The iW3662 solid-state lighting (SSL) LED driver offers universal transformer compatibility and good dimmer compatibility for MR16 and other low-voltage lighting applications even with output power as low as 4W.

Renesas' digital control technology integrated into the iW3662 enables compatibility with electronic and magnetic transformers. The iW3662 automatically detects the transformer type and dynamically increases the peak loading to latch the transformer, ensuring compatibility with legacy electronic transformers, which present the most difficulty for MR16 LED replacement bulbs. The iW3662 also detects and works with virtually any dimmer across a wide dimming range of 5% to 100%.

Full protection features include Renesas' unique over-temperature protection (OTP) derating, which monitors the temperature inside the sealed LED bulb and seamlessly reduces the drive to the LEDs if the temperature rises above a safe operating threshold, it then restores brightness as temperature falls. The iW3662 integrates the temperature sensor and allows the user to configure the OTP thresholds.


  • Low Voltage Dimmable LED Lighting for MR16 - 12VAC and 10V to 24VDC
  • Output Power: 4W to 8W
  • Flexible Single-Stage or Two-Stage Design
  • Drives Low Voltage LEDs and High Voltage Chip-on-Board (COB) LEDs
  • Compatibility with Electronic Transformers (ET) and Magnetic Transformers (MT)
    • Automatic Detection of ET or MT
  • Wide Dimmer Compatibility - Leading Edge, Trailing Edge and Digital
    • Deep Dimming Down to 5% (Dimmer Dependent)
  • Low BOM Size/Cost
    • Uses Low-Cost, Off-the-Shelf Inductor
    • High-Frequency Operation for Smaller External Components
  • Power Factor (PF) >0.7
  • Fully Protected
    • Overvoltage Protection
    • Output Overvoltage, Overcurrent and Open-Load Protection
    • Over-Temperature Protection and Derating




  • VAC or VDC Input Dimmable LED Lighting
  • MR16 Replacement Bulbs, AR111 Fixtures/Bulbs
  • Lighting System Using Electronic Transformer


Type Title Date
Product Brief PDF 641 KB
Datasheet Log in to Download PDF 1.09 MB
Other Log in to Download ZIP 1.50 MB
Other Log in to Download ZIP 1.83 MB
Other Log in to Download ZIP 1.82 MB
White Paper Log in to Download PDF 279 KB
6 items

Design & Development