LD7552B

www.DataSheet4U.com LD7552B 1/2/2008 Green-Mode PWM Controller with Integrated Protections Rev. 01a General Description The LD7552B are low cost, low startup current, current mode PWM controllers with green-mode power- saving operation. The integrated functions include the Features z z z z z z z z z z z High-Voltage CMOS Process with Excellent ESD protection Very Low Startup Current (<20μA) 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 Pin OLP (Over Load Protection) 500mA Driving Capability leading-edge blanking of the current sensing, internal slope compensation. They provide the users a superior AC/DC power application of higher efficiency, low external component counts, and lower cost solution. Furthermore, LD7552B feature more protections like OLP (Over Load Protection) and OVP (Over Voltage Protection) to eliminate the external protection circuits. It is designed for the switching adaptor with 30W~60W output, offered in both SOP-8 and DIP-8 package. Applications z z z Switching AC/DC Adaptor and Battery Charger Open Frame Switching Power Supply 384X Replacement Typical Application AC input EMI Filter VCC 32V 16.0V /10.0V UVLO OUT RT COMP LD7552B OSC Control Logic photocoupler Divider CS GND TL431 1 Leadtrend Technology Corporation LD7552B-DS-01a January 2008 www.DataSheet4U.com ...