900V AccuSwitch™ AC/DC Digital Primary-Side Converter for Industrial Applications up to 18W

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Excellent Cross Regulation and No Optocoupler Needed Optimizes System Cost

AccuSwitch™ digital PWM controller integrates a highly accurate control circuit with a 900V BJT power switch to provide a complete solution for off-line power conversion at up to 18W of output power.

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

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 <30mW of no-load power consumption to meet global energy efficiency regulations.


  • 18W Output
  • AccuSwitch™ integrated 900V Power BJT
  • PrimAccurate™ Primary-Side Control
    • No Optocoupler Needed
  • Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation
  • Meets Global Energy Efficiency Standards
    • <30mW No-Load Power Consumption
  • Quasi-resonant Control for Optimal Efficiency
  • Adaptively Controlled Soft Start-up
  • Fast, Smooth Start-up into Large Capacitive Loads (up to 6,000µF)
  • EZ-EMI™ Design
    • Reduces Filtering Requirements
    • Easily Meets Global EMI Specifications
  • Fully Protected from Fault Conditions
    • Built-In Over-Temperature Protection
    • Output Over-Voltage and Over-Current Protection
    • Sense-Resistor Short Circuit Protection
    • Thermally Efficient SO-10 Batwing Package


  • Smart Electricity Meters
  • Industrial Applications

Block Diagrams

Typical Applications Diagram
Functional Block Diagram


Product Briefs and Summaries
Date Version
iW1822 Product Summary 17/06/2020 Rev. 0.3

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