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LM5026

更新时间: 2024-11-22 22:47:03
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
23页 932K
描述
Active Clamp Current Mode PWM Controller

LM5026 数据手册

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August 2005  
LM5026  
Active Clamp Current Mode PWM Controller  
General Description  
Features  
n Current Mode Control  
The LM5026 PWM controller contains all of the features  
necessary 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 configured to control either a P-Channel or  
N-Channel clamp switch. The main gate driver features a  
compound configuration, consisting of both MOS  
and Bipolar devices, providing superior gate drive character-  
istics. The LM5026 can be configured 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-cycle current limit, hiccup  
mode fault operation with adjustable timeout delay, PWM  
slope compensation, soft-start, 1MHz capable oscillator with  
synchronization input / output capability, precision reference  
and thermal shutdown.  
n Internal 100V Start-up Bias Regulator  
n 3A Compound Main Gate Driver  
n High Bandwidth Opto-coupler Interface  
n Programmable Line Under-Voltage Lockout (UVLO) with  
Adjustable Hysteresis  
n Versatile Dual Mode Over-Current Protection with hiccup  
delay timer  
n Programmable Overlap or Deadtime between the Main  
and Active Clamp Outputs  
n Programmable Maximum Duty Cycle Clamp  
n Programmable Soft-start  
n Leading Edge Blanking  
n Resistor Programmed 1MHz Capable Oscillator  
n Oscillator Sync I/O Capability  
n Precision 5V Reference  
Packages  
n TSSOP-16  
n LLP-16 (5x5 mm) Thermally Enhanced (Available  
Soon)  
Typical Application Circuit  
20147901  
Simplified Forward Power Converter with Active Clamp Reset  
© 2005 National Semiconductor Corporation  
DS201479  
www.national.com  

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