EPR-00011 - 70 W Adapter 22-Jan-01
Page 2 of 46
Power Integrations Inc
Tel: +1 408 414 9200 Fax: +1 408 414 9201
ww: http://www.powerint.com
Table of Contents
1 Introduction..................................................................................................................4
2 Power Supply Specification.........................................................................................6
3 Schematic....................................................................................................................7
3.1 Description...............................................................................................................7
4PCBLayout................................................................................................................10
5 Bill of Materials..........................................................................................................11
6 Transformer Documentation......................................................................................12
6.1 Transformer Sources .............................................................................................14
7 Transformer Spreadsheet..........................................................................................15
8 Performance Data......................................................................................................17
8.1 Efficiency................................................................................................................17
8.2 No-load input power...............................................................................................18
8.3 Regulation / Power Limiting ...................................................................................18
9 Thermal Performance................................................................................................20
10 Waveform Scope Plots..............................................................................................24
10.1 Drain Voltage and Current During Normal Operation.........................................24
10.2 Output Voltage During Power-up........................................................................25
10.3 Output Voltage During Power-down...................................................................26
10.4 Drain Voltage and Current during Power-Up (265 V
AC
)......................................26
10.5 DRAIN Current During Power-Up and Power-Down...........................................27
10.6 Load Transient response (15 to 100% load change) .........................................28
10.6.1 15 to 100% load change, 85 V
AC
.....................................................................28
10.7 Load Transient response (0 to 50% load change) .............................................29
10.7.1 0 to 50% load change, 85 V
AC
.........................................................................29
10.7.2 0 to 50% load change, 130 V
AC
.......................................................................29
10.7.3 0 to 50% load change, 130 V
AC
.......................................................................30
10.8 Ripple Measurements.........................................................................................30
10.8.1 DC Ripple Measurement Technique...............................................................30
10.8.2 Ripple Measurement Results..........................................................................31
11 Control Loop Characteristics.....................................................................................32
11.1 Gain Phase Results............................................................................................33
12 Conducted EMI Scans...............................................................................................36
Important Note:
lthough the EP11 is designed to satisfy safety isolation
requirements, the engineering prototype has not been agency
approved. Therefore all testing should be performed using an
isolation transformer to provide the AC input to the prototype
board
