Dual Output Off-Line Non-isolated Fly-back Power Solution
AP3917B 12V/20mA+3.8V20mA EV3 Board User’s Guide
AP3917B EV3 Page 1 of 17 06-21-2019
Rev 1.0 www.diodes.com
Table of Content
Chapter1 Induction.................................................2
1.1 General Description........................................2
1.2 AP3917B Key Features..................................2
1.3 Applications....................................................2
1.4 Board Picture..................................................2
Chapter2 Power Supply Specification..................3
2.1 system performance.......................................3
2.2 Environment...................................................3
Chapter3 Schematic and bill of material ..............4
3.1 Schematic.......................................................4
3.2 Bill of Material.................................................4
3.3 Transformer Specification ..............................5
3.3.1 Electrical Diagram...................................5
3.3.2 Transformer Instructions.........................5
3.3.3 Electrical Specifications..........................5
Chapter4 Evaluation Board Connections ............5
4.1 PCB Layout ....................................................5
4.2 Circuit Description..........................................6
4.2.1 Input EMI Filtering...................................6
4.2.2 Control IC................................................6
4.2.3 Flyback block..........................................6
4.2.4 Output Rectification ................................6
4.2.5 Output Feedback ....................................6
4.3 Quick Start Guide...........................................6
Chapter5. System test............................................7
5.1 Input & Output Characteristics.......................7
5.1.1 Input Standby Power ..............................7
5.1.2 Efficiency.................................................7
5.1.3 Line Regulation.......................................8
5.1.4 load regulation ........................................9
5.2 Key Performance test.....................................9
5.2.1 Start up performance..............................9
5.2.2 Voltage Stress.......................................10
5.2.3 Output Ripple & Noise ..........................11
5.2.4 Dynamic Response...............................12
5.3 Protection(SCP) test ....................................13
5.4 Thermal Test................................................14
5.5 System EMI Scan.........................................15
5.5.1 Conduction EMI test of 230V@full load15
5.5.2 Conduction EMI test of 110V@full load16
