Digital Off-Line 40W PWM Controller with PrimAccurate™ Primary-Side Control for LED Driving

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Single-stage LED lighting up to 40W

The iW3620 is a high performance AC/DC power supply controller for applications up to 40W of output power, optimized for driving LEDs from an AC supply voltage. Designed to operate from a universal input voltage range of 85VAC to 264VAC, the iW3620 can be used across all voltage standards worldwide. 

The iW3620 uses Dialog's proprietary PrimAccurate™ primary-side control technology, minimizing the external component count by removing the need for both the traditional opto-isolator and external compensation components, reducing solution size and cost. The device operates in quasi-resonant mode in order to optimize efficiency at heavy loads and uses pulse-by-pulse waveform analysis to offer loop response characteristics superior to tranditional off-line solutions. The iW3620 is fully protected and incorporates Dialog's EZ-EMI® technology to facilitate EMI management in the end application, giving the end user an easy-to-design and robust solution for solid state lighting.


  • PrimAccurate™ - Isolated Off-Line AC/DC Controller
  • EZ-EMI®Design to Easily Meet Global EMI Specifications
  • Ideal for Off-Line LED Applications up to 40W
  • Universal Input Power Supply Range - 85VAC to 264VAC
  • Up to 130kHz Switching Frequency, Enables Small Adapters
  • Quasi-resonant Mode for Optimal Efficiency


  • Low 10uA Start-Up Current
  • Programmable Overtemperature Protection - External NTC Thermistor
  • Built-in Ouput Over Voltage Protection
  • Sense Resistor Short Circuit Protection
  • Open Circuit Protection


  • Solid State Lighting
  • 40W LED Luminaires

Block Diagrams

Typical Applications Diagram
Functional Block Diagram

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