iW3640
AC/DC Digital Power Controller for Two-Channel
High Power Factor Dimmable LED Drivers
1 Description
The iW3640 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 iW3640 uses Dialog’s unique digital
FlickerlessTM technology to eliminate visible flicker in the entire dimming range and
minimize low frequency output ripple current. The iW3640 drives two-channel outputs. The
duty cycle of the second channel varies with the dimming ratio.
With advanced dimmer detection technology, the iW3640 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 iW3640’s cycle-by-cycle waveform
analysis technology allows fast dimmer setting response. When no dimmer is on the line, the iW3640 optimizes the
power factor and minimizes the current harmonic distortion to the AC line.
The iW3640 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 iW3640 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 iW3640 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
x
200kHz maximum switching frequency enables
small transformer
● Wide line frequency ranges (from 45Hz to 66Hz)
● Meets IEC61000-3-2 requirement
Intelligent dimmer interface eliminates dedicated
high-power bleeder
● PrimAccurate™ primary-side sensing eliminates the
● Total harmonic distortion < 15% with PF > 0.95
● Wide dimmer compatibility
need for optocoupler feedback
● Tight LED current regulation (± 5%)
● Fast start-up (< 0.5s without dimmer)
● Supports hot-plug LED module (Zhaga)
x
x
x
x
Leading-edge dimmer
Trailing-edge dimmer
Digital dimmer
● Compatible with NEMA SSL6 dimming curve
Occupancy sensors and timers
standard
● Under 20% output ripple current
● Wide dimming range from 1% to 100%
● FlickerlessTM LED dimming
● Supports wide LED output voltage range
● Multiple protection features:
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
x
x
Small solution size
3 Applications
Two-stage topology enables small-size input and
output filter capacitors
● Dimmable LED retrofit lamps up to 25W
● Dimmable LED ballast and luminaires up to 25W
04-Feb-2022
Product Summary
Rev. 1.1
© 2022 Renesas Electronics
www.renesas.com
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