iW3688
AC/DC Advanced Digital Power Controller for
Single-Stage Dimmable LED Drivers
1 Description
The iW3688 is a single-stage, high-performance AC/DC off-line power supply controller for dimmable
LED luminaires. It applies advanced digital control technology to detect the dimmer type, enabling it to
provide dynamic impedance to interface with the dimmer and to control the LED brightness at the same
time.
With advanced dimmer detection technology, the iW3688 can operate with most wall dimmers including
leading-edge dimmers (R-type or R-L type), trailing-edge dimmers (R-C type), and smart dimmers. In
addition, the iW3688’s cycle-by-cycle waveform analysis technology allows for fast dimmer transient response.
In no-dimmer mode, the iW3688 operates the main power converter that delivers current to the LED load in quasi-
resonant mode to provide high power efficiency and low electro-magnetic interference (EMI). When there is no dimmer
on the line, the iW3688 optimizes the power factor and minimizes the current harmonic distortion to the AC line. The
commonly utilized converter topologies for iW3688 are buck-boost and flyback.
The iW3688 uses patented PrimAccurate™ primary-side sensing technology to achieve excellent LED current
regulation under different AC line and LED load voltages, without using a secondary-side feedback circuit and thus
eliminating the need for an optocoupler.
The iW3688 minimizes the external components count by simplifying the EMI filter with Dialog’s EZ-EMI® technology,
and by integrating current sink, switching, and VCC charging circuit. Additionally, the iW3688 does not require an
auxiliary winding, which eliminates the need for a custom inductor. The digital control loop of the iW3688 maintains
stability over all operating conditions without the need for loop compensation components.
The iW3688 maintains high performance wide-range dimming and achieves excellent dimmer compatibility with a
simple application circuit.
2 Features
● Resonant control to achieve high efficiency
(typical > 85% without dimmer)
● Isolated/non-isolated off-line 120VAC/230VAC LED
driver up to 20W output power
● Excellent AC line distortion immunity ensures quality
of product under real-life circumstances
● Wide line frequency range (from 45Hz to 66Hz)
● Meets IEC61000-3-2 current harmonic requirement
● Total harmonic distortion < 20% with PF > 0.92
● Excellent dimmer compatibility
● Over-temperature LED current foldback and
shutdown
● Tight LED current regulation (±5%)
● Fast start-up (< 0.5s without dimmer)
● Multiple protection features that include:
x
x
x
Leading-edge dimmer
Trailing-edge dimmer
Digital smart dimmer
x
x
LED open-circuit and short-circuit protection
● Wide dimming range of 1% to 100%
Current sensing resistor open circuit and short-
circuit protection
● Intelligent digital control integrating current sink
function into power switching circuit
x
x
AC line over-voltage protection
Over-current protection
● Advanced IC power management and voltage sensing
enables the use of off-the-shelf inductor
3 Applications
● Dimmable LED retrofit lamps up to 20W
● Dimmable LED luminaires up to 20W
Product Summary
Rev. 1.2
06-Feb-2022
© 2022 Renesas Electronics
www.renesas.com
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