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SI3021 Datasheet(PDF) 45 Page - List of Unclassifed Manufacturers |
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SI3021 Datasheet(HTML) 45 Page - List of Unclassifed Manufacturers |
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45 / 54 page  Si3035 Rev. 1.2 45 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, as well as 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 of 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 75 Ω @ 100 MHz, 6 A TIP FB2 RING C25 75 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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