LLC Current-resonant Off-line Switching Controller
SSC3S937
Data Sheet
Description
Package
The SSC3S937 is a controller with SMZ* method for
LLC current resonant switching power supplies,
SOP18
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.
*SMZ: Soft-switched Multi-resonant Zero Current
switch, achieved soft switching operation during all
switching periods.
Not to scale
Features
● Pb-free (RoHS Compliant)
● Standby Mode Change Function by External Signal
▫ 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
● Soft-start Function
Applications
Switching power supplies for electronic devices such as:
● Capacitive Mode Detection Function
● Reset Detection Function
● Automatic Dead Time Adjustment Function
● Built-in Startup Circuit
● X-capacitor Discharge Function (AC Input Mode)
● Input Capacitor Discharge Function (DC Input Mode)
● Protections
● Digital Appliances (e.g., Television)
● Office Automation (OA) Equipment (e.g., Server,
MultiFunction Printer)
● Industrial Apparatus
● Communication Facilities
– Input Voltage Protection
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, Two Types Protection
– Overload Protection (OLP): Auto-restart
– VCC Pin Overvoltage Protection (VCC_OVP):
Auto-restart
– REG Pin Overvoltage Protection (REG_OVP):
Auto-restart
– Thermal Shutdown (TSD): Auto-restart
Typical Application
X-Cap
VOUT1(+)
PFC OUT
SSC3S937
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
SB
VOUT(-)
CSS
CL
VB
U1
RC
REG
VGL
GND
VOUT2(+)
CD
MODE
Standby
SSC3S937-DSE Rev.1.2
Nov. 29, 2023
SANKEN ELECTRIC CO., LTD.
https://www.sanken-ele.co.jp/en
1
© SANKEN ELECTRIC CO., LTD. 2020