LD7921

LD7921 02/02/2012 Primary-Side PWM Power Switch with CV/CC Operation Ver. 00 General Description The LD7921 integrated a 700V power MOSFET and a primary-side feedback PWM controller with CV/CC operation in a SOP-6/DIP-7 package. The LD7921 is designed for low power adapter/charger and LED lighting applications. It minimizes the components counts and is available in tiny packages. Those make it an ideal design for low cost applications. The LD7921 provides constant voltage, constant current (CV/CC) operation requiring neither photo-coupler nor secondary control circuit. Also, the LD7921 features OTP (Over Temperature Protection) and OVP (Over Voltage Protection) to prevent the circuit from being damaged under abnormal conditions. Features z Built-in 700V Power MOSFET z Primary-side Feedback Control z Constant Current Control z Built-in Load Regulation Compensation z Built-in Primary Winding Inductance Compensation z Low Startup Current (<16μA) z Current Mode Control with Cycle-by-Cycle Current Limit z Green Mode Control z UVLO (Under Voltage Lockout) z LEB (Leading-Edge Blanking) on CS Pin z OVP (Over Voltage Protection) on Vcc z OTP (Over Temperature Protection) Applications z AC-DC Adapter and Charger z AC-DC LED Lighting Typical Application Leadtrend Technology Corporation LD7921-DS-00 February 2012 1 www.leadtrend.com.tw Pin Configuration SOP-6 (TOP VIEW) DIP-7 (TOP VIEW) LD7921 VCC DRAIN VCC DRAIN DRAIN 85 TOP MARK YYWWPP 1 234 8 65 TOP MARK YYWWPP 1 234 YY: W...