IRAC27951SR Infineon

Energy Saving Products 101 N.Sepulveda Blvd, EL Segundo 90245 California, USA IRAC27951SR IRS27951 Evaluation Board User Guide Rev. 4.1 6/1/2011 International Rectifier Page 1 of 23 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed to others for manufacture or any other purpose except as specifically authorized in writing by INTERNATIONAL RECTIFIER. Table of Contents 1 INTRODUCTION ........................................................................................................................ 3 2 IRS27951/2 DESCRIPTION ....................................................................................................... 3 3 IR11682 DESCRIPTION ............................................................................................................ 4 4 EVALUATION BOARD SPECIFICATIONS ................................................................................ 5 4.1 Board Description ................................................................................................................... 5 4.2 Schematic ............................................................................................................................... 6 4.3 Evaluation Board Picture ........................................................................................................ 7 4.4 Board Component Placement ................................................................................................. 7 4.5 Board PCB Layout .................................................................................................................. 8 4.6 Bill of Materials ....................................................................................................................... 9 5 EVALUATION BOARD OPERATING PROCEDURE ............................................................... 10 5.1 Load Connection................................................................................................................... 10 5.2 AC/DC Input ......................................................................................................................... 10 5.3 IRS27951 DC Supply Voltage .............................................................................................. 11 5.4 Disconnect the Board ........................................................................................................... 11 6 SYSTEM PERFORMANCE CHARACTERIZATION ................................................................ 12 6.1 Steady-State and Start-up Waveforms ................................................................................. 12 6.2 Synchronous Rectifier Waveform ......................................................................................... 15 6.3 Dynamic Load Response & Output Voltage Regulation ....................................................... 16 6.4 Output Ripple ........................................................................................................................ 19 6.5 User Initiated SLEEP Mode .................................................................................................. 20 6.6 Efficiency Chart..................................................................................................................... 21 6.7 Thermal Data ........................................................................................................................ 22 7 Transformer Spec..................................................................................................................... 22 7.1 Electrical Diagram ................................................................................................................. 22 7.2 Resonant Transformer Winding Position on Coil former ....................................................... 23 7.3 Resonant Transformer Winding Characteristics ................................................................... 23 Rev. 4.1 6/1/2011 International Rectifier Page 2 of 23 PROPRIETARY INFORMATION - This document and the information contained therein are proprietary and are not to be reproduced, used or disclosed to others for manufacture or any other purpose except as specifically authorized in writing by INTERNATIONAL RECTIFIER.