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Low voltage DC supply dimmable ballast for 1 x 36W T8 lamp

Posted: 12 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC supply? dimmable ballast? 36W lamp IR21592?

It is possible to design an effective dimmable ballast based around the IR21592 that is powered from a low voltage DC supply instead of the AC line. A non-dimmable version based around the IR2156 is also possible using the same basic configuration. This application note shows a ballast for a single 36W T8 lamp driven from a 30V DC supply. Lower supply voltages are possible. However, the IR21592 control IC requires up to 13V supplied to the VCC pin before it will operate. Also, as the current is high large conductors are needed to keep losses at an acceptable level (for a 36W ballast operating from a 30V supply the input current is around 1.25A).

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