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15W AccuSwitch™ AC/DC Digital Primary-Side Switcher Eliminates Optocoupler and Maintains Excellent Cross-Regulation Accuracy


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. 

Lifecycle status

● Active


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)

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


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

AC/DC Power Supplies for Home Appliances, Industrial Electronics

Block Diagrams


Typical application diagram


Functional block diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

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Name Date Version
iW1820 Datasheet (1.45 MB) 17/06/2020 1.4
Reference designs
Name Date Version
Reference Design EBC10226: iW1820-31 and iW673-20 5V/3A Travel Adapter Design (2.38 MB) (Registered users only) 22/01/2022 2.0