iW3617
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
1 Description
The iW3617 is a two-stage, high-performance AC/DC offline power supply controller for
dimmable LED luminaires. It applies advanced digital control technology to detect the
dimmer type and phase, which provides dynamic impedance to interface the dimmer and
control the LED brightness at the same time. The iW3617 uses Dialog’s unique digital
FlickerlessTM technology to eliminate visible flicker in the entire dimming range and
minimize low frequency output ripple current.
With advanced dimmer detection technology, the iW3617 can operate with most wall dimmers including leading-edge
dimmers (R-type or R-L type) and trailing-edge dimmers (R-C type). In addition, the iW3617’s cycle-by-cycle waveform
analysis technology allows fast dimmer setting response. When no dimmer is on the line, the iW3617 optimizes the
power factor and minimizes the current harmonic distortion to the AC line.
The iW3617 operates the main power converter that delivers constant current to the LED load in quasi-resonant
mode to provide high power efficiency and minimize electro-magnetic interference (EMI). It uses Dialog’s patented
PrimAccurateTM 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 eliminating the need for an optocoupler.
The iW3617 minimizes the external components count by simplifying the EMI filter with Dialog’s EZ-EMI® technology.
The intelligent dimmer detection technology eliminates the need for a high-power bleeder. Additionally, the digital
control loop of the iW3617 maintains stable overall operating conditions without the need for loop compensation
components.
2 Features
● Isolated/non-isolated offline 120VAC/230VAC LED
driver up to 25W output power
x
Intelligent dimmer interface eliminates dedicated
high-power bleeder
● Wide line frequency ranges (from 45Hz to 66Hz)
● Meets IEC61000-3-2 requirement
● PrimAccurate™ primary-side sensing eliminates the
need for optocoupler feedback
● Tight LED current regulation (± 5%)
● Fast start-up (< 0.5s without dimmer)
● Supports hot-plug LED module (Zhaga)
● Total harmonic distortion < 15% with PF > 0.95
● Wide dimmer compatibility
x
x
x
x
Leading-edge dimmer
Trailing-edge dimmer
Digital dimmer
● Compatible with NEMA SSL6 dimming curve
standard
● Supports wide LED output voltage range
● Multiple protection features:
Occupancy sensors and timers
● Under 20% output ripple current
● Wide dimming range from 1% to 100%
● FlickerlessTM LED dimming
x
x
x
x
LED open-circuit and short-circuit protection
Over-current and over-temperature protection
Current sense resistor short-circuit protection
AC line over-voltage/-frequency protection
● Resonant control to achieve high efficiency (typical >
85% without dimmer)
● Over-temperature LED current foldback
● Small solution size
3 Applications
● Dimmable LED retrofit lamps up to 25W
● Dimmable LED ballast and luminaires up to 25W
x
Two-stage topology enables small-size input and
output filter capacitors
x
200kHz maximum switching frequency enables
small transformer
04-Feb-2022
Product Summary
Rev. 1.2
© 2022 Renesas Electronics
www.renesas.com
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