AN2590 Datasheet, PDF (1/17 Pages) STMicroelectronics – 20 W dimmable CFL ballast solution

AN2590
Application note
20 W dimmable CFL ballast solution
Introduction
This application note describes the 20 W dimmable CFL ballast solution which can
completely replace incandescent lamps in formal dimming systems. The dimmer controlled
range is 20% - 100% of full light output without changing the formal triac dimmer.
Compared to the formal CFL solution, this solution not only provides energy savings, but
also higher reliability and a much longer operating life.
The solution is based on the high performance ballast driver L6574D, two of the
STD4NK50Z Zener protected SuperMESH™ Power MOSFETs, and two of the STTH1L06
turbo 2 ultra fast high voltage rectifiers.
Figure 1. Typical dimmer
Figure 2. Dimming CFL ballast solution
October 2007
Rev 1
1/17
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