Skip to main content


3-in-1 Secondary-Side Signal Interface Controller


Supports 0-10V Analog, PWM, Resistor Dimming

The iW337 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 iW337 converts any of these three signals into a 1%–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

  • 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% to 100% PWM Output

  • 1% PWM Duty Cycle Tolerance
  • Selectable Frequency Range via External Capacitor

Shutdown Pin to Minimize Standby Power


0-10V Analog or PWM LED Dimming

Resistor LED Dimming

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

Stay connected

Get in touch with us directly through our worldwide sales offices, or contact one of our global distributors and representatives.

Inquiries Distributors and Representatives Register for newsletters
Product Briefs and Summaries
Name Date Version
iW337 Product Summary (325.68 KB) 20/03/2018 1.0
Name Date Version
iW337 Datasheet (675.3 KB) (Registered users only) 19/03/2018 1.0
Application notes
Name Date Version
Application Note 2101 - 0-10V Analog Dimming (337.21 KB) (Registered users only) 10/03/2017 1.0
Reference designs
Name Date Version
Reference Design EBC20051: iW3631-00 and iW337-30, 90V-305V Input Voltage, 40W 0-10V Dimmable External LED Driver Design (4.29 MB) (Registered users only) 21/02/2018 1.0
Reference Design EBC20052: iW3637-01 and iW337-30, 300V-400VDC Input, 120V/500mA Output, 0-10V Dimmable High Voltage Buck SSL Design (4.11 MB) (Registered users only) 29/06/2018 1.0