Texas Instruments LM5023

Description

The LM5023 is a Quasi-Resonant Pulse Width Modulated (PWM) controller which contains all of the features needed to implement a highly efficient off-line power supply. The LM5023 uses the transformer auxiliary winding for demagnetization detection to ensure Critical Conduction Mode (CCM) operation. The LM5023 features a hiccup mode for over current protection with an auto restart to reduce the stress on the power components during an overload. A skip cycle mode which reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, etc.). The LM5023 also uses the transformer auxiliary winding for output overvoltage (OVP) protection, if an OVP fault is detected the LM5023 latches off the controller.

Features

• Critical Conduction Mode
• Peak Current Mode Control Mode
• Skip Cycle Mode for Low Standby Power
• Hiccup Mode for Continuous Overload Protection
• Cycle-by-Cycle Over-Current Protection MaintainsAccuracy over the Universal AC Line
• Line Current Feed Forward
• OVP Protection by Sensing the Aux Winding
• Integrated 0.7 A Peak Gate Driver
• Direct Opto-Coupler Interface
• Leading Edge Blanking of Current Sense Signal
• Maximum Frequency Clamp 130 kHz
• Programmable Soft Start
• Thermal Shutdown
• 8-Pin MSOP Package

Typical applications

• Consumer Electronics
• Universal Input AC-DC Notebook Adapters 10 W to 65 W
• High Efficiency Housekeeping and Auxiliary Power
• Battery Chargers

More information

• Datasheet
• IC product information