LLC Current-Resonant Off-Line Switching Controller
SSC3S927
Data Sheet
Description
Package
The SSC3S927 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 IC includes useful functions such
as Standby Function, Automatic Dead Time Adjustment,
and Capacitive Mode Detection. The IC achieves high
efficiency, low noise and high cost-effective power
supply systems with few external components.
SOP18
*SMZ: Soft-switched Multi-resonant Zero Current
switch, achieved soft switching operation during all
switching periods.
Not to scale
Features
● Standby Mode Change Function
▫ Output Power at Light Load:
PO = 150 mW (PIN = 0.27 W)
▫ Burst operation in standby mode
▫ Soft-on/Soft-off function: reduces audible noise
● PFC IC ON/OFF Function: In standby operation, the IC
turns off PFC IC.
Applications
Switching power supplies for electronic devices such as:
● Soft-start Function
● Capacitive Mode Detection Function
● Reset Detection Function
● Digital Appliances: LCD television and so forth
● Office Automation (OA) equipment: server, multi-
function printer, and so forth
● Automatic Dead Time Adjustment Function
● Built-in Startup Circuit
● Industrial Apparatus
● Communication Facilities
● X-capacitor Discharge Function
● Protections
▫ Input Voltage Detection Function
Input Overvoltage Protection (HVP): Auto-restart
Input Undervoltage Protection (UVP): Auto-restart
▫ High-side Driver UVLO: Auto-restart
▫ Overcurrent Protection (OCP): Auto-restart, peak
drain current detection, 2-step detection
▫ Overload Protection (OLP): Auto-restart
▫ Overvoltage Protection (OVP): Auto-restart
▫ REG Overvoltage Protection (REG_OVP):
Auto-restart
▫ Thermal Shutdown (TSD): Auto-restart
Typical Application
X-Cap
VOUT1(+)
PFC OUT
U1
VSEN
VCC
FB
ST
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
GND
VGH
VS
ADJ
CSS
CL
VOUT(-)
VB
RC
REG
VGL
GND
VOUT2(+)
CD
SB
PFC IC
(SSC2016S)
VCC
Standby
SSC3S927-DSE Rev.1.9
Nov. 29, 2023
SANKEN ELECTRIC CO., LTD.
https://www.sanken-ele.co.jp/en
1
© SANKEN ELECTRIC CO., LTD. 2016