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PrimAccurate™ Digital Off-Line Controller with <50mW No-Load Power Consumption for Power Supplies up to 12W


Off-line digital green-mode quasi-resonant PWM controller

The iW1709 digital off-line controller offers fast start-up into high capacitive loads, very low standby power consumption (<50mW) and a cost-optimized BOM, working with low-cost BJT power devices for off-line power supplies up to 12W. By meeting the U.S. Department of Energy’s external power supply efficiency requirements and Version 5, Tier 2 of the EU’s Code of Conduct for external power supplies, the iW1709 fits ideally into home networking equipment, home appliances, wireless access points and set-top boxes.

Integrating Dialog's PrimAccurate™ and EZ-EMI® technologies enables easy-to-design solutions and reduces BOM cost by eliminating the need for an external optical feedback isolator. The iW1709 also integrates cable drop compensation options, compensating for voltage drop in the cables and connectors, ensuring the proper voltage makes it to the load.  A full complement of protection features enables robust operation in the event of a short circuit, over-voltage, input under-voltage or over-temperature condition.

A DiaSIM™ simulation model (32-bit NL5 version only) is available for the iW1709. For more information and where to download, please visit the DiaSIM™ page.

Lifecycle status

● Active


Adaptively Controlled Soft Start-up - Fast and Smooth Start-up Into Large Capacitive Loads

  • Active Start-Up Circuit to Reduce Turn-On Time without Increasing No-Load Power

Meets Department of Energy and EU's CoC, Version 5, Tier 2 External Power Supply Efficiency Standards

  • Less than 50mW No-Load Power Consumption

Intrinsically Low Noise Solution - No Audible Noise Over Entire Operating Range

Cable Drop Compensation Options

PrimAccurate™ - Primary-Side Control, No Opto-Coupler Needed

Quasi-resonant Control for Optimal Efficiency

EZ-EMI® Design to Easily Meet Global EMI Specifications

Fast Dynamic Load Response

SOIC-8 Package

Fully Protected from Fault Conditions

  • Over-Temperature Protection
  • Output Over-Voltage and Over-Current
  • Input Undervoltage Protection
  • Sense-Resistor Short Circuit Protection


Networking Power Supplies for ADSL Modems, Wireless Access Points and Routers

Home Appliances

Set-Top Box

     Model Available!

Block Diagrams


Typical applications diagram


Functional block diagram

DiaSIM logo

Dialog’s DiaSIM simulation models and tools enable simulation and validation of AC/DC power supplies using highly accurate models for selected products. All models and application circuits are available for download from the support website.

Important note: Dialog's DiaSIM models are only compatible with the 32-bit version of NL5.


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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Important note: Dialog's DiaSIM models are only compatible with the 32-bit version of NL5.

Product Briefs and Summaries
Name Date Version
iW1709 Product Summary (321.24 KB) 06/01/2017 1.0
Name Date Version
iW1709 Datasheet (711.53 KB) (Registered users only) 06/01/2017 1.0
DiaSIM Simulation Tools
Name Date Version
iW1709-00 DiaSIM™ Model (161.76 KB) (Registered users only) 03/03/2017 1.0
iW1709-01 DiaSIM™ Model (161.47 KB) (Registered users only) 03/03/2017 1.0
NL5 Quick Start Guide (4.13 MB)