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


< 5mW no-load standby power

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 US DoE’s external power supply standard and the EU’s Code of Conduct, version 5, tier 2, external power supply standard. The virtually zero no-load power consumption makes it ideal for adapters in portable electronics and power supplies for consumer electronics.

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 optocouplers, 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.

Lifecycle status

● Active


Zero No-Load Power Consumption - Easily Meets DoE External Power Supply and EU Code of Conduct, Version 5, Tier 2 Standards

  • 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 Optocoupler 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

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

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Inquiries Distributors and Representatives Register for newsletters
Name Date Version
iW1700 Datasheet (959.25 KB) 01/04/2020 1.7
Reference designs
Name Date Version
Reference Design EBC10010: iW1700-01 for Zero No-Load Power 5V/1A Mini Travel Adapter Design (1.87 MB) (Registered users only) 22/01/2022 2.0
White Papers & Technical Articles
Name Date Version
What is Digital Power White Paper (597.24 KB)