 2

The FISM evaluation board is a multi-functional EMI optimization tool. It offers the possibility to optimize the EMI behavior

based on the application requirements by placing multiple differential (DM) and/or common mode (CM) filters.

Therefore, the evaluation board consists of three different filter sections. The tables below show the main component

selection possibilities:

Section 1

– green:

Section 2

– blue:

Filter type

Description

Filter type

Description

DM

C2 + L1

CM (Y-Cap)

C6

DM (PI)

C2 + L1 + C3

CM (Y-Cap)

C7

DM

C2 + L2

CM (Y-Cap)

C6 + C7

DM (PI)

C2 + L2 + C3

CM

L1+L2

CM

L3

DM

C2 + L4

DM (PI)

C2 + L4 + C3

DM

C2 + L5

DM (PI)

C2 + L5 + C3

CM

L4 + L5

Beside these two basic filter topologies, mixed versions (section 1 + section 2) are also possible with this evaluation board.

The optional additional aluminum electrolytic capacitor C1 is only for evaluation board protection purpose. It is mounted as

termination of the supply line and provides a slight damping of possible oscillations of the series resonance circuit

represented by the inductance of the supply line and the input capacitance.