PrimAccurate™ Zero No-Load Power Off-Line Digital PWM Controller in a SOT-23 Package

The iW1700 is a high performance AC/DC controller designed to drive an external power bipolar junction transistor (BJT) for peak current mode PWM flyback power supplies.  The iW1700 is a zero no-load power product, having less than 5mW of power consumption at no load, easily meeting the Energy-Star® specification for AC/DC single output power supplies (rev 2.0).   The virtually zero no-load power consumption makes it ideal for adapters in portable electronics and power supplies for consumer electronics.  The iW1700 also meets the proposed mandatory efficiency standards for external power supplies and battery chargers.  As a PrimAccurate™ controller, which use primary-side control algorithms, the iW1700 does not need any direct secondary-side feedback components, eliminating the need for opto-isolators, reducing component count and solution cost.  Additional features include Dialog's proprietary EZ-EMI™ technology, quasi-resonant control for optimal efficiency at heavy loads, cable and connector voltage drop compensation options, full protection from fault conditions and tiny packaging.  The iW1700 comes in four options, the iW1700-00 with zero voltage drop compensation, the iW1700-01 with a 300mV voltage drop compensation offset, the iW1700-03 with a 450mV voltage drop compensation offset and the iW1700-05, with 150mV of offset compensation.

1US Department of Energy, Regulatory Information Number RIN-1904-AB57

Typical Applications Diagram

Functional Block Diagram


  • Zero No-Load Power Consumption - Easily Meets Energy-Star® AC/DC Power Supply Efficiency Specs (Rev 2.0)
    • Less than 5mW at No-Load
  • Meets Proposed Mandatory Federal Efficiency Standards for External Power Supplies1
  • Low 1.7uA Start-Up Current
  • Active Start-Up Circuit to Reduce Turn-on Time
  • 72kHz PWM Switching Frequency
  • Voltage Offset Compensation for Voltage Loss in Cables and Connectors (4 Options)
  • PrimAccurate™ - Primary-Side Control, No Opto-Coupler Needed
  • Intrinsically Low Noise Solution - No Audible Noise Over Entire Operating Range
  • Quasi-resonant Control for Optimal Efficiency
  • EZ-EMI™ Design to Easily Meet Global EMI Specifications
  • Fast Dynamic Load Regulation
  • Fully Protected from Fault Conditions
    • Over-Temperature Protection
    • Output Over-Voltage and Over-Current
    • Input Undervoltage Protection
    • Sense-Resistor Short Circuit Protection


  • Power Adapters for Portable Electronics
  • Consumer Electronics Power Supplies
  • Linear AC/DC Power Supply Replacement

Power Adapters

Refer #Part #POUT (W)VOUT (V)IOUT (A)No Load Power