Features

 PRC〔Pulse Ratio Control〕: (8µs fixed off-time, variable on-time)

The switching frequency varies within an optimum range of 63kHz to 120kHz, according to load 

variations, to create a quasi-jittering, low-EMI noise operation.

 Auto burst standby: (No Load Consumption <100 mW at AC264V)

Enables very low power consumption at no load. 

Typical results of a 5W universal input power supply are 35mW at AC110V and 43mW at AC220V.

 Auto bias function

This function stabilizes operation during Auto Burst Standby mode, by preventing a Hiccup mode. 

The Auto Bias function forces the IC to turn on before the VCC voltage reaches VCC (OFF), thereby 

stabilizing the entire power supply operation.

 Integrated startup circuit

600V BCD process allows direct connection of the STARTUP pin to the rectified high voltage 

rail. This reduces component count and improves overall efficiency.

 Current mode control

 Leading edge blanking

Not required the external Low-pass filter circuit which prevent the malfunction due to the leading 

edge spike current.

 Avalanche energy guaranteed MOSFET with high VDSS

The built-in power MOSFET simplifies the surge absorption circuit since the MOSFET guarantees 

the avalanche energy.

No VDSS de-rating is required.

 Various protecting functions

 Over current protection ------------ pulse by pulse

 Over voltage protection ------------ with latch

 Overload protection ---------------- Auto restart

 Thermal shutdown ------------------ with latch

 

 

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