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LM5020

更新时间： 2024-11-13 22:47:03
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
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12页 229K
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100V Current Mode PWM Controller

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LM5020 数据手册

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October 2004  
LM5020  
100V Current Mode PWM Controller  
General Description  
Features  
n Internal Start-up Bias Regulator  
n Error Amplifier  
The LM5020 high voltage pulse-width-modulation (PWM)  
controller contains all of the features needed to implement  
single ended primary power converter topologies. Output  
voltage regulation is based on current-mode control, which  
eases the design of loop compensation while providing in-  
herent line feed-forward. The LM5020 includes a high-  
voltage start-up regulator that operates over a wide input  
range up to 100V. The PWM controller is designed for high  
speed capability including an oscillator frequency range to  
1MHz and total propagation delays less than 100ns. Addi-  
tional features include an error amplifier, precision reference,  
line under-voltage lockout, cycle-by-cycle current limit, slope  
compensation, softstart, oscillator synchronization capability  
and thermal shutdown. The controller is available in both  
MSOP-10 and LLP-10 packages.  
n Precision Voltage Reference  
n Programmable Softstart  
n 1A Peak Gate Driver  
n Maximum Duty Cycle Limiting (80% for LM5020-1 or  
50% for LM5020-2)  
n Programmable Line Under Voltage Lockout (UVLO) with  
Adjustable Hysteresis  
n Cycle-by-Cycle Over-Current Protection  
n Slope Compensation (LM5020-1)  
n Programmable Oscillator Frequency with  
Synchronization Capability  
n Current Sense Leading Edge Blanking  
n Thermal Shutdown Protection  
Packages  
n MSOP-10  
n LLP-10 (4 mm x 4 mm)  
Connection Diagram  
Top View  
20095001  
10-Lead MSOP, LLP  
Ordering Information  
Order Number  
Description  
NSC Package Drawing  
MUB-10A  
Supplied As  
LM5020MM-1  
LM5020MMX-1  
LM5020SD-1  
LM5020SDX-1  
LM5020MM-2  
LM5020MMX-2  
LM5020SD-2  
LM5020SDX-2  
MSOP, 80% Duty Cycle Limit  
MSOP, 80% Duty Cycle Limit  
LLP, 80% Duty Cycle Limit  
LLP, 80% Duty Cycle Limit  
MSOP, 50% Duty Cycle Limit  
MSOP, 50% Duty Cycle Limit  
LLP, 50% Duty Cycle Limit  
LLP, 50% Duty Cycle Limit  
1000 Units on Tape and Reel  
3500 Units on Tape and Reel  
1000 Units on Tape and Reel  
4500 Units on Tape and Reel  
1000 Units on Tape and Reel  
3500 Units on Tape and Reel  
1000 Units on Tape and Reel  
4500 Units on Tape and Reel  
MUB-10A  
SDC-10A  
SDC-10A  
MUB-10A  
MUB-10A  
SDC-10A  
SDC-10A  
© 2004 National Semiconductor Corporation  
DS200950  
www.national.com  
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