AN829 Datasheet, PDF (9/9 Pages) STMicroelectronics – SEMICONDUCTOR KIT FOR

AN829 APPLICATION NOTE
CONCLUSIONS
This paper presents an optimized Power Factor Corrector built around a power module driven by the L4981 con-
trol IC. This STE36N50-DK ISOTOP power module is mounted directly on the PCB providing both very low in-
ductance layout and compact hardware.
Eliminating parasitic inductances enables tight control of switching di/dt and prevents turn off overvoltage.
Therefore faster switching speeds are allowed to reduce switching losses. The 2Amps current capability of the
controller is also a useful feature.
Combined with a single layer winding inductor, such a configuration results in very low EMI and RFI generation.
Finally, there is potential for further improvements using two features of the L4981:
– the possibility either to synchronize the IC with an external signal, or to modulate the PFC switching
frequency to spread the RFI noise.
– the extra multiplier input, which enables external compensation.
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by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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