AN2020-39 62.5W auxiliary power supply for three-phase power converter Using the 1700 V CoolSiC MOSFET About this document Scope and purpose This document demonstrates the solution for high input voltage DC link 62.5 W auxiliary power supply designs using Infineons 1700 V CoolSiC MOSFET in TO-263 7 package (IMBF170R1K0M1) in a single-ended flyback topology. The reference board can support designers targeting three-phase converters that includes solar inverter, energy storage, EV-charger, UPS and motor drives. Sales product name: REF 62W FLY 1700V SIC Intended audience Design engineers designing auxiliary power supply designs in three-phase converters and with Infineon CoolSiC MOSFET. Important Notice Environmental conditions have been considered in the design of the Evaluation and Reference Boards provided by Infineon Technologies. The design of the Evaluation and Reference Boards is tested by Infineon Technologies only as described in this document. The design is not qualified in terms of safety requirements, manufacturing and operation over the entire operating temperature range or lifetime. The Evaluation and Reference Boards provided by Infineon Technologies are subject to functional testing only under typical load conditions. Evaluation and Reference Boards are not subject to the same procedures as regular products regarding returned material analysis (RMA), process change notification (PCN) and product discontinuation (PD). Evaluation and Reference Boards are not commercialized products and are solely intended to be used for evaluation and testing purposes. They shall not be used for reliability testing or production. Hence, the Evaluation and Reference Boards may not comply with CE or similar standards (including but not limited to the EMC Directive 2004/EC/108 and the EMC Act) and may not fulfill other requirements of the country in which they are operated by the Customer. The Customer shall ensure that each Evaluation and/or Reference Board will be handled in a way which is compliant with all relevant requirements and standards in the country in which they are operated. The Evaluation and Reference Boards are addressed only to qualified and skilled technical staff, for laboratory usage, and shall be used and managed according to the terms and conditions set forth in this document and in any other related documentation provided with the respective Evaluation or Reference Board. It is the responsibility of the Customers technical staff to evaluate the suitability of the Evaluation and Reference Boards for the intended application and the completeness of the Evaluation and Reference Board information provided in this document with respect to such application. The Customer accepts that the Evaluation and Application Note Please read the Important Notice and Warnings at the begining of this document V 1.0 www.infineon.com page 1 of 23 2020-03-12 62.5W auxiliary power supply for three-phase power converter Using the 1700 V CoolSiC MOSFET Reference Boards are not intended to be used for life-endangering applications such as medical, nuclear, military, life-critical or other applications, where failure of the Evaluation and Reference Boards or any results from the use thereof can reasonably be expected to result in personal injury. Evaluation and Reference Boards are providedAS I. Infineon Technologies disclaims any and all warranties, express or implied, including but not limited to warranties of non-compliance with any specification, non- infringement of third party rights and implied warranties of fitness for any purpose, or for merchantability. Infineon Technologies shall not be responsible for any damages resulting from the use of the Evaluation and Reference Boards. Customer is obliged to defend, indemnify and hold Infineon Technologies harmless from and against any claims or damages arising out of or resulting from any use of the Evaluation and Reference Boards. Table of Contents About this document ....................................................................................................................... 1 Important Notice ............................................................................................................................ 1 Table of Contents ........................................................................................................................... 2 1 Safety precautions ................................................................................................................. 3 2 Introduction .......................................................................................................................... 4 3 Board overview ...................................................................................................................... 5 3.1 Board features ......................................................................................................................................... 5 3.2 1700 V CoolSiC MOSFET overview ........................................................................................................ 5 3.3 External gate resistor selection guide .................................................................................................... 6 4 Reference board specifications and descriptions ....................................................................... 8 4.1 Board pictures ......................................................................................................................................... 8 4.2 The technical specification of board ...................................................................................................... 9 4.3 Schematic .............................................................................................................................................. 10 4.4 PCB layout ............................................................................................................................................. 11 4.5 Bill of material ....................................................................................................................................... 13 4.6 Transformer construction ..................................................................................................................... 15 5 Test results ........................................................................................................................... 17 5.1 Efficiency result ..................................................................................................................................... 17 5.2 Waveforms ............................................................................................................................................. 18 5.3 Thermal performance ........................................................................................................................... 19 6 References ........................................................................................................................... 22 Revision History ............................................................................................................................ 22 Application Note page 2 of 23 V 1.0 2020-03-12