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Old 19th November 2008, 12:00 PM   #1
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Default Power Supply / Driver for LED Fluorescent

LED Fluorescent have this power supply,

each LED get 3.08-3.03V in 13.7-14mA.
29 LED in series.

i have products like this, it look like :
PIC

i drawing the power supply, and i have some quastions,
1)some other LED company put the "coil1" before the diodes, it is better or not ? and please whay ?

2) when i short the legs of "Coil2" the light get lower in 40% why is that ? and what the function of the "Coil2"?

3) i dont find specification on the IC, and for the diodes 75A / PJ79 (ES1J)?

4) the circuit is stable ? will work for 40000-50000 Hours ?

Thank you,
Tamir

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Old 20th November 2008, 10:36 PM   #2
aandy is offline aandy  United Kingdom
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Location: in UK unfortunatly
Nice
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Old 21st November 2008, 10:37 PM   #3
star882 is offline star882  United States
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That circuit is more or less just a nonisolated current mode buck converter. The strange circuit with the two capacitors and three diodes is a simple charge pump. The capacitors are charged in series (presumably by 240v AC given their voltage ratings) and discharged in parallel. That decreases the average voltage to the buck converter.
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