LD7660J

LD7660J 5/21/2009 Low Power Off-line Switcher P03 (Internal use only) General Description The LD7660J integrated a 600V power MOSFET and a current mode PWM controller in a DIP-8 package. It’s operating at fixed frequency of 65 kHz. It provides important functions needed for a low output power applications such as leading-edge blanking of the current sensing, internal slope compensation, and green-mode power-saving operation under light load or no load condition. This highly integrated device provides the users a high efficiency, low external component counts, and low cost solution for low power adaptor or charger applications. The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7660J is operating under light load or no load condition. Features z z z z z z z z z z z z z Built-in 600V/1A Power MOSFET Secondary-side/Primary-side feedback control Switching Frequency at 65KHz Fixed Internal Frequency Trembling Built-in Load Regulation Compensation Built-in Slope Compensation with 75% max duty-cycle Low Startup Current (<20μA) Current Mode Control with Cycle-by-Cycle Current Limit Non-audible-noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin OVP (Over Voltage Protection) on Vcc OLP (Over Load Protection) Applications z z Switching AC/DC Adaptor LCD TV or PC Standby Power Typical Application Secondary-side Feedback 1 Leadtrend Technology Corporati...