The iW3617 two-stage solid-state lighting (SSL) LED driver combines high power factor (PF >0.95), low THD (<15%) and low output ripple (<20%) for residential and commercial dimmable retrofit LED luminaires up to 25W. By using a bipolar junction transistor (BJT) power device, reducing component count for the protection circuits, and using lower-cost electrolytic capacitors, the iW3617 enables a very low overall BOM cost.

The iW3617 is compatible with the IEC 61000-3-2 specification for electromagnetic compatibility (EMC), the Zhaga hot-plug standard, and incorporates mapping options that fall within the NEMA SSL 6 dimming curves. It also uses Renesas' patented, intelligent digital dimming to automatically detect the dimmer type and phase, enabling broad compatibility with analog and digital dimmers.

Renesas' unique over-temperature protection (OTP) derating circuit monitors an external NTC resistor; reduces the output drive to the LEDs in small, virtually imperceptible increments; then restores brightness as the temperature falls. This prevents exceeding the temperature rating of the electrolytic capacitors and helps ensure a predictable, safer bulb operating life.


  • Ideal for 25W Off-Line Solid-State Lighting Applications
  • High PF (>0.95) and Low THD (<15%)
  • PrimAccurate™ - Isolated Off-Line AC/DC Controller
  • Integrates Renesas' Flickerless™ Technology
    • Removes Virtually All LED Flicker
  • Less than 20% Output Ripple at 100Hz/120Hz
  • 45Hz to 66Hz Line Frequency Range - 50Hz/60Hz Compatible
  • Broad Range of Dimmer Capability
    • Leading Edge, Trailing Edge, Digital Dimmers and Occupancy Sensors and Timers
    • Automatic Detection of Dimmer Type and Phase
    • 1% to 100% Wide Dimming Range
    • Automatically Detects and Operates without Dimmer
  • Quasi-resonant Mode for Optimal Efficiency
  • Compatible with SSL Industry Standards
    • Zhaga Hot-Plug Standard
    • NEMA SSL 6 Dimming Standard for Incandescent Replacement
  • Fully Protected
    • Works from DC Voltage Emergency Back-Up System
    • NTC-based Temperature Derating Circuit
    • Overvoltage/Over-Temperature Protection
    • Output Overvoltage, Overcurrent and Short Circuit
    • Open LED Fault Detection
    • Sense-Resistor Short Circuit Protection




  • Dimmable LED Ballasts and Luminaires up to 25W
  • Dimmable Retrofit Lamps up to 25W


Type Title Date
Product Brief PDF 569 KB
Datasheet Log in to Download PDF 1.51 MB
Other Log in to Download ZIP 3.52 MB
Other Log in to Download ZIP 3.44 MB
White Paper PDF 807 KB
White Paper PDF 843 KB
White Paper PDF 597 KB
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Design & Development