LD7750

LD7750 2/23/2010 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00b General Description The LD7750 integrates several functions of protections, and EMI-improved solution in a SOP-8, SOP-7, or DIP-8 package to minimize the component counts and the circuit space. The device provides functions of low startup current, green-mode compensation. Voltage power-saving Also, the operation, LD7750 OTP leading-edge features more blanking of the current sensing and internal slope protections like OLP (Over Load Protection), OVP (Over Protection), and (Over Temperature Protection) to prevent the circuit being damaged under the abnormal conditions. The LD7750 features built-in auto-recovery function for OVP on Vcc pin and OLP. Furthermore, the LD7750 features frequency swapping to depress radiation noise, providing an excellent solution for EMI filter design. Features 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 Swapping Internal Slope Compensation Internal Over Current Protection OVP (Over Voltage Protection) on Vcc OLP (Over Load Protection) External OTP through a NTC 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 OTP LD7750 CS GND COMP * phot...