IW3614 Datasheet, PDF (1/18 Pages) Dialog Semiconductor – AC/DC Digital Power Controller

iW3614
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
1.0 Features
●● Isolated AC/DC offline 100 V_AC / 230 V_AC LED driver
●● Meets harmonic requirements, high power factor
(power factor > 0.9 without dimmer)
●● Line frequency ranges from 45Hz to 66Hz
●● Intelligent wall dimmer detection
xx Leading-edge dimmer
xx Trailing-edge dimmer
xx No-dimmer detected
xx Unsupported dimmer
●● Hybrid dimming scheme
●● Wide dimming range from 1% up to 100%
●● No visible flicker
●● Resonant control to achieve high efficiency, 85% without
dimmer
●● Temperature compensated LED current
●● Small size design
xx Small size input bulk capacitor
xx Small size output capacitor
xx Small transformer
●● Primary-side sensing eliminates the need for opto-
isolator feedback and simplifies design
●● Tight LED current regulation ± 5%
●● Fast start-up, typically 10µA start-up current
●● Hot-plug LED module support
●● Multiple protection features:
xx LED open circuit protection
xx Single-fault protection
xx Over-current protection
xx LED short circuit protection
xx Current sense resistor short circuit protection
xx Over-temperature protection
xx Input over-voltage protection
2.0 Description
The iW3614 is a high performance AC/DC offline power
supply controller for dimmable LED luminaires, which uses
advanced digital control technology to detect the dimmer
type and phase. The dimmer conduction phase controls
the LED brightness. The LED brightness is modulated by
PWM-dimming. iW3614’s unique digital control technology
eliminates visible flicker.
iW3614 can operate with all dimmer schemes including:
leading-edge dimmer, trailing-edge dimmer, as well as
other dimmer configurations such as R-type, R-C type or
R-L type. When a dimmer is not present, the controller can
automatically detect that there is no dimmer.
iW3614 operates in quasi-resonant mode to provide high
efficiency. The iW3614 provides a number of key built-
in features. The iW3614 uses iWatt’s advanced primary-
side sensing technology to achieve excellent line and load
regulation without secondary feedback circuitry. In addition,
iW3614’s pulse-by-pulse waveform analysis technology
allows accurate LED current regulation. The iW3614
maintains stability over all operating conditions without the
need for loop compensation components. Therefore, the
iW3614 minimizes external component count, simplifies EMI
design and lowers overall bill of materials cost.
3.0 Applications
●● Dimmable LED luminaires
●● Optimized for 3W - 15W output power
●● Capable of higher output power with enhanced external
driver
iW3614
Rev. 0.7
iW3614
Preliminary

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