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

25/37

Secondary side serial connection

To generate higher output voltage/special rail voltages it is possible to put the outputs of the 176xxxxx2 in series. It is

common practice to connect an additional capacitor between the +VOUT and

–VOUT.

+VIN

-VIN

-VOUT

+VOUT

Module 2

2

1

4

5

L2

C2

Decoupl ing fi lter

+VIN

-VIN

-VOUT

+VOUT

Module 1

2

1

4

5

L1

C1

Decoupl ing fi lter

Capacitor

+

-

DC

BUS

+

-

When using multiple modules connected to a single dc bus voltage the individual module inputs have to be decoupled by LC

filters. The LC filter reduces the likelihood of oscillations due to parasitics of a layout/routing. Therefore, it is not

recommended to connect power modules in parallel on the primary side without an LC filter. See also Primary side parallel

connection on page 25.