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iW3629

Dialog Semiconductor
Part Number iW3629
Manufacturer Dialog Semiconductor
Description Digital Off-Line LED Driver
Published May 7, 2018
Detailed Description iW3629 Two-Stage, Flickerless™ Digital Off-Line LED Driver with High PF and Low THD 1 Description The iW3629 is a high-p...
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iW3629
iW3629

Overview
iW3629 Two-Stage, Flickerless™ Digital Off-Line LED Driver with High PF and Low THD 1 Description The iW3629 is a high-performance AC/DC off-line digital power supply controller for LED luminaires up to 120W or above.
The two-stage design combines high power factor (PF > 0.
95), low total harmonic distortion (THD <10%) and negligible line frequency ripple (< 5%) to make the iW3629 ideal for high-power non-dimmable LED lamps and luminaires.
The two-stage approach allows the first-stage boost converter to convert the rectified AC voltage (90VAC to 277VAC) to an intermediate voltage while correcting for power factor.
The second-stage flyback converter then provides the constant current regulation to the LEDs.
The combination of an active start-up circuit and fast yet smooth soft-start for both boost and flyback stages results in a start-up time (AC plug-in to 90% of set LED current) of less than a half second and fast power factor settling time.
The iW3629 operates in a quasi-resonant mo...


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