Shenzhen Hongxinwei Technology Co., Ltd |
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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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