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SSC1S310A Datasheet Preview

SSC1S310A Datasheet

Quasi-Resonant Off-Line Switching Controller

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Quasi-Resonant Off-Line Switching Control ICs
SSC1S310A Series
Data Sheet
Description
SSC1S310A series is the controller ICs of a quasi-
resonant mode for a switching power supplies. The IC
incorporates a startup circuit and a standby function to
reduce a power consumption and standby power. In
normal operation, the quasi-resonant mode operation
achieves high efficiency and low noise. In addition, in
medium to low load conditions, the operation mode is
automatically changes the quasi-resonant mode to the
bottom-skip mode to improve efficiency. The IC is
provided in the SOIC8 package. The power supply that
is a low component counts and a high performance-to-
cost can be achieved by the rich set of protection
features.
Features
Multi-Mode Control
(High efficiency operation in all range of loads)
Automatic Standby Function
(Standby power is inproved by burst oscillation mode)
Input Power at No Load:
<30mW at 100 VAC
<50mW at 230 VAC
Bottom-Skip Function
(Switching loss in medium to low loads is reduced)
Step-on Burst Oscillation Function
(Transformer audible noises are reduced)
Bias Assist Function
Soft-Start Function
Adjustable Startup Voltage
Maximum On-time Limitation Function
VCC Operational Range Expanded
Leading Edge Blanking (LEB) Function
(External Filter Components are reduced)
Protection Functions
Overcurrent Protection (OCP): Pulse-by-pulse
Overvoltage Protection (OVP)
Overload Protection (OLP)
Thermal Shutdown (TSD)
Typical Application
D1
VAC
C1
CV
Q1
D3 R5
R4
R3
R12
C9
87
6
5
GND VCC OCP DRV
U1
SSC1S310A
ROCP
FB/OLP BD
ST
1
2
4
R1
C3 PC1
C4
C5
T1
D4
P
RST
D2
C2
R2
D
DZBD
RBD1
C6
S
CBD
RBD2
L1
R9
PC1 R6
R10
R7
C7 R8
U2
R11
VOUT
C8
GND
Packages
SOIC8
Not to scale
Specifications
VCC Maximum rating: 35 V
Operation Start Voltage,VCC(ON): 15.1 V (typ.)
PWM Operation Frequency, fOSC: 21.0 kHz (typ.)
Maximum On-time, tON(MAX): 40.0 µs (typ.)
Selection Guide
Part Number
SSC1S311A
SSC1S312A
Protection Operation
(OVP, OLP, TSD)
Auto-restart
Latched Shutdown
Applications
Digital Appliance
Office Automation (OA) Equipment
White Goods
Industrial Apparatus
Communication Facilities
SSC1S310A-DSE Rev.2.1
SANKEN ELECTRIC CO., LTD.
1
Mar. 15, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2012




Sanken

SSC1S310A Datasheet Preview

SSC1S310A Datasheet

Quasi-Resonant Off-Line Switching Controller

No Preview Available !

SSC1S310A Series
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Electrical Characteristics -------------------------------------------------------------------------------- 3
3. Block Diagram --------------------------------------------------------------------------------------------- 5
4. Pin Configuration Definitions--------------------------------------------------------------------------- 5
5. Typical Applications -------------------------------------------------------------------------------------- 6
6. Physical Dimensions -------------------------------------------------------------------------------------- 7
7. Marking Diagram ----------------------------------------------------------------------------------------- 7
8. Operational Description --------------------------------------------------------------------------------- 8
8.1. Startup Operation----------------------------------------------------------------------------------- 8
8.1.1. Startup Period --------------------------------------------------------------------------------- 8
8.1.2. Undervoltage Lockout (UVLO) Circuit--------------------------------------------------- 8
8.1.3. Bias Assist Function--------------------------------------------------------------------------- 8
8.1.4. Auxiliary Winding ---------------------------------------------------------------------------- 9
8.1.5. Soft-Start Function-------------------------------------------------------------------------- 10
8.1.6. Operational Mode at Startup ------------------------------------------------------------- 10
8.2. Constant Voltage Control Operation ---------------------------------------------------------- 11
8.3. Quasi-Resonant Operation and Bottom-On Timing --------------------------------------- 12
8.3.1. Quasi-Resonant Operation ---------------------------------------------------------------- 12
8.3.2. Bottom-On Timing -------------------------------------------------------------------------- 12
8.3.3. BD Pin Blanking Time --------------------------------------------------------------------- 14
8.3.4. Bottom Skip Quasi-Resonant Operation ----------------------------------------------- 15
8.4. Auto Standby Function--------------------------------------------------------------------------- 16
8.5. Overvoltage Protection (OVP) ------------------------------------------------------------------ 17
8.6. Overload Protection (OLP)---------------------------------------------------------------------- 17
8.7. Thermal Shutdown (TSD) ----------------------------------------------------------------------- 18
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---------- 21
8.9. Maximum On-Time Limitation Function ---------------------------------------------------- 21
8.10. DRV Pin Peripheral Components-------------------------------------------------------------- 22
9. Design Notes ---------------------------------------------------------------------------------------------- 22
9.1. Peripheral Components -------------------------------------------------------------------------- 22
9.2. Transformer Design ------------------------------------------------------------------------------ 22
9.3. Protection against Negative Input Voltage at Start-up Pin ------------------------------- 24
9.4. Phase Compensation------------------------------------------------------------------------------ 24
9.5. PCB trace layout and Component placement ----------------------------------------------- 24
Important Notes---------------------------------------------------------------------------------------------- 26
SSC1S310A-DSE Rev.2.1
SANKEN ELECTRIC CO., LTD.
2
Mar. 15, 2019
https://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2012


Part Number SSC1S310A
Description Quasi-Resonant Off-Line Switching Controller
Maker Sanken
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