12W AccuSwitch™ AC/DC Digital Primary-Side Switcher Eliminates Optocoupler and Maintains Excellent Cross-Regulation Accuracy

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72kHz integrated 800V BJT optimized for 12Vout

The iW1818 AccuSwitch™ digital PWM converter integrates a highly accurate control circuit with an 800V BJT power switch to provide a complete solution for off-line power conversion at up to 12W of output power.

Dialog's PrimAccurate™ primary-side digital control algorithms eliminate the need for failure-prone optocouplers and ensure excellent cross-regulation accuracy, to enable the longer operating lifetime, high performance and reduced cost required for white goods applications.

The output is designed to smoothly start-up into large capacitors while maintaining a quick turn-on time.  It operates in quasi-resonant mode to optimize efficiency and incorporates a low-power mode that achieves <50mW of no-load power consumption to meet global energy efficiency regulations. Additional features include full protection from over-temperature, over-voltage and over-current conditions as well as EZ-EMI® technology to easily meet global EMI specifications.

A DiaSIM simulation model is available for the iW1818. For more information and where to download, please visit the DiaSIM page.


  • 10W – 12W Output Power
  • AccuSwitch™ - Integrated 800V Power BJT
  • PrimAccurate™ Primary-Side Control
    • No Optocoupler Needed
  • Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation
  • Meets Global Energy Efficiency Standards
    • < 50mW No-Load Power Consumption
    • Quasi-resonant Control for Optimal Efficiency


  • Adaptively Controlled Soft Start-up
  • Fast, Smooth Start-up Into Large Capacitive Loads
  • EZ-EMI™ Design to Easily Meet Global EMI Specifications
  • Fully Protected from Fault Conditions:
  • Over-Temperature Protection
  • Output Over-Voltage and Over-Current
  • Sense-Resistor Short Circuit Protection Application
  • Thermally Efficient PDIP-7 Package to Support High Power


  • Networking power for ADSL, wireless access points and routers
  • Home appliances
  • Set-top boxes

Model Available!

Block Diagrams

Typical application diagram
Functional block diagram

iW1818-EVAL Evaluation Board for 10W Single Output Power Supplies

The iW1818-EVAL evaluation board provides a solution for development of 10W single output power supplies for white goods, home appliances, industrial control equipment and network devices. It uses Dialog’s iW1818 AccuSwitch™ digital off-line power supply controller IC and supplies a 5V: 2A regulated output using a primary-side controlled, quasi-resonant flyback converter.  

Find out more and buy iW1818-EVAL Summary

IW1818 webfront


Product Briefs and Summaries
Date Version
iW1818 Product Summary 15/04/2016 Rev. 1.0
Evaluation boards
Date Version
IW1818-EVAL Summary 18/05/2016 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.

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