Part # LM5021 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM5021 AC-DC Current Mode PWM Controller

Part Details:

LM5021 June 2005 AC-DC LM5021AC-DC Current Mode PWM ControllerGeneral Description Features Current The LM5021 off-line pulse width modulation (PWM) control- n Ultra Low Start-up Current (25 µA maximum) ler contains all of the features needed to implement highly n Current Mode Control efficient off-line single-ended flyback and forward power con- n Skip Cycle Mode for Low Standby Power verters using current-mode control. The LM5021 features n Single Resistor Programmable Oscillator include an ultra-low (25 µA) start-up current, which mini- Mode n Synchronizable Oscillator mizes power losses in the high voltage start-up network. A n Adjustable Soft-start skip cycle mode reduces power consumption with light loadsfor energy conserving applications (ENERGY STAR®, n Integrated 0.7A Peak Gate Driver CECP, etc.). Additional features include under-voltage lock- n Direct Opto-Coupler Interface PWM out, cycle-by-cycle current limit, hiccup mode overload pro- n Maximum Duty Cycle Limiting (80% for LM5021-1 or tection, slope compensation, soft-start and oscillator syn- 50% for LM5021-2) chronization capability. This high performance 8-pin IC has n Slope Compensation for (LM5021-1 Only) total propagation delays less than 100nS and a 1MHz ca- n Under Voltage Lockout (UVLO) with Hysteresis Controller pable oscillator that is programmed with a single resistor. n Cycle-by-Cycle Over-Current Protection n Hiccup Mode for Continuous Overload Protection n Leading Edge Blanking of Current Sense Signal n Packages: MSOP-8 or MDIP-8 Simplified Application Diagram 20144201 © 2005 National Semiconductor Corporation DS201442 Connection Diagram LM5021 Top View 20144202 MSOP-8 and MDIP-8 Ordering Information Order Number Description Package Type Supplied As

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LM5021.pdf Datasheet