3-in-1 Secondary-Side Signal Interface Controller with Optimized Output Drive

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Supports 0-10V Analog, PWM, Resistor Dimming

The iW339 is a secondary-side PWM signal generator that works with three types of dimming inputs: PWM dimming, 0-10V linear dimming, or simple dimming using a single resistor to ground from the DIM pin. The iW339 converts any of these three signals into a 1%–100% PWM duty cycle output that provides a dimming signal to a primary-side LED driver such as the iW3636, eliminating the need for transformers or other driver circuitry.


  • Operating Range: 15V to 60V
  • 3-in-1 Dimmer Interface
    • 0-10V Analog
    • PWM (10V)
    • Resistor
  • Highly Integrated for Low BOM Cost
    • Integrated Current Source for Driving 0-10V Dimmers
    • Integrated Optocoupler Driver for Isolated Applications


  • 1% PWM Duty Cycle Tolerance
  • Selectable Frequency Range via External Capacitor
  • Shutdown Pin to Minimize Standby Power


  • 0-10V Analog Dimming
  • PWM LED Dimming
  • Resistor LED Dimming

Block Diagrams

iW339 Typical Applications Diagram
iW339 Functional Block Diagram


Product Briefs and Summaries
Date Version
iW339 Product Summary 20/03/2018 Rev. 0.3

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