LD7577JA

LD7577JA 8/16/2010 High Voltage Green-Mode PWM Controller with Brown-Out Protection Rev. 00b General Description The LD7577JA integrated several functions of protections, and EMI-improved solution in a SOP-7, SOP-8/or DIP-8 package. It minimizes the component counts and the circuit space, and it’s perfect for the low cost of applications. It provides functions of low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. Also, the LD7577JA features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and brownout protection to prevent the circuit being damaged from the abnormal conditions. Furthermore, the LD7577JA features frequency trembling to suppress the noise and is an excellent solution for EMI filter design. Features z z 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 Frequency Trembling Internal Slope Compensation Internal Over Current compensation OVP (Over Voltage Protection) on Vcc AC Input OVP (Over Voltage Protection) OLP (Over Load Protection) 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 LD7577JA BNO GND CS COMP * photocoupler TL431 *See...