General Description
The LD7591 is a voltage mode PFC controller operating on transition mode, integrated several functions of protection, such as OVP, OCP, and Brown-in protection. It minimizes the component counts and is available in a SOP-8 or DIP-8 package, making an ideal design for low cost applications.
With functions of low startup current, over voltage protection, open feedback protection, disable function, over current protection, under voltage lockout and integrated LEB for current sensing, the LD7591 features no main-voltage sensing in comparison with conventional current mode PFC controllers. The LD7591 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65μA.
Features
• Transition mode of PFC pre-regulator
• Voltage mode control
• Programmable Max. on-time
• Low Startup Current (<30μA)
• 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 function
Applications
• Adaptor with output power above 65W.
• Open Frame Switching Power Supply
• LCD TV Power Supply
• LED Power Supply
Typical Application
 click to view large size
|
