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Integrated power modules require no external parts

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By Jean-Pierre Joosting

The MagI³C FISM family of 1-W fixed isolated SIP power modules from Würth Elektronik feature continuous short-circuit protection (SCP) and increased isolation voltage. The improved integrated voltage converters come in nine new modules in standard SIP-4, SIP-7 and SMT-8 packages that are pin-to-pin compatible with the previous MagI³C FISM power modules.

The MagI³C FISM power modules are fully integrated DC/DC voltage converters with a fixed output voltage. The modules contain the power stage, transformer, input and output capacitance. No external components are required for operation, and circuit design effort is minimal. This reduces development costs and makes it possible to go to market quickly with new applications. The entire product line is certified to the current UL standard UL62368-1, but the new modules offer even more safety. They cannot be destroyed by short circuits and can withstand an isolation voltage of 1.5 kV for the SIP-4 modules and 3 kV for SIP-7 and SMT-8 for a full 60 seconds.

This makes the new MagI³C-FISM more useful in functional isolation to prevent ground loops and ground level offsets as well as to prevent interference in the signal path or sensor systems. This isolation voltage is important when designing power supplies for interfaces and microcontrollers within test equipment or industrial electronics.

Würth Elektronik carried out measurements on the power modules with various filter combinations, whose parts are listed in the data sheet, and found that the radiated and conducted emissions of the MagI³C-FISM modules are below the limits of the EMC standard EN55032 / CISPR32 Class B.

The latest members of the MagI³C-FISM family are available from stock. With their easy-to-assemble leaded SIP-4 and SIP-7 packages with through-hole or the SMT-8 packages, which can also be soldered manually, they are suitable for prototyping, Free samples can be requested for this purpose.

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