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A700X277M0004AT

更新时间： 2024-02-01 13:27:43
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
17页 892K
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LM5020 100V Current Mode PWM Controller

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LM5020  
www.ti.com  
SNVS275F –MAY 2004–REVISED APRIL 2006  
LM5020 100V Current Mode PWM Controller  
Check for Samples: LM5020  
1
FEATURES  
PACKAGES  
2
•
•
•
•
•
•
Internal Start-up Bias Regulator  
Error Amplifier  
•
•
VSSOP-10  
WSON-10 (4 mm x 4 mm)  
Precision Voltage Reference  
Programmable Softstart  
1A Peak Gate Driver  
DESCRIPTION  
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 inherent 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.  
Additional 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 VSSOP-  
10 and WSON-10 packages.  
Maximum Duty Cycle Limiting (80% for  
LM5020-1 or 50% for LM5020-2)  
•
Programmable Line Under Voltage Lockout  
(UVLO) with Adjustable Hysteresis  
•
•
•
Cycle-by-Cycle Over-Current Protection  
Slope Compensation (LM5020-1)  
Programmable Oscillator Frequency with  
Synchronization Capability  
•
•
Current Sense Leading Edge Blanking  
Thermal Shutdown Protection  
APPLICATIONS  
•
•
•
Telecommunication Power Converters  
Industrial Power Converters  
+42V Automotive Systems  
Typical Application Circuit  
V
IN  
VIN  
V
VCC  
OUT  
LM5020  
UVLO  
SS  
OUT  
CS  
RT SYNC  
/
FB  
GND  
COMP  
COMPENSATION  
Figure 1. Non-Isolated Flyback Converter  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2004–2006, Texas Instruments Incorporated  
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