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LM3444 A19 Edison Retrofit evaluation board

Posted: 10 Mar 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED forward current? Edison socket?

The evaluation board discussed in this document converts 85VAC to 135VAC input and drives five to thirteen series connected LED's at the currents listed in the Evaluation Board Operating Conditions section. This is a two-layer board using the bottom and top layer for component placement. The board is surrounded by a larger area allowing for extra test points and connectors for ease of evaluation. The actual board size is contained inside the larger outer area and can be cut out for the smallest size possible. The evaluation board can be modified to adjust the LED forward current and the number of series connected LEDs. The topology used for this evaluation board eliminates the need for passive power factor correction and results in high efficiency and power factor with minimal component count which results in a size that can fit in a standard A19 Edison socket. Output current is regulated within 15% of nominal from circuit to circuit and over line voltage variation.

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