Digital LED drivers enable hot-plug, flicker-free dimming

iWatt announced two primary-side-regulated, leading- and trailing-edge-dimmable, AC/DC digital PWM controllers targeting 100V/230VAC offline LED lighting applications.

Designed for LED drivers used in space-constrained incandescent replacement lamps, the iW3612 (3W to 25W) and iW3602 (3W to 10W) LED driver ICs are pin compatible with the previous-generation iW3610, but offer wider dimmer compatibility and introduce new hot-plug support, where the user can swap the LED engine without recycling the input power for the LED driver. 

Key highlights:

• Isolated AC/DC offline 100 Vac / 230 Vac LED driver
• Up to 25 W output power (iW3612) and 10W output power (iW3602)
• Line frequency ranges from 45 Hz to 66 Hz
• Intelligent wall dimmer detection
• 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
• Primary-side sensing eliminates the need for opto-isolator feedback and simplifies design
• Tight LED current regulation ±5%
• Fast start-up, typically 10 μA start-up current
• Hot-plug LED module support
• Multiple protection features

Pricing: The iW3602 is priced at $0.84 and the iW3612 at $0.98 in 1,000-piece quantities.

Availability: Sampling.

Product briefs: iW3602 and iW3612