High Power Factor Dimmable LED Drivers
●Isolated/non-isolated offline 120V
AC /230V
AC
徐媛LED driver
up to 25W output power
●Wide line frequency ranges (from 45Hz to 66Hz)
●Meets IEC61000-3-2 requirement
●Total harmonic distortion < 15% with PF > 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%
●Flickerless TM 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
x200kHz maximum switching frequency enables small transformer
x Intelligent dimmer interface eliminates dedicated high-power bleeder
●Primary-side sensing eliminates the need for
●Tight LED current regulation (± 5%)
连平中学
●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
钢管混凝土拱桥
x Over-current and over-temperature protection
x Current sense resistor short-circuit protection
x AC line over-voltage/-frequency protection 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 Flickerless TM 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 (E
MI). It uses iWatt’s patented PrimAccurate TM 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.
●Dimmable LED retrofit lamps up to 25W
●詹军道
Dimmable LED ballast and luminaries up to 25W
High Power Factor Dimmable LED Drivers
十二五科技成就展Booster Converter
Flyback Converter
Figure 3.1 : iW3617 Simplified Schematic
High Power Factor Dimmable LED Drivers
iW3617
High Power Factor Dimmable LED Drivers
Notes:
Note 1. ψJB [Psi Junction to Board] provides an estimation of the die junction temperature relative to the PCB surface
temperature. This data is measured at the ground pins (pin 8 and pin 9) without using any thermal adhesives.
Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to Electrical Characteristics in Section 6.0.
High Power Factor Dimmable LED Drivers V = 12 V, -40°C ≤ T ≤ 85°C, unless otherwise specified (Note 1)
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