iW3662
Low Voltage (12VAC) Dual-Mode Digital
Control Dimmable LED Driver
1 Description
The iW3662 advanced digital LED driver, designed for low voltage AC and DC input voltages, combines support for
both low voltage LEDs and high voltage Chip-On-Board (COB) LED modules at power levels up to 8W.
The iW3662 features two selectable operating modes to accommodate both low voltage LEDs and high voltage COB
LEDs in one part. The Boost-Buck mode provides a boost converter to step-up the input voltage to an intermediate
voltage, which a second buck regulator stage steps down to create a highly efficient, constant current LED controller.
The Boost-Linear mode, designed to work with high voltage COB LEDs, steps up the input voltage to a higher voltage
than in the Boost-Buck mode, then, with the buck converter now disabled and reconfigured into a linear current
regulator, provides a highly accurate constant current sink to drive the LEDs.
The highly configurable digital control circuitry allows the end user to specify one part for multiple applications,
covering the bulk of low voltage LED replacement bulb applications. Using Dialog’s Flickerless™ technology
allows the iW3662 to operate without visible flicker and operate with a broad range of input dimmer types (leading
edge, trailing edge and digital) while effectively detecting and managing both electronic and magnetic transformers
automatically. When the iW3662 detects a magnetic transformer, an additional output drives an external switch
that can add extra input capacitance needed to ensure proper operation, easing the design of replacement bulbs
compatible with both transformer types.
The iW3662 also integrates an internal bleeder FET to add a dynamic load to the input to optimize electronic
transformer performance during low dimming ranges. Also, full protection features include over-temperature
protection derating, which lowers the output current drive to the LEDs when an over-temperature event occurs to
maintain light output even during a fault condition. These protection features provide robust and functional solutions
for low voltage LED replacement lighting.
2 Features
● Wide dimmer compatibility (leading edge, trailing
● 10 to 24VDC input voltage or 12VAC input voltage
● Output power up to 8W
edge, and digital)
● Deep dimming to 5% (depends on dimmers)
● Power factor > 0.7
● Supports magnetic or electronic transformers
● Two operational modes
● Tight LED current regulation (±5%) in both modes
x
x
Boost-Buck - low voltage LED arrays
Boost-Linear - high voltage COB LEDs
● Optimized dimming curve for maximizing dimmer and
electronic transformer compatibility
● Integrated boost controller and buck/linear current
● Over-temperature protection derating
● OVP, OCP, and open load protection
● 16-lead QFN (4mm x 4mm) package
regulator controller
● Flickerless™ technology for flicker-free LED dimming
3 Applications
● VAC or VDC input dimmable LED lighting
● Optimized for use with all transformers, including
electronic and magnetic
● MR16 bulbs, AR111 fixtures/bulbs
06-Feb-2022
Product Summary
Rev. 1.5
1 of 6
© 2022 Renesas Electronics
www.renesas.com
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