How to design an efficient offline auxiliary power supply hands-on workshop

Tuesday, November 21st 2017, Lyon, France

Join ST and Würth Elektonik workshop to learn how to design an efficient offline auxiliary power supply for low-medium output power with proper component selection.

STMicroelectronics & Würth Elektronik invite you to this hands-on workshop that will examine the theory, component selection and PCB layout to ensure the best design for the following topologies:

  • Low-power buck topology for mains applications
  • Medium-power quasi-resonant flyback topology for power converters

Discover how eDesignSuite, ST’s easy-to-use on-line design tool, helps you rapidly select and determine the optimal configuration for your power management design; reducing your final cost and improving your time to market.

Benefits you will take away

  • Technical overview of buck and quasi-resonant flyback topologies
  • Live session using eDesignSuite to analyze the impact of various components on circuit voltages and currents to determine the best design for your application
  • Live session using an oscilloscope to observe waveforms in real-time to study circuit voltages and currents and how they affect your application
  •  Tips and tricks to ensure the best PCB layout for your application

There is no charge to participate in this event, but you must register through

If you already have a myST account, REGISTER here.

If you do not have a myST account, click here to create your account and register.


  • Technical English and basic knowledge of electronic systems and devices
  • Please bring your laptop (Wi-Fi capable) with Microsoft Excel or compatible software installed
  • It is recommended to create your eDesignSuite account before the workshop to save time.


8:30 Registration
8:45 Introduction
9:00 Buck and flyback topology for mains applications in auxiliary supplies
VIPer introduction: ST’s family of offline monolithic converters
How to select other power components (diodes, protection ICs, etc.)

Live session: eDesignSuite for easy design

  • Typical drain-source voltage 
  • Inductor and transformer parameters that impact drain current 
  • Continuous vs. discontinuous mode 
  • Impact of different diodes
Tips and tricks for a high-quality, cost-effective PCB layout
10:30 Coffee break
10:45 Power inductors for high-voltage buck converters
Inductors with guaranteed high-voltage rating – technology and testing
Input EMI filters

Hands on session: eDesignSuite with Viper01/6 fixed-frequency high-voltage converter

  • Buck converter design 
  • Flyback converter design 
Open discussion about design issues and solutions
12:30 Lunch
13:45 Design considerations for quasi-resonant flyback converters
Benefits of ST’s new STCH02 quasi resonant controller for medium power converters
How to select other power components (main switches, diodes, protection ICs, etc.)

Live session: Using oscilloscope waveforms to better understand

  • Drain-source voltage – reflected voltage and leakage inductor spikes 
  • Quasi-resonant zero-voltage switching on drain-source voltage
  • Drain current – Peak current independence on input voltage
  • Secondary current (how it is complementary to primary) 
Tips and tricks for a high-quality, cost-effective PCB layout
15:15 Coffee break
15:30 Transformers for flyback converters
Getting the most out of EMI filters for flyback converters
16:15 Hands-on session: Quasi-resonant flyback design with STCH02
Open discussion about design issues and solutions
16:45 Conclusions & Summary

Location and date

City Date Status
Lyon, France           November 21, 2017        Open