SSC3S921 |Sanken Electric

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SSC3S921

Data sheetdownload (PDF:1087.11KB)
Application Note

Description

The SSC3S921 is a controller with SMZ method for LLC current resonant switching power supplies, incorporating a floating drive circuit for a high-side power MOSFET.
The product includes useful functions such as Standby Function, Automatic Dead Time Adjustment, and Capacitive Mode Detection.
The product achieves high efficiency, low noise and high cost-performance power supply systems with few external components.

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Application

Switching power supplies for electronic devices such as:
Digital appliances
Office automation (OA) equipment
Industrial apparatus
Communication facilities

Features

Standby Mode Change Function
 -Output Power at Light Load 125 mW (Pin = 0.27 W)
 -Burst mode in standby operation
 -Reduces audible noise by Soft-On/Soft-Off function
PFC IC ON/OFF Function: In standby operation, the IC
   turns off PFC IC.
Floating Drive Circuit
Soft-Start function
Capacitive Mode Detection Function
Reset Detection Function
Automatic Dead Time Adjustment Function
Brown-In and Brown-Out Function
Built-in Startup Circuit
Input Capacitor Discharge Function
・Protection Functions
 - High-side Driver UVLO
 - Overcurrent Protection (OCP): 2-step detection
 - Overload Protection (OLP)
 - Overvoltage Protection (OVP)
 - Thermal Shutdown (TSD)

Remarks

LLC IC

TypePart NumberFeature
xternal power supply type SSC9522SSuitable for low standby power applications.
Built-in standby function type
(Reducible in power supply size)
SSC3S901
SSC3S902
External-signal-controlled standby mode
2 types of protection mode: Auto-restart for 901, Latch for 902.
SSC3S910
SSC3S921
SSC3S927
Built-in Auto Standby Function
(PFC ON/OFF Function for 921, PFC ON/OFF Function and X-capacitor Discharge Function for 927.)

Package

Package Name:SOP18

Package Diagram

Specifications

Control MethodCurrent Resonant
SeriesSSC3S921
ST Terminal Breakdown Voltage600V
VCC Breakdown Voltage35V
Oscillating Frequency31.5k to 300kHz

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Representative Circuit

Internal Block Diagram

Pin-out Diagrams

Data sheetdownload (PDF:1087.11KB)
Application Note
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