SSC2016S

SSC2016S - DSJ Rev.1.3

SANKEN ELECTRIC CO.,LTD.

2

Jul. 22, 2016

http://www.sanken-ele.co.jp/en/

© SANKEN ELECTRIC CO.,LTD. 2015

CONTENTS

Description ------------------------------------------------------------------------------------------------------ 1

CONTENTS ---------------------------------------------------------------------------------------------------- 2

1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3

2. Electrical Characteristics -------------------------------------------------------------------------------- 4

3. Block Diagram --------------------------------------------------------------------------------------------- 6

4. Pin Configuration Definitions--------------------------------------------------------------------------- 6

5. Typical Application --------------------------------------------------------------------------------------- 7

6. External Dimensions-------------------------------------------------------------------------------------- 8

7. Marking Diagram ----------------------------------------------------------------------------------------- 8

8. Operational Description --------------------------------------------------------------------------------- 9

8.1

Critical Conduction Mode: CRM ---------------------------------------------------------------- 9

8.2

Startup Operation--------------------------------------------------------------------------------- 10

8.2.1

To Use an External Power Supply ------------------------------------------------------- 10

8.2.2

To Use an Auxiliary Winding ------------------------------------------------------------- 10

8.3

Restart Circuit ------------------------------------------------------------------------------------- 11

8.4

Maximum On-time Setting ---------------------------------------------------------------------- 11

8.5

Zero Current Detection and Bottom-on Timing Setting----------------------------------- 11

8.6

Maximum Switching Frequency Limitation Function ------------------------------------- 12

8.7

Overcurrent Protection (OCP) ----------------------------------------------------------------- 12

8.8

Overvoltage Protection (OVP)------------------------------------------------------------------ 13

8.9

FB Pin Under Voltage Protection (FB_UVP) ------------------------------------------------ 13

8.10 Thermal Shutdown (TSD) ----------------------------------------------------------------------- 13

9. Design Notes ---------------------------------------------------------------------------------------------- 13

9.1

Inductor Design------------------------------------------------------------------------------------ 13

9.1.1

Boost winding, P ----------------------------------------------------------------------------- 13

9.1.2

Auxiliary Winding, D ----------------------------------------------------------------------- 14

9.2

External Components ---------------------------------------------------------------------------- 15

9.2.1

FB Pin Peripheral Circuit (Output VoltageDetection)------------------------------- 15

9.2.2

COMP Pin Peripheral Circuit, RS, CS and CP ----------------------------------------- 15

9.2.3

CT Pin Peripheral Circuit, C4 ------------------------------------------------------------ 15

9.2.4

CS Pin Peripheral Circuit, RCS, R5 and C5 -------------------------------------------- 15

9.2.5

ZCD Pin Peripheral Circuit, R1 and C6 ------------------------------------------------ 16

9.2.6

OUT Pin Peripheral Circuit (Gate Drive Circuit) ------------------------------------ 16

9.2.7

VCC Pin Peripheral Circuit--------------------------------------------------------------- 17

9.2.8

Power MOSFET, Q1------------------------------------------------------------------------ 17

9.2.9

Boost Diode, DFW ---------------------------------------------------------------------------- 18

9.2.10

Bypass Diode, DBYP-------------------------------------------------------------------------- 18

9.2.11

Output Capacitor, C2 ---------------------------------------------------------------------- 18

9.3

PCB Trace Layout and Component Placement --------------------------------------------- 18

10. Reference Design of Power Supply ------------------------------------------------------------------ 20

Important Notes---------------------------------------------------------------------------------------------- 22