iW1820

15W 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 5Vout

  The iW1820 AccuSwitch™ digital PWM controller 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 15W 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 <30mW of no-load power consumption to meet global energy efficiency regulations.

  

  Features

  • 15W Output, Optimized for 5Vout

  • 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

    • <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)

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  • 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

  Applications

  • Power Adapters/Chargers for Media Tablets, Smartphones, Consumer Electronics

  • AC/DC Power Supplies for Home Appliances, Industrial Electronics

  [1]  https://www.dialog-semiconductor.com/products/power-conversion/acdc-embedded/iw1820