Flickerless™ High PF (> 0.95), Off-Line LED Driver for 25W Dimmable Solid State Lighting

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High PF solid state dimmable LED driver up to 25W

The iW3617 two-stage 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 BJT power device, reducing component count for the protection circuits, and using lower-cost E-capacitors, the iW3617 enables a very low overall BOM cost.

The iW3617 is compatible with the IEC61000-3-2 specification for electromagnetic compatibility (EMC), the Zhaga hot-plug standard, and incorporates mapping options that fall within the NEMA-6 SSL dimming curves. It also uses Dialog’s patented, intelligent digital dimming to automatically detect the dimmer type and phase, enabling broad compatibility with analog and digital dimmers.

Dialog’s 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 temperature falls. This prevents exceeding the temperature rating of the electrolytic capacitors and helps ensure a predictable, safer bulb operating life. More on OTP here.


  • 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 Dialog's 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 to SSL Industry Standards
    • Zhaga Hot-Plug Standard
    • NEMA SSL6 Dimming Standard for Incandescent Replacement
  • Fully Protected
    • Works from DC Voltage Emergency Back Up System
    • NTC-based Temperature Derating Circuit
    • Over-Voltage/Over-Temperature Protection
    • Output Over-Voltage, Over-Current 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

Block Diagrams

Typical Applications Diagram
Functional Block Diagram

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