LLC Current-Resonant Off-Line Switching Controller
SSC3S900 Series
Data Sheet
Description
Package
The SSC3S900 series is a controller with SMZ*
method for LLC current resonant switching power
supplies, incorporating a floating drive circuit for a
high-side power MOSFET.
SOP18
The product includes useful functions such as Standby
mode change, Overload Protection with input voltage
compensation, Automatic Dead Time Adjustment, and
Capacitive Mode Detection. The product realizes high
performance-to-cost power supply system, downsized by
high efficiency and low noise.
*SMZ: Soft-switched Multi-resonant Zero Current
switch, achieved soft switching operation during all
switching periods
Not to scale
Lineup
Features
Protection Operation
Product
● Standby Mode Change Function
▫ Output Power at Light Load: PO = 100 mW
(PIN = 0.27 W, as a reference with discharge resistor
of 1MΩ for across the line capacitor)
▫ Burst operation in standby mode
▫ Soft-on/Soft-off function: reduces audible noise
● Realizing power supply with universal mains input
voltage
UVLO / OCP
Auto Restart
Auto Restart
OLP / OVP / TSD
Auto Restart
SSC3S901
SSC3S902
Latch Shutdown
Application
● Floating Drive Circuit: drives a high-side power
MOSFET directly
● Soft-start Function
Switching power supplies for electronic devices such as:
● Digital appliances: LCD television and so forth
● Office automation (OA) equipment: server, multi-
function printer, and so forth
● Industrial apparatus
● Communication facilities
● Capacitive Mode Detection Function
● Reset Detection Function
● Automatic Dead Time Adjustment Function
● Brown-In and Brown-Out Function
● Built-in Startup Circuit
● Input Electrolytic Capacitor Discharge Function
● Protections
▫ High-side Driver UVLO
▫ Overcurrent Protection (OCP): Peak drain current
detection, 2-step detection
▫ Overload Protection (OLP) with Input Voltage
Compensation
▫ Overvoltage Protection (OVP)
▫ Thermal Shutdown (TSD)
Typical Application
VAC
T1
VOUT1
VSEN
ST
PC1
1
18
17
16
15
14
13
12
11
10
VCC
FB
NC
2
3
4
5
6
7
8
9
VGH
VS
VSPL
CSS
CL
GND
VB
NC
VOUT2
RC
REG
VGL
GND
PL
PC2
SB
Standby
PC1
PC2
SSC3S900 - DSJ Rev.2.4
Apr. 01, 2016
SANKEN ELECTRIC CO.,LTD.
http://www.sanken-ele.co.jp
1
© SANKEN ELECTRIC CO.,LTD. 2013