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iW1677

PrimAccurate™ Off-Line Digital PWM Controller in a SOT-23 Package

iw1677typicalapplicationsdiagram.jpg

< 20mW standby power

The iW1677 is a high performance AC/DC controller designed to drive a low-cost BJT power switch in peak current mode PWM flyback power supplies up to 5W. Ideal for power adapters for smartphones, the iW1677 integrates Dialog’s PrimAccurate™ digital primary-side control, eliminating the need for the secondary-side optocoupler, reducing component count and solution cost.

The iW1677 integrates an active start-up circuit that allows for fast turn-on without impacting operating current consumption.  The device easily 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 20mW.  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.

Features

Meets Proposed Mandatory Federal Efficiency Standards for External Power Supplies1

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

Easily Meets Energy-Star® AC/DC Power Supply Efficiency Specs (Rev 2.0)

  • Less than 20mW No-Load Power Consumption

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

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

Applications

Power Adapters for Portable Electronics

Consumer Electronics Power Supplies

Linear AC/DC Power Supply Replacement

Block Diagrams

iw1677typicalapplicationsdiagram.jpg

Typical applications diagram

iw1677functionablockdiagram.jpg

Functional block dirgram

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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Datasheets
Name Date Version
iW1677 Datasheet (756.11 KB) 03/06/2016 2.0
Reference designs
Name Date Version
Reference Design EBC10021: iW1677-00 5V/2A, 90-264VAC, 30mW No-Load Travel Adapter Design (3.03 MB) (Registered users only) 11/01/2016 1.0
White Papers & Technical Articles
Name Date Version
What is Digital Power White Paper (597.24 KB)