SSC3S910

SSC3S910 - DSJ Rev.1.5

SANKEN ELECTRIC CO., LTD.

2

Jan. 17, 2018

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

© SANKEN ELECTRIC CO., LTD. 2014

Contents

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

Contents --------------------------------------------------------------------------------------------------------- 2

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

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

3. Block Diagram --------------------------------------------------------------------------------------------- 7

4. Pin Configuration Definitions--------------------------------------------------------------------------- 7

5. Typical Application --------------------------------------------------------------------------------------- 8

6. Physical Dimensions -------------------------------------------------------------------------------------- 9

7. Marking Diagram ----------------------------------------------------------------------------------------- 9

8. Operational Description ------------------------------------------------------------------------------- 10

8.1

Resonant Circuit Operation --------------------------------------------------------------------- 10

8.2

Startup Operation--------------------------------------------------------------------------------- 13

8.3

Undervoltage Lockout (UVLO) ---------------------------------------------------------------- 13

8.4

Bias Assist Function------------------------------------------------------------------------------- 13

8.5

Soft Start Function -------------------------------------------------------------------------------- 14

8.6

Minimum and Maximum Switching Frequency Setting ----------------------------------- 14

8.7

High-side Driver ----------------------------------------------------------------------------------- 14

8.8

Constant Voltage Control Operation ---------------------------------------------------------- 15

8.9

Standby Function---------------------------------------------------------------------------------- 15

8.9.1

Standby Mode Changed by External Signal ------------------------------------------- 16

8.9.2

Burst Oscillation Operation --------------------------------------------------------------- 16

8.10 Automatic Dead Time Adjustment Function ------------------------------------------------ 17

8.11 Brown-In and Brown-Out Function ----------------------------------------------------------- 17

8.12 Capacitive Mode Detection Function ---------------------------------------------------------- 18

8.13 Input Electrolytic Capacitor Discharge Function------------------------------------------- 19

8.14 Reset Detection Function ------------------------------------------------------------------------ 19

8.15 Overvoltage Protection (OVP) ------------------------------------------------------------------ 21

8.16 Overcurrent Protection (OCP) ----------------------------------------------------------------- 21

8.17 Overload Protection (OLP) with Input Voltage Compensation -------------------------- 22

8.17.1

Overload Protection (OLP)---------------------------------------------------------------- 22

8.17.2

OLP Input Voltage Compensation Function------------------------------------------- 23

8.18 Thermal Shutdown (TSD) ----------------------------------------------------------------------- 24

9. Design Notes ---------------------------------------------------------------------------------------------- 25

9.1

External Components ---------------------------------------------------------------------------- 25

9.1.1

Input and Output Electrolytic Capacitors---------------------------------------------- 25

9.1.2

Resonant Transformer --------------------------------------------------------------------- 25

9.1.3

Current Detection Resistor, ROCP -------------------------------------------------------- 25

9.1.4

Current Resonant Capacitor, Ci --------------------------------------------------------- 25

9.1.5

Gate Pin Peripheral Circuit --------------------------------------------------------------- 25

9.2

PCB Trace Layout and Component Placement --------------------------------------------- 25

10. Pattern Layout Example ------------------------------------------------------------------------------- 27

11. Reference Design of Power Supply ------------------------------------------------------------------ 28

Important Notes---------------------------------------------------------------------------------------------- 31