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 mode to provide high efficiency and uses Dialog’s PrimAccurate™advanced primary-side sensing technology to achieve excellent line and load regulation without secondary-feedback components. And, by using Dialog’s Flickerless™ technology, virtually all flicker is removed from the output. The digital control algorithms used by the iW3629 maintain stability over all operating conditions without the need for any external loop compensation components, minimizing the BOM cost.

2.Features

●Supports universal, 90VAC-277VAC input voltage range and output power up to 120W or above

●Two-stage design (boost and flyback)xHigh PF (> 0.95) and low THD (< 10%) over entire input voltage range and 50%-100% load current

●Under 5% 100Hz/120Hz output current ripple

●Quasi-resonant control for both boost and flyback stages to achieve high efficiency

●Over-temperature derating protection with external NTC to program derating start temperature

●Fast yet smooth boost start-up scheme to achieve short PF settling time

●Fast line transient response ensures minimal bulk voltage overshoot within the capacitor safety limit

●Small size designxSmall size input bulk capacitorxSmall size output capacitorxSmall transformer

●Flickerless technology - removes virtually all flicker

●PrimAccurate primary-side sensing eliminates the need for optocoupler feedback and simplifies design

●Tight LED current regulation (± 5%)

●Under 0.5s start-up time

●Hot-plug LED module support

●Multiple protection features:

xLED open circuit protection

xSingle-fault protection

xOver-current protection

xLED short-circuit protection

xCurrent sense-resistor-short-circuit protection

xInput over-voltage and brown-out protection

xInternal junction temperature-based over-temperature protection

3 Applications

●Non-dimmable LED lamps and luminaires●Output power up to 120W or above

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