LD7578

LD7578 10/08/2008 Green-Mode PWM Controller with HV Start-Up Circuit and OTP Protection Rev.00 General Description Features The LD7578 integrates several functions of protections in a 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, the LD7578 features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and external OTP (Over Temperature Protection) to prevent the circuit from being damaged under abnormal conditions. 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 Internal Slope Compensation z OVP (Over Voltage Protection) on Vcc z OLP (Over Load Protection) z OTP through a NTC/Latch-Off Mode z 500mA Driving Capability Applications z Switching AC/DC Adaptor and Battery Charger z Open Frame Switching Power Supply z LCD Monitor/TV Power Typical Application AC input EMI Filter * HV VCC OUT LD7578 (-)LATCH CS GND COMP * *See Application Information photocoupler TL431 Leadtrend Technology Corporation LD7578-DS-00 October 2008 1 www.leadtrend.com.tw Pin Configuration SOP-8 & DIP-8 (TOP VIEW) HV NC VCC OUT 8 76 5 TOP MARK YYWWPP 1234 YY: WW: PP: Year code Week code Production code LD7578 (-) LATCH COMP CS GND Or...