25W, Single-Stage, Bleederless Off-Line Controller for High PF Dimmable SSL Applications

A team of engineers is ready to answer your questions

Dimmable SSL single-stage driver

The iW3605 single-stage, 25W LED driver operates without the need for a bleeder circuit while maintaining broad dimmer compatibility, providing a cost-optimized solution with high PF (>0.92) and low THD (<20%).

The iW3605 integrates Dialog’s patented intelligent dimming control to provide compatibility with a wider range of dimmers, including TRIAC, digital and universal dimmers. This technology uses digital analytics to query the dimmer and applies algorithms that automatically adapt to the dimmer type.

The iW3605 is fully protected, including Dialog's patented configurable over-temperature protection (OTP) derating.  This OTP feature protects the entire LED driver circuit from excessive heating while enabling continuous light output even under high ambient temperatures often found in low airflow bulb installations.  For more detailed information on this important protection feature, click here.


  • 25W Output Power
  • Single-Stage, Bleederless Design for Low BOM Cost
  • Wide Dimmer Compatibility
    • TRIAC and Digital
    • Automatic Detection of Dimmer Type
  • Configurable Dimming Curves – NEMA SSL 6-compliant


  • High Power Factor (PF) > 0.92
  • Low Total Harmonic Distortion (THD) < 20%
  • PrimAccurate­™ Digital Control
    • Isolated Off-Line Control without Optical Feedback Isolator
  • Zhaga Hot-plug Compliant
  • Built-in, Configurable Over-Temperature Protection with Automatic Derating of LED Current


  • 25W Dimmable SSL Retrofit Lamps and External Lighting Ballast Drivers
  • Retrofit SSL Bulbs: A19, PAR, T8

Block Diagrams

Typical Applications Diagram
Functional Block Diagram


Product Briefs and Summaries

For technical support or information on how to buy, contact us directly.

Request Samples Contact Us Register for newsletter

Need technical help?

Visit our support web site to:

  • Get help from Dialog experts online.
  • Search the forums.
  • Access software, drivers, tools & utilities.