iW3614
AC/DC Digital Power Controller for
High Power Factor Dimmable LED Drivers
1.0 Features
2.0 Description
● Isolated AC/DC offline 100 VAC / 230 VAC LED driver
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.
● Meets harmonic requirements, high power factor
(power factor > 0.9 without dimmer)
● Line frequency ranges from 45Hz to 66Hz
● Intelligent wall dimmer detection
x
x
x
x
Leading-edge dimmer
Trailing-edge dimmer
No-dimmer detected
Unsupported dimmer
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.
● Hybrid dimming scheme
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
● Wide dimming range from 1% up to 100%
● No visible flicker
● Resonant control to achieve high efficiency, 85% without regulation without secondary feedback circuitry. In addition,
dimmer
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.
● Temperature compensated LED current
● Small size design
x
x
x
Small size input bulk capacitor
Small size output capacitor
Small transformer
3.0 Applications
● Primary-side sensing eliminates the need for opto-
isolator feedback and simplifies design
● Dimmable LED luminaires
● Optimized for 3W - 15W output power
● Tight LED current regulation ± 5%
● Fast start-up, typically 10µA start-up current
● Hot-plug LED module support
● Capable of higher output power with enhanced external
driver
● Multiple protection features:
x
x
x
x
x
x
x
LED open circuit protection
Single-fault protection
Over-current protection
LED short circuit protection
Current sense resistor short circuit protection
Over-temperature protection
Input over-voltage protection
Rev. 0.7
iW3614
Page 1
PReliminaRy