Description
The SSC3S937 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.
*SMZ: Soft-switched Multi-resonant Zero Current
switch, achieved soft switching operation during all
switching periods.

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
● 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
– 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

Applications
Switching power supplies for electronic devices such as:
● Digital Appliances (e.g., Television)
● Office Automation (OA) Equipment (e.g., Server,
MultiFunction Printer)
● Industrial Apparatus
● Communication Facilities