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

Renesas' 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, overvoltage and overcurrent 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 Overvoltage and Overcurrent
    • Sense-Resistor Short Circuit Protection Application
  • Thermally Efficient PDIP-7 Package to Support High Power





Type Title Date
Product Brief PDF 617 KB
Brochure PDF 5.49 MB 日本語
Datasheet Log in to Download PDF 1012 KB
Other Log in to Download ZIP 2.51 MB
Other Log in to Download ZIP 1.29 MB
Other Log in to Download ZIP 1.31 MB
White Paper Log in to Download PDF 766 KB
White Paper Log in to Download PDF 279 KB
Manual - Development Tools PDF 3.96 MB
9 items

Design & Development

Software & Tools

Software & Tools

Software title
Software type
DiaSIM™ Simulation Models
DiaSIM simulation models let the user test and validate AC/DC power supply designs prior to prototyping.
Simulator Renesas
1 item