Non-dimmable LED driver for 45W commercial SSL lighting

The iW3623 is a high performance, two-stage, non-dimmable 45W SSL LED driver that integrates boost and flyback converters into a single IC to reduce BOM cost and simplify design versus conventional two-stage driver approaches. Compliant to the IEC61000-3-2 standard, the iW3623 offers Power Factor (PF) >0.95 from a universal input voltage of 100VAC to 277VAC, with total harmonic distortion (THD) <10% and low output ripple <5% over the entire range.

The iW3623 incorporates Dialog’s proprietaryPrimAccurate™一次侧控制技术,消除了need for a secondary-side regulator and optical feedback isolator. It also allows FETs to be replaced with lower cost BJTs and uses quasi-resonant mode switching for both the boost and flyback stages and dynamic base current to optimize conversion efficiency and minimize EMI.

Protection features include an on-board, external NTC-based temperature protection circuit that reduces the output drive to the LEDs to protect the circuit from overheating while maintaining light output. For more information on the over-temperature protection derating feature,click here.