The iW1691 is a high-performance AC/DC controller designed to drive an N-channel power MOSFET for peak current mode PWM flyback power supplies. Ideal for power adapters for applications such as mobile computing and communications and standby power supplies in consumer electronics, the iW1691 meets the US DoE's external power supply standard and the EU's Code of Conduct, Version 5, Tier 1 efficiency standard with no load power consumption less than 100mW. 

As a PrimAccurate™ controller, which uses primary-side control algorithms, the iW1691 does not need any direct secondary-side feedback components, eliminating the need for optocouplers, and reducing component count and solution cost. Additional features include Renesas' proprietary EZ-EMI™ technology, quasi-resonant control for optimal efficiency at heavy loads, cable and connector voltage drop compensation options, and full protection from fault conditions, including an over-temperature protection feature with and without a latching option. The iW1691 comes in several different combinations of cable compensation voltage (0mV to 400mV) and protection features.

For improved performance, see the iW1699B 30W AC/DC off-line controller page.


  • Meets DoE external power supply and EU Code of Conduct Version 5, Tier 1 standards
    • <100mW no-load power consumption
  • Low 10µA start-up current
  • 130kHz PWM switching frequency
  • PrimAccurate™ - Primary-side control, no optocoupler needed
  • Quasi-resonant control for optimal efficiency
  • Fast dynamic load regulation
  • Fully protected from fault conditions
    • Output overvoltage
    • Sense resistor short circuit protection
    • Over-temperature and overvoltage protection (latchable)
    • Input undervoltage and overvoltage protection




  • AC/DC power adapters for cell phones and digital still cameras
  • Standby power supply for consumer electronics - DVD players, set-top boxes


Type Title Date
Datasheet PDF 1.88 MB
Brochure PDF 8.73 MB
Brochure PDF 5.49 MB 日本語
Product Brief PDF 2.97 MB
White Paper PDF 597 KB
5 items

Design & Development