SSC1S311A 查看數據表（PDF） - Sanken Electric co.,ltd.

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SSC1S311A

Quasi-Resonant Off-Line Switching Control ICs

Sanken Electric co.,ltd. 

SSC1S311A

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 Applications -------------------------------------------------------------------------------------- 7

6. Physical Dimensions -------------------------------------------------------------------------------------- 8

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

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

8.1. Startup Operation----------------------------------------------------------------------------------- 9

8.1.1. Startup Period --------------------------------------------------------------------------------- 9

8.1.2. Undervoltage Lockout (UVLO) Circuit--------------------------------------------------- 9

8.1.3. Bias Assist Function--------------------------------------------------------------------------- 9

8.1.4. Auxiliary Winding -------------------------------------------------------------------------- 10

8.1.5. Soft-Start Function-------------------------------------------------------------------------- 11

8.1.6. Operational Mode at Startup ------------------------------------------------------------- 11

8.2. Constant Voltage Control Operation ---------------------------------------------------------- 12

8.3. Quasi-Resonant Operation and Bottom-On Timing --------------------------------------- 13

8.3.1. Quasi-Resonant Operation ---------------------------------------------------------------- 13

8.3.2. Bottom-On Timing -------------------------------------------------------------------------- 13

8.3.3. BD Pin Blanking Time --------------------------------------------------------------------- 15

8.3.4. Bottom Skip Quasi-Resonant Operation ----------------------------------------------- 16

8.4. Auto Standby Function--------------------------------------------------------------------------- 17

8.5. Overvoltage Protection (OVP) ------------------------------------------------------------------ 18

8.6. Overload Protection (OLP)---------------------------------------------------------------------- 18

8.7. Thermal Shutdown (TSD) ----------------------------------------------------------------------- 19

8.8. Overcurrent Protection (OCP) ----------------------------------------------------------------- 19

8.8.1. Overcurrent Input Compensation Function ------------------------------------------- 19

8.8.2. Reference BD Pin Peripheral Components Setting ----------------------------------- 21

8.8.3. Reference Example of No Overcurrent Input Compensation Required---------- 22

8.9. Maximum On-Time Limitation Function ---------------------------------------------------- 22

8.10. DRV Pin Peripheral Components-------------------------------------------------------------- 22

9. Design Notes ---------------------------------------------------------------------------------------------- 23

9.1. Peripheral Components -------------------------------------------------------------------------- 23

9.2. Transformer Design ------------------------------------------------------------------------------ 23

9.3. Protection against Negative Input Voltage at Start-up Pin ------------------------------- 25

9.4. Phase Compensation------------------------------------------------------------------------------ 25

9.5. PCB trace layout and Component placement ----------------------------------------------- 26

Important Notes---------------------------------------------------------------------------------------------- 28

SSC1S311A-DSE Rev.1.3

SANKEN ELECTRIC CO., LTD.

2

Dec. 22, 2017

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

© SANKEN ELECTRIC CO., LTD. 2012

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