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Digital PWM Controller Offers Peak Power Mode, Eliminating Need to Oversize Power Supply


Off-line digital quasi-resonant PWM controller with peak power operation

The iW1770 offers a compact solution for power supplies that need to provide short bursts of output power up to 60W, without oversizing the power system board components and cost.  With an average output up to 40W, the iW1770 adds a second, higher peak current limit, allowing power supplies to provide a momentary peak current pulse from the output without entering constant current mode.  This optimizes adapter cost and size by enabling a much higher peak output power, while maintaining the same external components used for the lower, nominal system output power.

The iW1770 meets the US DoE’s external power supply standard and the EU’s Code of Conduct, version 5, tier 2 standard, with no-load power consumption less than 50mW while complying with active mode efficiency requirements.  Additional features include fast dynamic load response (DLR), and a full set of protection features including output over-current, over-voltage and short-circuit protection.

The iW1770 also incorporates Dialog’s SmartDefender™ smart hiccup technology to help address soft short circuits in cables and connectors.

A DiaSIMTM simulation model is available for the iW1770. For more information and where to download, please visit the DiaSIMTM page.

Lifecycle status

● Active


40W average, 60W peak output power for AC/DC power supplies

  • No increase in component size to accommodate peak output power

Meets DoE External Power Supply and EU Code of Conduct, Version 5, Tier 2 Standards

  • Less than 50mW No-Load Power Consumption

Active Start-Up - Reduces Turn-on Time without Impacting No-load Power Consumption

High Nominal Output Power : 15W to 40W

Selectable Cable Drop Compensation: 0mV, 75mV, 150mV, 300mV, 450mV

  • Selectable via single resistor

PrimAccurateTM- Primary-Side Control, No Optocoupler Needed

Adaptive Multi-Mode PWM/PFM Control for Optimal Efficiency Across Load Range

No Audible Noise Over Entire Operating Range

EZ-EMITM Design to Easily Meet Global EMI Specifications

Fast Dynamic Load Response

SmartDefender™ Smart Hiccup Technology

  • Helps Address Soft-Shorts in Cables, Connectors without Latching Off
  • Helps Protect Cables and Connectors from Excessive Heat and Damage by Reducing Average Power During Short Circuit by at Least 50%

Fully Protected from Fault Conditions

  • Over-Voltage/Over-Temperature Protection
  • Output Short Circuit
  • Sense-Resistor Short Circuit Protection


Network devices, printers, home electronics

Ultrabook power supplies

Universal input AC/DC adapters (15W-40W)

     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.


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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Product Briefs and Summaries
Name Date Version
iW1770 Product Summary (411.66 KB) 15/07/2016 1.1
Name Date Version
iW1770 Datasheet (928.6 KB) (Registered users only) 15/07/2016 1.1
DiaSIM Simulation Tools
Name Date Version
iW1770-00-B DiaSIM™ Model (320.71 KB) (Registered users only) 26/09/2018 1.0
iW1770-00-B DiaSIM™ Simulation Circuit 40W Peak Power Network Adapter (720.21 KB) (Registered users only) 26/09/2018 1.0
iW1770-03 DiaSIM™ Simulation Circuit 40W Peak Power Network Adapter (720.02 KB) (Registered users only) 26/09/2018 1.0
iW1770-03 DiaSIM™ Simulation Model (319.61 KB) (Registered users only) 26/09/2018 1.0
NL5 Quick Start Guide (4.04 MB) 16/09/2016 1.0
Reference designs
Name Date Version
Reference Design EBC10059: iW1770-00 12V/1A Peak Current Power Adapter Design Application (2.47 MB) (Registered users only) 02/11/2015 1.0
Reference Design EBC10060: iW1770-00 12V/2A Networking Power Adapter Design Application (2.55 MB) (Registered users only) 02/11/2015 1.0
White Papers & Technical Articles
Name Date Version
White Paper : International External Power Supply Regulations (219.09 KB) (Registered users only) 01/09/2014 A