SSC2005SC

SSC2005SC-DS Rev.1.1

SANKEN ELECTRIC CO.,LTD.

2

Feb. 06, 2015

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