LM5021
Overview
The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network.
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- Ultra Low Start-up Current (25 µA maximum) Current Mode Control Skip Cycle Mode for Low Standby Power Single Resistor Programmable Oscillator Synchronizable Oscillator Adjustable Soft-start Integrated 0.7A Peak Gate Driver Direct Opto-Coupler Interface Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2) Slope Compensation for (LM5021-1 Only) Under Voltage Lockout (UVLO) with Hysteresis Cycle-by-Cycle Over-Current Protection Hiccup Mode for Continuous Overload Protection Leading Edge Blanking of Current Sense Signal Packages: MSOP-8 or MDIP-8 Simplified Application Diagram 20144201 © 2005 National Semiconductor Corporation DS201442 LM5021 Connection Diagram Top View 20144202 MSOP-8 and MDIP-8
