Datasheet
UG-320 Evaluation Board User Guide
Rev. A | Page 2 of 48
TABLE OF CONTENTS
Features .............................................................................................. 1
Reference Design Contents ............................................................. 1
Caution ............................................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Demo Board Specifications ............................................................. 3
Topology and Circuit Description.................................................. 4
Advantages of interleaving .............................................................. 5
Connectors ........................................................................................ 7
Settings Files and EEPROM ............................................................ 8
Evaluation Board .............................................................................. 9
Equipment ..................................................................................... 9
Setup ............................................................................................... 9
Board Settings ............................................................................. 11
Theory of Operation ...................................................................... 13
During Startup ............................................................................ 13
During Steady State .................................................................... 13
Configuring Flag Settings .............................................................. 14
PWM Settings ................................................................................. 15
Fan Control ................................................................................. 16
Dynamic Phase Shedding and Standby Power ....................... 16
Board Evaluation and Test Data ................................................... 17
Startup .......................................................................................... 17
Transformer Primary Waveform .............................................. 19
Primary Current ......................................................................... 19
Drain Voltage and Current ........................................................ 20
CS1 Pin Voltage and Current Balancing of Phases ................ 20
Synchronous Rectifier Peak Inverse Voltage (PIV) ............... 21
Output Ripple ............................................................................. 21
Transient Voltage ........................................................................ 22
Phase Shedding Turn-On/Off Time ........................................ 25
Primary Current During Load Transient ................................ 26
Output Overcurrent Protection................................................ 27
Digital Current Sharing ............................................................. 27
Closed-Loop Frequency Response ........................................... 28
Efficiency ..................................................................................... 28
CS1 Linearity............................................................................... 28
ACSNS Linearity ........................................................................ 29
CS2 Linearity............................................................................... 29
No Load Power ........................................................................... 29
Thermal Performance ................................................................ 30
Evaluation Board Schematics and Artwork ................................ 31
Main Board Schematic .............................................................. 31
Interfaces Schematic .................................................................. 32
Daughter Card Schematic ......................................................... 33
Main Board Layout .................................................................... 34
Daughter Card Layout ............................................................... 37
Bill of Materials ............................................................................... 39
Appendix I—Transformer Specifications .................................... 42
Appendix II—Output Inductor Specifications ........................... 43
Appendix III—Register File (ADP1046_I2SF_032011.46r) ..... 44
Appendix IV—Board File (ADP1046_I2SF_032011.46b) ........ 47
Related Links ................................................................................... 48
REVISION HISTORY
8/12—Rev. 0 to Rev. A
Added Figure 74; Renumbered Sequentially .............................. 30
Change to Table 6 ........................................................................... 40
4/12—Revision 0: Initial Version