LD7591 Datasheet | Leadtrend Technology Corporation

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 ponents counts and is available in a SOP-8 or DIP-8 package. Those make it an ideal design for low cost applications. It provides functions of low startup current, over voltage protection, open feedback protection, disable function, over current protection, under voltage lockout and integrated LEB of the current sensing. Also, the LD7591 features without mains voltage sensing pared with traditional current mode PFC for power saving. The LD7591 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65μA . Features z z z z z z z z z z z 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/-1200m A Driving Capability Internal OTP function Applications z z z z Output above 65W adaptor. Open Frame Switching Power Supply LCD TV Power Supply LED Power Supply Patent Pending http://../ Typical Application for Boost PFC AC Inpu t EMI Filter 4 5 1 3 6 Leadtrend Technology Corporation LD7591-DS-P03 Apr. 2009 Typical Application for LED (Flyback PFC) AC Input EMI Filter 4 5 2 1 3 6 http://../ Leadtrend Technology Corporation LD7591-DS-P03 Apr. 2009 Pin Configuration (Top view) GND RAMP VCC OUT ZCD CS Ordering Information Part number LD7591 GS LD7591 GN Package SOP-8 Green package DIP-8 Green package Top Mark LD7591GS LD7591GN Shipping 3600/ Tube/ Carton 3000/ Tube/ Carton Pin Descriptions NAME INV P RAMP CS ZCD GND OUT VCC Pin (SOP-8/DIP-8) 1 2 3 4 5 6 7 8 http://../ FUNCTION Output voltage feed back control Output of the error amplifier for voltage...