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LM5021NA-2 PDF预览

LM5021NA-2

更新时间: 2024-11-22 22:10:11
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
页数 文件大小 规格书
15页 745K
描述
AC-DC Current Mode PWM Controller

LM5021NA-2 数据手册

 浏览型号LM5021NA-2的Datasheet PDF文件第2页浏览型号LM5021NA-2的Datasheet PDF文件第3页浏览型号LM5021NA-2的Datasheet PDF文件第4页浏览型号LM5021NA-2的Datasheet PDF文件第5页浏览型号LM5021NA-2的Datasheet PDF文件第6页浏览型号LM5021NA-2的Datasheet PDF文件第7页 
May 2005  
LM5021  
AC-DC Current Mode PWM Controller  
General Description  
Features  
n Ultra Low Start-up Current (25 µA maximum)  
n Current Mode Control  
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.  
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  
© 2005 National Semiconductor Corporation  
DS201442  
www.national.com  

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