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12W AccuSwitch™ AC/DC Digital Primary-Side Switcher Eliminates Optocoupler and Maintains Excellent Cross-Regulation Accuracy


72kHz integrated 800V BJT optimized for 12Vout

The iW1818 AccuSwitch™ digital PWM converter integrates a highly accurate control circuit with an 800V BJT power switch to provide a complete solution for off-line power conversion at up to 12W of output power.

Dialog's PrimAccurate™ primary-side digital control algorithms eliminate the need for failure-prone optocouplers and ensure excellent cross-regulation accuracy, to enable the longer operating lifetime, high performance and reduced cost required for white goods applications.

The output is designed to smoothly start-up into large capacitors while maintaining a quick turn-on time. It operates in quasi-resonant mode to optimize efficiency and incorporates a low-power mode that achieves <50mW of no-load power consumption to meet global energy efficiency regulations. Additional features include full protection from over-temperature, over-voltage and over-current conditions as well as EZ-EMI® technology to easily meet global EMI specifications.

A DiaSIMTM simulation model (32-bit NL5 version only) is available for the iW1818. For more information and where to download, please visit the DiaSIMTM page.

Lifecycle status

● Active


10W – 12W Output Power

AccuSwitch™ - Integrated 800V Power BJT

PrimAccurate™ Primary-Side Control

  • No Optocoupler Needed

Intelligent Digital Control Loop for Accurate Voltage Cross-Regulation

Meets Global Energy Efficiency Standards

  • < 50mW No-Load Power Consumption
  • Quasi-resonant Control for Optimal Efficiency

Adaptively Controlled Soft Start-up

Fast, Smooth Start-up Into Large Capacitive Loads

EZ-EMI™ Design to Easily Meet Global EMI Specifications

Fully Protected from Fault Conditions:

Over-Temperature Protection

Output Over-Voltage and Over-Current

Sense-Resistor Short Circuit Protection Application

Thermally Efficient PDIP-7 Package to Support High Power


Networking power for ADSL, wireless access points and routers

Home appliances

Set-top boxes

     Model Available!

Block Diagrams


Typical application 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
iW1818 Product Summary (390.44 KB) 15/04/2016 1.0
Name Date Version
iW1818 Datasheet (1.05 MB) (Registered users only) 08/11/2019 1.2
DiaSIM Simulation Tools
Name Date Version
iW1818 DiaSIM™ Model (142.93 KB) (Registered users only) 19/09/2018 3.0
NL5 Quick Start Guide (4.13 MB)
Reference designs
Name Date Version
Reference Design EBC10077: iW1818-00 12V/700mA and 5V/150mA Dual Output Home Appliance Reference Design (2.51 MB) (Registered users only) 23/12/2021 2.0
Reference Design EBC10093: iW1818-00 5V/2A Single-Output Home Appliance Design (2.92 MB) (Registered users only) 24/12/2021 2.0
Reference Design EBC10095: iW1818-00 12V/500mA and 5V/1000mA Single-Output Home Appliance Design (1.32 MB) (Registered users only) 24/12/2021 2.0
White Papers & Technical Articles
Name Date Version
White Goods Power Supply Design White Paper (921.42 KB) (Registered users only) 01/05/2016 1.0
White Paper : International External Power Supply Regulations (219.09 KB) (Registered users only) 01/09/2014 A