LD7552D

LD7552D 12/19/2007 Green-Mode PWM Controller with Integrated Protections and Adjustable OLP Delay Time REV: 00 General Description The LD7552D are specifically designed for the low total system cost by integrating many functions, protections, and the EMI-improved solution in a SOP-8 package which usually need a lot of extra components or circuits on the general designs. The implemented functions include low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. And the LD7552D features more protections like OLP (Over Load Protection) and OVP (Over Voltage Protection) to prevent the circuit damage from the abnormal conditions. Features z High-Voltage CMOS Process with Excellent ESD protection z Very Low Startup Current (<20μA) 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 Adjustable OLP Delay Time. z Internal Slope Compensation z OVP (Over Voltage Protection) on Vcc Pin z OLP (Over Load Protection) z 500mA Driving Capability Applications z Switching AC/DC Adaptor and Battery Charger z Open Frame Switching Power Supply Typical Application Leadtrend Technology Corporation LD7552D-DS-00 December 2007 1 www.leadtrend.com.tw Pin Configuration SOP-8 / DIP-8 (TOP VIEW) LD7552D OUT VCC CS NC 8 765 TOP MARK YYWW## 1 234 YY : Year code (D: 2004, E: 2005…..) WW : Week code ## : Production code GND COMP VCC CT Orde...