LD7575B

LD7575B 5/26/2008 Green-Mode PWM Controller with High-Voltage Rev. 00 Start-Up Circuit General Description The LD7575B is a current-mode PWM controller with excellent power-saving operation. It features a highvoltage current source to directly supply the startup current from bulk capacitor and further to provide a lossless startup circuit. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation, and the small package provide the users a high efficiency, minimum external component counts, and low cost solution for AC/DC power applications. Furthermore, the embedded over voltage protection, over load protection and the special green-mode control provide the solution for users to design a high performance power circuit easily. The LD7575B is offered in both SOP-8 and DIP-8 package. Features z High-Voltage (500V) Startup Circuit z Current Mode Control z Non-Audible-Noise Green Mode Control z UVLO (Under Voltage Lockout) z LEB (Leading-Edge Blanking) on CS Pin z Programmable Switching Frequency z Internal Slope Compensation z OVP (Over Voltage Protection) on Vcc z OLP (Over Load Protection) z 500mA Driving Capability Applications z Switching AC/DC Adapter and Battery Charger z Open Frame Switching Power Supply z LCD Monitor/TV Power Typical Application Leadtrend Technology Corporation LD7575B-DS-00 May 2008 1 Pin Configuration LD7575B SOP-8 & DIP-8 (TOP VIEW) HV NC VCC OUT 8 765 TOP MARK YYWWPP 1 234 YY: WW: PP: ...