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700V AccuSwitch™ AC/DC Digital Primary-Side Converter with Configurable Light Load Mode for Applications up to 25W


Enables Optimization for Fast DLR and No-Load Power

The iW1825 AccuSwitch™ digital PWM controller integrates a highly accurate control circuit with a 700V power MOSFET switch to provide a complete solution for off-line power conversion at up to 25W of output power.

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

The iW1825 has a configurable light load mode operation to enable optimization between no-load standby power and fast DLR. It can achieve <75mW at no load, with the fastest DLR setting and <30mW in the lowest setting. The iW676 synchronous rectifier controller with active voltage positioning can be used with the iW1825 to enable the lowest no-load standby power, fastest DLR and highest efficiency for 25W applications.

Lifecycle status

● Active


25W Output

AccuSwitch™ Integrated 700V Power MOSFET

PrimAccurate™ Primary-Side Control

  • No Optocoupler Needed

Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation

Meets Global Energy Efficiency Standards

Configurable Light Load Mode to Optimize No-Load Power Consumption and DLR

  • <30mW to <75mW No-Load Power Consumption

Works with the iW676 SR Controller with Active Voltage Positioning (AVP)

  • AVP – Enables <30mW No-Load Power Consumption and Fast DLR

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


Home Appliances

Power Adapters

Networking Power Supplies

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

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Product Briefs and Summaries
Name Date Version
iW1825 Product Summary (460.2 KB) 09/05/2022 1.3
Name Date Version
iW1825 Datasheet (3.36 MB) (Registered users only) 09/05/2022 1.3
Reference designs
Name Date Version
Reference Design EBC10232: iW1825-31, 90-264Vac Input Voltage, 12V/1.5A 18W Output Design (3.04 MB) (Registered users only) 26/12/2021 2.0