iWatt, Inc. - iW1810

Description
The iW1810 is a high performance AC/DC converter with an integrated 800V power Bipolar Junction Transistor (BJT). Capable of 3.5W maximum output power, the iW1810 operates in a quasi-resonant mode to optimize efficiency and it also incorporates a power saving mode that guarantees less than 100mW of power consumption at no load, ideal for applications such as energy standard compliant home appliances. The iW1810 also incorporates iWatt's PrimAccurate™ primary-side digital control algorithms that enable a fully isolated solution without the need for an opto-isolator, reducing cost and solution size while greatly improving reliability. Additional functionality includes full protection from over temperature, over voltage and over current conditions as well as EZ-EMI^® design techniques to allow for a solution that easily meets global EMI specifications.
Typical Applications Diagram
Low Power Off-Line Power Supply
Related Technical Documents
What is digital power and what are its benefits? By Zahid Rahim EE Times Power Management DesignLine September 16, 2010 AC/DC Power Supply Considerations for Home Appliances By Zahid Rahim ECN Magazine May 13, 2011 Real Time Waveform Analysis Helps Optimize Charger Performance By Jerry Zehng, Yong Li, and Zahid Rahim Power Electronics Technology March 1, 2011 Why consider a power BJT rather than a MOSFET? By Yong Li, PhD EE Times Power Management DesignLine October 25, 2010

Features
Integrated 800V Power BJT 3.5W Output Power Range Capable 64kHz PWM Switching Frequency Easily Meets Energy-Star^® AC/DC Power Supply Efficiency Specs (Rev 2.0) Less than 100mW No-Load Power Consumption Low 8uA Start-Up Current 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 Output Over-Voltage and Over-Current Input Undervoltage Protection Sense-Resistor Short Circuit Protection
Functional Block Diagram

Applications
Smart Meters Motor Control Industrial Power Supplies Home Automation and Appliances