SI3021 datasheet(45/54 Pages) ETC

45 / 54 page

Si3035

Rev. 1.2

A PPEND I X —U L1 950 3 RD E DI TIO N

Although designs using the Si3035 comply with UL1950

3rd Edition and pass all overcurrent and overvoltage

tests, there are still several issues to consider.

Figure 31 shows two designs that can pass the UL1950

overvoltage

tests,

well

electromagnetic

emissions. The top schematic of Figure 31 shows the

configuration in which the ferrite beads (FB1, FB2) are

on the unprotected side of the sidactor (RV1). For this

configuration, the current rating of the ferrite beads

needs to be 6 A. However, the higher current ferrite

beads are less effective in reducing electromagnetic

emissions.

The

bottom

schematic

Figure 31

shows

the

configuration in which the ferrite beads (FB1, FB2) are

on the protected side of the sidactor (RV1). For this

design, the ferrite beads can be rated at 200 mA.

In a cost optimized design, it is important to remember

that compliance to UL1950 does not always require

overvoltage tests. It is best to plan ahead and know

which overvoltage tests will apply to your system.

System-level elements in the construction, such as fire

enclosure and spacing requirements, need to be

considered during the design stages. Consult with your

professional testing agency during the design of the

product to determine which tests apply to your system.

Figure 31. Circuits that Pass all UL1950 Overvoltage Tests

C24

1.25 A

FB1

Ω @ 100 MHz, 6 A

TIP

FB2

RING

C25

Ω @ 100 MHz, 6 A

RV1

C24

1.25 A

TIP

RING

C25

600

Ω @ 100 MHz, 200 m A

FB1

FB2

RV1

600

Ω @ 100 MHz, 200 m A

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