The iW1699 is a high-performance AC/DC controller designed to drive an external power N-channel MOSFET for peak current mode PWM flyback power supplies. It uses Renesas' PrimAccurate™ primary-side control technology, eliminating the need for a secondary-side regulator and optocoupler, reducing component count and solution cost while easily meeting the US DoE’s external power supply efficiency standard and the EU’s Code of Conduct, Version 5, Tier 2 external power supply standard, with no-load power consumption less than 30mW.

It integrates a constant current mode on some options so it can be used in adapter applications, with a constant current accuracy >3%. Additional features include Renesas' proprietary EZ-EMI™ technology, adaptive multi-mode PWM/PFM control for optimal efficiency across all loads, five selectable cable and connector voltage drop compensation voltages, and robust operation with full protection from overvoltage and over-temperature.

For lower output ripple, see the iW1699B 30W AC/DC off-line controller page.


  • Meets DoE external power supply regulation and EU CoC Version 5, Tier 2
    • Less than 30mW no-load power consumption
  • Active start-up - Reduces turn-on time without impacting no-load power consumption
  • Low 6µA start-up current
  • Selectable voltage offset compensation for voltage loss in cables and connectors (5 options)
    • Selectable via single resistor to ground
  • PrimAccurate™ - Primary-side control, no optocoupler needed
  • Intrinsically low noise solution - No audible noise over entire operating range
  • Adaptive multi-mode PWM/PFM control for optimal efficiency across load range
  • EZ-EMI™ design to easily meet global EMI specifications
  • Fast dynamic load regulation
  • Fully protected from fault conditions
    • Overvoltage/Over-temperature protection (latch option)
    • Output overvoltage and overcurrent
    • Input undervoltage protection
    • Sense-resistor short circuit protection



  • Power adapters for portable electronics
  • Consumer electronics power supplies
  • Linear AC/DC power supply replacement


PDF 466 KB Product Brief
PDF 5.51 MB 日本語 Brochure
PDF 1021 KB Datasheet
ZIP 2.44 MB Other
ZIP 3.19 MB Other
ZIP 2.59 MB Other
ZIP 1.81 MB Other
PDF 597 KB White Paper
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Design & Development