LD7577

LD7577 1/15/2009 High Voltage Green-Mode PWM Controller with Brown-Out Protection Rev. 01 General Description The LD7577 integrates several functions of protections, and EMI-improved solution in SOP-8 package. It minimizes the component counts and the circuit space. The device provides functions of low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. Also, it features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and brownout protection to prevent the circuit from being damaged under abnormal conditions. Features z z z z z z z z z z z 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 Internal Slope Compensation OVP (Over Voltage Protection) on Vcc Pin AC Input OVP (Over Voltage Protection) OLP (Over Load Protection) Precision Brownout Protection 500mA Driving Capability Applications z z z Switching AC/DC Adaptor and Battery Charger Open Frame Switching Power Supply LCD Monitor/TV Power Typical Application AC input EMI Filter * HV VCC OUT LD7577 BNO GND CS COMP * photocoupler TL431 *See Application Information 1 Leadtrend Technology Corporation LD7577-DS-01 January 2009 www.leadtrend.com.tw LD7577 Pin Configuration SOP-8 & DIP-8 (TOP VIEW) OUT 5 8 7 VCC 6 NC HV TOP MARK YYWWPP 1 2 3 4 YY: WW: PP: Year code Week code Production c...