SSC3S921
SSC3S921 is LLC Current-Resonant Off-Line Switching Controller manufactured by Sanken.
LLC Current-Resonant Off-Line Switching Controller
Data Sheet
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 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-performance power supply systems with few external ponents.
- SMZ: Soft-switched Multi-resonant Zero Current switch, achieved soft switching operation during all switching periods.
Features
- Standby Mode Change Function ▫ Output Power at Light Load: PO = 125 m W (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
- PFC IC ON/OFF Function: In standby operation, the IC turns off PFC IC.
- Soft-start Function
- Capacitive Mode Detection Function
- Reset Detection Function
- Automatic Dead Time Adjustment Function
- Input Electrolytic Capacitor Discharge Function
- Protections
▫ Brown-In and Brown-Out Function: ▫ High-side Driver UVLO: Auto-restart: 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): Latched shutdown ▫ Thermal Shutdown (TSD): Auto-restart
Typical Application
PFC OUT GND
PFC IC (SSC2016S)
VSEN 1 VCC 2 FB 3 ADJ 4 CSS 5 CL 6 RC 7 PL 8 SB 9
U1 18 ST
17 16 VGH 15 VS 14 VB
13 12 REG 11 VGL 10 GND
Package
SOP18
Not to scale
Applications
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...
