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Power Supply / Driver for LED Fluorescent
Power Supply / Driver for LED Fluorescent
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Old 19th November 2008, 12:00 PM   #1
Astro Power is offline Astro Power  Israel
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Join Date: Sep 2004
Location: Binyamina
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 :

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,

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Old 20th November 2008, 10:36 PM   #2
aandy is offline aandy  United Kingdom
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Join Date: Mar 2007
Location: in UK unfortunatly
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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.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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