Transition-Mode PFC Controller with Fault Condition Protection
The LD7591 is a voltage mode PFC controller operating on transition mode, with several integrated functions, such as OVP, OCP, and brown-in protection.
It reduces the components counts and is an ideal solution for cost effective applications.
The IC provides functions of low start up current, over voltage protection, open feedback protection, disable funtion, over current protection,
under voltage lockout and integrated LEB of current sensing.
Unlike the traditional current mode PFC controller, LD7591 is free from extra rectified AC line voltage information to minimize power loss.
The LD7591 will be disabled if INV pin voltage falls below 0.45V and the operating current rises over 65µA.
The IC is available in SMD or THT. LD7591 GS in SOP-8 and LD7591 GN in DIP-8 package.
FEATURES
▲ Transistion mode of PFC pre-regulator
▲ Voltage mode control
▲ Programmable max. on-time
▲ Low startup current (< 30mA)
▲ UVLO (Under Voltage Lockout)
▲ LEB (Leading-Edge Blanking) on CS pin
▲ Open-Feedback protection and disable function
▲ OVP (Over Voltage Protection)
▲ OCP (Cycle by cycle current limiting)
▲ 800/-1200mA driving capability
▲ Internal OTP (Over Temperature Protection)
APPLICATIONS
▲ 65W adaptor
▲ Open frame switching power supply
▲ LCD TV power supply
▲ LED power supply
Datasheet 
