iW1762

iW1762

PrimAccurate™ High-Performance N-Channel MOSFET Digital PWM Controller for Networking Adapters

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Selectable cable drop compensation

The iW1762 is a high performance AC/DC controller designed to drive an external power N-channel MOSFET for peak current mode PWM flyback power supplies.  Optimized for power supplies with output power between 15W- 24W, the iW1762 is ideal for power adapters in networking equipment and monitors.

The iW1762 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 while complying with active mode efficiency requirements. As a PrimAccurate™ controller the iW1762 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, adaptive multi-mode PWM/PFM control for optimal efficiency across all loads, 5 selectable cable and connector voltage drop compensation voltages, robust operation with full protection from over-voltage and over-temperature.

For information on the iW1762 Ultrabook™ solution, see the reference designs page.

Features

  • Meets Proposed Mandatory Federal Efficiency Standards for External Power Supplies1
  • Meets Energy-Star® AC-DC Power Supply Efficiency Specs (Rev 2.0)
    • Less than 50mW No-Load Power Consumption
  • Active Start-Up Reduces Turn-on Time without Impacting No-load Power Consumption
  • Optimized for an Output Power Range of 15W to 24W
  • Ultra-low 300uA Operating Current at No-Load
  • 79kHz PWM Switching Frequency
  • Selectable Voltage Offset Compensation for Voltage Loss in Cables and Connectors (5 Options)
    • Selectable via single resistor to ground

Features

  • PrimAccurate™- Primary-Side Control, No Opto-Coupler Needed
  • Intrinsically Low Noise Solution - No Audible Noise Over Entire Operating Range
  • Adaptive Multi-Mode PWM/PFM Control for Optimal Efficiency Across Load Range
  • EZ-EMI™ Design to Easily Meet Global EMI Specifications
  • Fast Dynamic Load Regulation
  • Fully Protected from Fault Conditions
    • Over-Voltage/Over-Temperature Protection
    • Output Over-Voltage and Over-Current
    • Input Undervoltage Protection
    • Sense-Resistor Short Circuit Protection

Applications

  • Power Adaptors for Network Devices and Monitors
  • AC/DC Power Supplies in Home Electronics
  • Optimized for Universal Input Power Supplies (15W-24W)

Block Diagrams

Typical applications diagram
,
Functional block diagram

Resources

Product Briefs and Summaries
Date Version
iW1762 Product Brief 19/06/2012 Rev. 0.6
White Papers & Technical Articles
Date Version
What is Digital Power White Paper

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