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IW3612 Datasheet, PDF (1/18 Pages) Dialog Semiconductor – AC/DC Digital Power Controller for Dimmable LED Drivers | |||
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iW3612
AC/DC Digital Power Controller for
Dimmable LED Drivers
1.0 Features
ââ Isolated AC/DC offline 100VAC /230VAC LED driver
ââ Line frequency ranges from 45Hz to 66Hz
ââ Intelligent wall dimmer detection
xx Leading-edge dimmer
xx Trailing-edge dimmer
xx No-dimmer detected
xx Unsupported dimmer
ââ Hybrid dimming scheme
ââ Wide dimming range from 1% up to 100%
ââ Optimized for PF > 0.7
ââ No visible flicker
ââ Resonant control to achieve high efficiency, 85% without
dimmer
ââ Temperature compensated LED current
ââ Small size design
xx Small size input bulk capacitor
xx Small size output capacitor
xx Small transformer
ââ Primary-side sensing eliminates the need for
opto-isolator feedback and simplifies design
ââ Tight LED current regulation ± 5%
ââ Fast start-up, typically 10µA start-up current
ââ Hot-plug LED module support
ââ 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
ââ Up to 25W output power
2.0 Description
The iW3612 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. iW3612âs unique digital control technology
eliminates visible flicker.
iW3612 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.
iW3612 operates in quasi-resonant mode to provide
high efficiency. The iW3612 provides a number of key
built-in features. The iW3612 uses iWattâs advanced primary-
side sensing technology to achieve excellent line and load
regulation without secondary feedback circuitry. In addition,
iW3612âs pulse-by-pulse waveform analysis technology
allows accurate LED current regulation. The iW3612
maintains stability over all operating conditions without the
need for loop compensation components. Therefore, the
iW3612 minimizes external component count, simplifies EMI
design and lowers overall bill of materials cost.
3.0 Applications
ââ Dimmable LED luminaires
ââ Optimized for 3W - 25W output power
ââ Capable of higher output power with enhanced external
driver
iW3612
Rev. 1.6
iW3612
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