1.0 Features
● Isolated/non-isolated offline 120VAC/230VAC LED driver up to 25W output power
● Wide line frequency ranges (from 45Hz to 66Hz)
● Meets IEC61000-3-2 requirement
● Total harmonic distortion 0.95
● Wide dimmer compatibility x Leading-edge dimmer x Trailing-edge dimmer x Digital dimmer x Occupancy sensors and timers
● Under 20% output ripple current
● Wide dimming range from 1% to 100%
● FlickerlessTM LED dimming
● Resonant control to achieve high efficiency (typical > 85% without dimmer)
● Over-temperature LED current foldback
● Small solution size x Two-stage topology enables small-size input and output filter capacitors x 200kHz maximum switching frequency enables small transformer x Intelligent dimmer interface eliminates dedicated high-power bleeder
● Primary-side sensing eliminates the need for opto-isolator feedback
● Tight LED current regulation (± 5%)
● Fast start-up (< 0.5s without dimmer)
● Supports hot-plug LED module (Zhaga)
● Compatible with NEMA SSL6 dimming curve standard
● Supports wide LED output voltage range
● Multiple protection features: x LED open-circuit and short-circuit protection x Over-current and over-temperature protection x Current sense resistor short-circuit protection x AC line over-voltage/-frequency protection
2.0 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 iWatt’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 iWatt’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 opto-coupler.
The iW3617 minimizes the external components count by simplifying the EMI filter with iWatt’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.
3.0 Applications
● Dimmable LED retrofit lamps up to 25W
● Dimmable LED ballast and luminaries up to 25W
Pinout Description
12.0 Physical Dimensions
Typical Application Schematic
