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Circuits Lighting Offline LED Lighting
Circuits Power Management LED Driver ICs Offline LED Driver

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TRIAC Dimmable 20W Offline LED Driver Using the LT3799

View Full Size Image View Original Design Note TRIAC Dimmable 20W Offline LED Driver Using the LT3799

This circuit shows a complete LED driver solution. The LT3799 senses the output current from the primary side switch current waveform. The IC regulates the output current by adjusting the peak switch current and the duty cycle through a novel feedback control. Unlike other primary side sensing methods that need to know input power and output voltage information, this new scheme provides much better output current regulation since the accuracy is barely affected by transformer winding resistance, switch RDS(ON), output diode forward voltage drop and LED cable voltage drop.



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