PrimAccurate™ Digital Off-Line Controller with <50mW No-Load Power Consumption for Power Supplies up to 12W

A team of engineers is ready to answer your questions

Off-line digital green-mode quasi-resonant PWM controller

The iW1709 digital off-line controller offers fast start-up into high capacitive loads, very low standby power consumption (<50mW) and a cost-optimized BOM, working with low-cost BJT power devices for off-line power supplies up to 12W.  By meeting the U.S. Department of Energy’s external power supply efficiency requirements and Version 5, Tier 2 of the EU’s Code of Conduct for external power supplies, the iW1709 fits ideally into home networking equipment, home appliances, wireless access points and set-top boxes.

Integrating Dialog's PrimAccurate™ and EZ-EMI® technologies enables easy-to-design solutions and reduces BOM cost by eliminating the need for an external optical feedback isolator.  The iW1709 also integrates cable drop compensation options, compensating for voltage drop in the cables and connectors, ensuring the proper voltage makes it to the load.  A full complement of protection features enables robust operation in the event of a short circuit, over-voltage, input under-voltage or over-temperature condition.

A DiaSIM simulation model is available for the iW1709. For more information and where to download, please visit the DiaSIM page.


  • Adaptively Controlled Soft Start-up - Fast and Smooth Start-up Into Large Capacitive Loads
    • Active Start-Up Circuit to Reduce Turn-On Time without Increasing No-Load Power
  • Meets Department of Energy and EU's CoC, Version 5, Tier 2 External Power Supply Efficiency Standards
    • Less than 50mW No-Load Power Consumption
  • Intrinsically Low Noise Solution - No Audible Noise Over Entire Operating Range
  • Cable Drop Compensation Options
  • PrimAccurate™ - Primary-Side Control, No Opto-Coupler Needed


  • Quasi-resonant Control for Optimal Efficiency
  • EZ-EMI® Design to Easily Meet Global EMI Specifications
  • Fast Dynamic Load Response
  • SOIC-8 Package
  • Fully Protected from Fault Conditions
    • Over-Temperature Protection
    • Output Over-Voltage and Over-Current
    • Input Undervoltage Protection
    • Sense-Resistor Short Circuit Protection


  • Networking Power Supplies for ADSL Modems, Wireless Access Points and Routers
  • Home Appliances
  • Set-Top Box

Model Available!

Block Diagrams

Typical applications diagram
Functional block diagram


Product Briefs and Summaries
Date Version
iW1709 Product Summary 06/01/2017 Rev. 1.0

Dialog’s DiaSIM simulation models and tools enable simulation and validation of AC/DC power supplies using highly accurate models for selected products. All models and application circuits are available for download from the support website.


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.