Rev. 4.0 5/22/2010
International Rectifier
Page 2 of 16
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
EVALUATION BOARD SPECIFICATIONS ................................................................................ 4
3.1
Board Description ................................................................................................................... 4
3.2
Schematic ............................................................................................................................... 5
3.3
Evaluation Board Picture ........................................................................................................ 6
3.4
Board Component Placement ................................................................................................. 6
3.5
Board PCB Layout .................................................................................................................. 7
3.6
Bill of Materials ....................................................................................................................... 8
4
EVALUATION BOARD OPERATING PROCEDURE ................................................................. 9
4.1
Load Connection..................................................................................................................... 9
4.2
AC/DC Input ......................................................................................................................... 10
4.3
IRS27951 DC Supply Voltage .............................................................................................. 10
4.4
Power-up Sequence ............................................................................................................. 10
5
SYSTEM PERFORMANCE CHARACTERIZATION ................................................................ 11
5.1
Steady-State and Start-up Waveforms ................................................................................. 11
5.2
Short Circuit Protection ......................................................................................................... 12
5.3
Dynamic Load Response & Output Voltage Regulation ....................................................... 13
5.4
User Initiated SLEEP Mode .................................................................................................. 14
5.5
Efficiency Chart..................................................................................................................... 14
5.6
Thermal Data ........................................................................................................................ 15
6
Transformer Spec..................................................................................................................... 15
6.1
Electrical Diagram ................................................................................................................. 16
6.2
Resonant Transformer Winding Position on Coil former ....................................................... 16
6.3
Resonant Transformer Winding Characteristics ................................................................... 16