High Efficiency, Low noise, Automatic Dead Time Adjustment
Control IC for Half-Bridge LLC Off-line Switching Regulators
General Description
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 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.
Features and Benefits
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 each
power supply specification
Line Undervoltage Protection Function
(Brown-In／Brown-Out Function)
Prevention of excessive input current and overheat at low
input voltage
Protection Functions
External Latch Function ------------ Latch shutdown by
external signal input
Overcurrent Protection (OCP) ----- Pulse-by-pulse
Overvoltage Protection (OVP) ---- Latch shutdown
Overload Protection (OLP) -------- Latch shutdown
Thermal Shutdown (TSD) ---------- Latch shutdown
Electrical Characteristics
Maximum rating of VCC： 35V(MAX)
Minimum frequency, F(MIN)： 28.3kHz(TYP)
Maximum frequency, F(MAX)： 300kHz(TYP)
Maximum dead - time, td(MAX)： 2.45μs(TYP)
Minimum dead - time , td(MIN)： 0.50μs(TYP)
Applications
Switching power supplies for electronic devices such as:
LCD and PDP TV
Sarver
Multi Function Printer
Industrial Equipment
Communications Equipment
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