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Driving 125 White LEDs

Posted by: kiranmr on 08/25/2008
Hi, I want to drive 125 5mm or 10mm High Efficiency White LEDs. Please suggest the topology to be used. Input is 90-260V, Single Phase, 50Hz AC Thanks, Kiran

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Submitted by PI-Spock on 08/25/2008
Assuming that you dont need isolation I'd recommend driving 125 LED's in a single series string and using a simple Boost converter. This should also improve efficiency because of high voltage low current output.
Submitted by kiranmr on 08/25/2008
Hi, Thanks for the reply. There is a requirement for isolation. Does PI have any app note for a boost converter with TOPSwitch. I remember seeing one application with the TOP224 and TOP110 series some time back. Thanks Kiran
Submitted by PI-Spock on 08/26/2008
If you need isolation you might as well use the Flyback topology
Submitted by prasun on 08/27/2008
hello kiran, spock gave the same reply that i suggested u in private msg.....flyback!