SSC2005SC
CONTENTS
General Description ------------------------------------------------------------------------ 1
1. Absolute Maximum Ratings--------------------------------------------------------- 3
2. Electrical Characteristics ------------------------------------------------------------ 3
3. Functional Block Diagram----------------------------------------------------------- 5
4. Pin Configuration Definitions------------------------------------------------------- 5
5. Typical Application Circuit --------------------------------------------------------- 6
6. Package Outline ------------------------------------------------------------------------ 7
7. Marking Diagram --------------------------------------------------------------------- 7
8. Operational Description-------------------------------------------------------------- 8
8.1 Critical Conduction Mode: CRM ----------------------------------------- 8
8.2 Startup Operation ------------------------------------------------------------ 9
8.3 Restart Circuit ---------------------------------------------------------------- 9
8.4 Maximum On-time Setting ------------------------------------------------- 9
8.5 Zero Current Detection
and Bottom-on Timing (Delay Time) Setting ------------------------ 10
8.6 Minimum Off-time Limit Function -------------------------------------- 11
8.7 Overvoltage Protection (OVP) -------------------------------------------- 11
8.8 FB pin Under Voltage Protection (FB_UVP) -------------------------- 11
8.9 Overcurrent Protection (OCP) ------------------------------------------- 12
9. Design Notes --------------------------------------------------------------------------- 12
9.1 Inductor Setup --------------------------------------------------------------- 12
9.2 External Components------------------------------------------------------- 13
9.3 PCB Trace Layout and Component Placement ----------------------- 15
10. Reference Design of Power Supply ----------------------------------------------- 17
OPERATING PRECAUTIONS -------------------------------------------------------- 18
IMPORTANT NOTES ------------------------------------------------------------------- 19
SSC2005SC-DS Rev.1.1
SANKEN ELECTRIC CO.,LTD.
2
Feb. 06, 2015