Samsung S3F84A5 - Manual (Page 4)

Table of Contents
1 Overview of HPLED Lighting Control System ............................................7
1.1 Pin Assignment in S3F84P4 ........................................................................................................................7
1.2 Key Features of S3F84P4............................................................................................................................8
1.3 System Principle ..........................................................................................................................................8
1.3.1 Buck Circuit...........................................................................................................................................9
1.3.2 Summary ..............................................................................................................................................9
1.3.3 Constant Current Control....................................................................................................................10
2 Hardware Implementation ..........................................................................11
2.1 System Diagram and Circuit ......................................................................................................................11
2.2 Components Selection...............................................................................................................................12
2.2.1 Select the Inductance (L1) for the Requirement of Current Ripple ....................................................12
2.2.2 Select the Capacitance (C2) for the Requirement of Voltage Ripple .................................................12
3 Software Implementation............................................................................13
4 System Validation .......................................................................................15
5 Appendix ......................................................................................................17
5.1 BOM List of Key Circuit..............................................................................................................................17
5.2 Appendix 2: Source Code ..........................................................................................................................17