iW3631
Two-Stage, Flickerless™ 0-10V Dimmable Digital
Off-Line LED Driver with High PF and Low THD
1 Description
The iW3631 is a two-stage, high-performance AC/DC offline power supply controller for dimmable LED luminaires
with an analog dimming interface. It controls the LED current based on an analog input voltage on the dimming pin.
It has a built-in 0-10V dimming interface that works directly with 0-10V dimming systems, eliminating the need for a
driver circuit and microcontroller. It can also be implemented to support wireless SSL applications without the need
for auxiliary power supplies. The iW3631 uses Dialog’s unique digital FlickerlessTM technology to virtually eliminate all
flicker in the entire dimming range and to minimize low frequency output ripple current.
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 (PF) settling time.
The iW3631 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. The digital control algorithms used by the iW3631 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
● Built-in 0-10V isolation transformer driver
● Wide dimming range from 1% to 100%
● Two-stage design (boost and flyback)
● Flickerless technology - removes virtually all flicker
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High PF (> 0.95) and low THD (< 10%) over entire
input voltage range and 50%-100% load current
● PrimAccurate primary-side sensing eliminates the
need for optocoupler feedback and simplifies design
● Under 5% 100Hz/120Hz output current ripple
● Tight LED current regulation (± 5%)
● Under 0.5s start-up time
● Quasi-resonant control for both boost and flyback
stages to achieve high efficiency
● Hot-plug LED module support
● Multiple protection features:
● Fast yet smooth boost start-up scheme to achieve
short PF settling time
● Fast transient response ensures minimal bulk voltage
overshoot within the capacitor safety limit
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x
x
x
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LED open and short circuit protection
Single-fault protection
● Small size design
Over-current protection
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x
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Small size input bulk capacitor
Small size output capacitor
Small transformer
Current sense-resistor-short-circuit protection
Input over-voltage and brown-out protection
Internal junction temperature-based over-
temperature protection
3 Applications
● Dimmable LED ballast with analog input for dimming
control
● Dimmable LED ballast with 0-10V interface for
dimming control
● Wireless SSL lighting
● Output power up to 120W or above
23-January-2017
Product Summary
Rev. 1.1
www.dialog-semiconductor.com
1 of 7
© 2017 Dialog Semiconductor
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