ld7575ps.pdf

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LD 6/5/2007 1 Leadtrend Technology Corporation LD7575-DS-04a June 2007 Gree n-Mode PWM Controller with High-Voltage Start-Up Circuit REV: 04a General Description The LD7575 is a current-mode PWM controller with excellent power-saving operation. It features a high- voltage current source to directly supply the startup current from bulk capacitor and further to provide a lossless startup circuit. The in tegrated functions such as the le ading-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 LD7575 is offered in both SOP-8 a nd DIP-8 package. Features High-Voltage (500V) Startup Circuit Current Mode Control Non-Audible-Noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin Programmable Switching Frequency Internal Slope Compensation OVP (Over Voltage Protection) on Vcc OLP (Over Load Protection) 500mA Driving Capability Applications Switching AC/DC Adapter and Battery Charger Open Frame Switching Power Supply LCD Monitor/TV Power Typical Application

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