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LM5021 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM5021 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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LM5021 AC-DC Current Mode PWM Controller General Description The LM5021 off-line pulse width modulation (PWM) control- ler contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power con- verters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which mini- mizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, etc.). Additional features include under-voltage lock- out, cycle-by-cycle current limit, hiccup mode overload pro- tection, slope compensation, soft-start and oscillator syn- chronization capability. This high performance 8-pin IC has total propagation delays less than 100nS and a 1MHz ca- pable oscillator that is programmed with a single resistor. Features n Ultra Low Start-up Current (25 µA maximum) n Current Mode Control n Skip Cycle Mode for Low Standby Power n Single Resistor Programmable Oscillator n Synchronizable Oscillator n Adjustable Soft-start n Integrated 0.7A Peak Gate Driver n Direct Opto-Coupler Interface n Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2) n Slope Compensation for (LM5021-1 Only) n Under Voltage Lockout (UVLO) with Hysteresis 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 May 2005 © 2005 National Semiconductor Corporation DS201442 www.national.com |
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