iW1819

18W AccuSwitch™ AC/DC Digital Primary-Side Switcher Eliminates Optocoupler and Maintains Excellent Cross-Regulation Accuracy

72kHz integrated 800V BJT

The iW1819 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 18W 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

• 18W Output

• 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

Applications

• Networking Equipment

• Set Top Boxes

• Home Appliances

• Smart Meters

Datasheets