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LM5026_09 PDF预览

LM5026_09

更新时间: 2024-11-23 05:42:23
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
22页 650K
描述
Active Clamp Current Mode PWM Controller

LM5026_09 数据手册

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January 15, 2009  
LM5026  
Active Clamp Current Mode PWM Controller  
General Description  
Features  
The LM5026 PWM controller contains all of the features nec-  
essary to implement power converters utilizing the active  
clamp / reset technique with current mode control. With the  
active clamp technique, higher efficiencies and greater power  
densities can be realized compared to conventional catch  
winding or RDC clamp / reset techniques. Two control outputs  
are provided, the main power switch control (OUT_A) and the  
active clamp switch control (OUT_B). The device can be con-  
figured to control either a P-Channel or N-Channel clamp  
switch. The main gate driver features a compound configu-  
ration, consisting of both MOS and Bipolar devices, providing  
superior gate drive characteristics. The LM5026 can be con-  
figured to operate with bias voltages over a wide input range  
of 8V to 100V. Additional features include programmable  
maximum duty cycle, line under-voltage lockout, cycle-by-cy-  
cle current limit, hiccup mode fault operation with adjustable  
timeout delay, PWM slope compensation, soft-start, 1MHz  
capable oscillator with synchronization input / output capabil-  
ity, precision reference and thermal shutdown.  
Current Mode Control  
Internal 100V Start-up Bias Regulator  
3A Compound Main Gate Driver  
High Bandwidth Opto-coupler Interface  
Programmable Line Under-Voltage Lockout (UVLO) with  
Adjustable Hysteresis  
Versatile Dual Mode Over-Current Protection with hiccup  
delay timer  
Programmable Overlap or Deadtime between the Main  
and Active Clamp Outputs  
Programmable Maximum Duty Cycle Clamp  
Programmable Soft-start  
Leading Edge Blanking  
Resistor Programmed 1MHz Capable Oscillator  
Oscillator Sync I/O Capability  
Precision 5V Reference  
Packages  
TSSOP-16  
LLP-16 (5x5 mm) Thermally Enhanced  
Typical Application Circuit  
20147901  
Simplified Forward Power Converter with Active Clamp Reset  
© 2009 National Semiconductor Corporation  
201479  
www.national.com  

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