EVAL40W19VFLYBP7TOBO2 Infineon

AN 201701 PL52 007 40 W adapter demo board Using the new 700 V CoolMOS P7 and ICE2QS03G quasi -resonant PWM controller Author: Jared Huntington Scope and purpose The demo board described in this application note provides a test platform for the new 700 V CoolMOS P7 series of high voltage MOSFETs. The adapter uses the ICE2QS03G, a second generation current mode control quasi-resonant flyback controller and an IPA70R600P7S 700 V CoolMOS P7 series power MOSFET. This application note is intended for those that have experience with flyback converter designs and will not go in depth regarding the overall design process, but will cover specific design aspects for this controller and 700 V CoolMOS P7 in charger and adapter applications. It will also look at the overall benefits that the 700 V CoolMOS P7 presents for switch mode power supplies. For a detailed introduction on flyback converter design please read Design guide for QR Flyback converter 1 . Intended audience Power supply design engineers Table of contents 1 Description ................................................................................................................... 2 2 Quasi-resonant flyback overview .................................................................................... 3 3 ICE2QS03G functional overview ...................................................................................... 4 4 P7 700 V CoolMOS benefits for adapters ......................................................................... 5 5 Design considerations .................................................................................................... 7 5.1 700 V MOSFET and design changes ........................................................................................................ 7 5.2 UVLO circuit ........................................................................................................................................... 12 6 Demo board overview ................................................................................................... 14 6.1 Demo board pictures ............................................................................................................................ 14 6.2 Demo board specifications ................................................................................................................... 14 6.3 Demo board features ............................................................................................................................ 15 6.4 Schematic .............................................................................................................................................. 16 6.5 BOM with Infineon components in bold ............................................................................................... 17 6.6 PCB layout ............................................................................................................................................. 19 6.7 Transformer construction ..................................................................................................................... 20 7 Measurements .............................................................................................................. 21 7.1 High line and low line operation ........................................................................................................... 21 7.2 Thermal performance under typical operating conditions ................................................................. 11 8 Conclusion ................................................................................................................... 23 9 References ................................................................................................................... 24 Application Note Please read the Important Notice and Warnings at the end of this document Revision 1.0 www.infineon.com/p7 2017-01-20 40 W adapter demo board Using the new 700 V CoolMOS P7 and ICE2QS03G quasi-resonant PWM controller Description 1 Description This 40 W adapter demo board is intended to be a form, fit, and function test platform for charger and adapter applications to show the operation of the 700 V CoolMOS P7 as well as the overall controller design. The demo board is designed around a quasi-resonant flyback topology for improved switching losses that allows higher power density designs and lower radiated and conducted emissions. A 40 W universal input isolated flyback demo board with a 19 V output based on the ICE2QS03G controller and the CoolMOS P7 MOSFET is described in this application note and some test results are presented. Figure 1 40 W flyback demo board Application Note 2 Revision 1.0 2017-01-20