The iW337 is a secondary-side PWM signal generator that works with three types of dimming inputs: PWM dimming, 0V to 10V linear dimming, or simple dimming using a single resistor to ground from the DIM pin. The iW337 converts any of these three signals into a 1% to 100% PWM duty cycle that provides a dimming signal to a primary-side LED driver such as the iW3631, eliminating the need for transformers or other driver circuitry.


  • Operating range:15V to 60V
  • 3-in-1 dimmer interface
    • 0V to 10V analog
    • PWM (10V)
    • Resistor
  • Highly integrated for low BOM cost
    • Integrated current source for driving 0V to 10V dimmers
    • Integrated optocoupler driver for isolated applications
  • 1% to 100% PWM output
    • 1% PWM duty cycle tolerance
    • Selectable frequency range via external capacitor
  • Shutdown pin to minimize standby power




  • 0V to 10V analog or PWM LED dimming
  • Resistor LED dimming


Type Title Date
Product Brief PDF 427 KB
Brochure PDF 5.51 MB 日本語
Datasheet PDF 648 KB
Application Note PDF 590 KB
Other ZIP 4.11 MB
5 items

Design & Development