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iW1821

1200V AccuSwitch™ AC/DC Digital Primary-Side Converter for Three-Phase Industrial Applications up to 12W

iw1821_typical_applications_diagram_-_web.jpg

Excellent Cross Regulation and No Optocoupler Needed Optimizes System Cost

The iW1821 AccuSwitch™ digital PWM controller integrates a highly accurate control circuit with a 1200V 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 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 <50mW of no-load power consumption to meet global energy efficiency regulations.

Lifecycle status

● Active

Features

12W Output

AccuSwitch™ Integrated 1200V 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 (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

Applications

Three-Phase Smart Electricity Meters

Industrial Applications

Block Diagrams

iw1821_typical_applications_diagram_-_web.jpg

Typical Applications Diagram

iw1821_functional_block_diagram_-_web.jpg

Functional Block Diagram

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Product Briefs and Summaries
Name Date Version
iW1821 Product Summary (432.45 KB) 17/06/2020 0.3
Datasheets
Name Date Version
iW1821 Datasheet (1.57 MB) (Registered users only) 06/09/2021 0.7
Reference designs
Name Date Version
Reference Design EBC10241: iW1821-00 Three-Phase Input Voltage, 12V, 1A Output Design (3.74 MB) (Registered users only) 15/07/2020 1.0
Reference Design EBC10308: iW1821-00 Three-Phase Input Voltage, 12V, 0.8A Nominal, 1.5A Peak Output Design (2.94 MB) (Registered users only) 15/07/2020 1.0