SSC9522S Built In Floating Drive Circuit For High Side Power MOSFET

1.General Descriptions

The SSC9522S is a controller IC (SMZ method) for half-bridge resonant type power supply, incorporating a floating drive circuit for High-side MOSFET drive. ※SMZ = Soft-switched Multi-resonant Zero Current switch
All switching periods work with soft switching operation. The IC is in SOP18 package, and suitable for high performance power supply system with small size, high efficiency and low noise, because for various power supply specifications, more effective and easier design works are achievable with effective functions as the Automatic Dead Time Adjustment, the Uncontrollable Operation Detection and so on.
※Uncontrollable Operation Detection = there are two areas in resonant circuit impedance; capacitance area and inductance area. The Uncontrollable Operation occurs in capacitance area (the frequency is lower than the resonant frequency, fO), the output voltage can not be controlled and the switching operation becomes hard switching.

2.Features and benefits include the followings

OP18 package
•Built-in floating drive circuit for High-side MOSFET
•Soft Start Function, reducing of power MOSFET stress and preventing Uncontrollable Operation, at startup
•Uncontrollable Operation Detection Function on pulse-by-pulse basis, improving the ability of transformer output wattage because the frequency range is available up to the resonant frequency, fO, and reducing power MOSFET stress
•Automatic Dead Time Adjustment Function, not being necessary to make the dead time adjustment for eachpower supply specification
•Protection Functions -Line Undervoltage Protection Function ------------------- Prevention of excessive input current and overheat (Brown-In／Brown-Out Function) at low input voltage
-External Latch Function-------------------------------------- Latch shutdown by external signal input
-Overcurrent Protection Function (OCP) ------------------ Three steps protection corresponding to overcurrent levels
-Overvoltage Protection Function (OVP)------------------ Latch shutdown -Overload Protection Function (OLP) ---------------------- Latch shutdown -Thermal Shutdown Functions (TSD) ---------------------- Latch shutdown

3.Functional Block Diagram

4.The device is encapsulated in a standard 18 pin SOP package

5.Typical Application Circuit

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