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 コメント 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. 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 If you need isolation you might as well use the Flyback topology hello kiran, spock gave the same reply that i suggested u in private msg.....flyback!