Features 

Multi-Mode Control 

The operation mode switching with three steps according to load conditions achieves the 

optimal high efficiency and low noise power supply systems across the full load range. 

(The confirmation of product number is necessary because some functions are different 

in each product.) 

In Standby (Under Standby Load Conditions): 

－UVLO Intermittent Oscillation by lowering output voltage --- Switched by Standby Signal, or 

－Auto Burst-Oscillation --- Switched Automatically 

Under Low to Middle Load Conditions: Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR) 

Under Middle to Rating (or Heavy) Load Conditions: Quasi-Resonant Operation (QR) 

Current-Mode Control 

Built-in PWM Oscillator 

The PWM operates with the minimum frequency of around 22 kHz, until the quasi-resonant signal becomes 

valid, reduces the stress on components at startup and load-shorted. 

Soft-Start Function 

Step-Drive Function, reducing switching noise 

Built-in Maximum ON Time Limitation Circuit 

The function limits the maximum ON time of power MOSFET, during the transitions at low input voltage, 

power ON/OFF. 

Input Compensation at Overcurrent 

The function reduces the distortion of overcurrent operation point to AC input voltage change by adding three 

components. 

Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET 

Various Protections 

 Overcurrent Protection (OCP) -------------------------------- Pulse-by-Pulse 

 Overload Protection (OLP)-------------------------------------- Latch Shutdown 

 Overvoltage Protection (OVP) -------------------------------- Latch Shutdown

 

 

 

 

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