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LM2596T-ADJ/LF02 参数 Datasheet PDF下载

LM2596T-ADJ/LF02图片预览
型号: LM2596T-ADJ/LF02
PDF下载: 下载PDF文件 查看货源
内容描述: LM2596 SIMPLE SWITCHER电源转换器150千赫3A降压型稳压器 [LM2596 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator]
分类和应用: 转换器稳压器
文件页数/大小: 42 页 / 4730 K
品牌: TI [ TEXAS INSTRUMENTS ]
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LM2596  
SNVS124C NOVEMBER 1999REVISED APRIL 2013  
www.ti.com  
Solid tantalum capacitors have a much better ESR spec for cold temperatures and are recommended for  
temperatures below 25°C.  
Figure 26. Capacitor ESR vs Capacitor Voltage Rating (Typical Low ESR Electrolytic Capacitor)  
CATCH DIODE  
Buck regulators require a diode to provide a return path for the inductor current when the switch turns off. This  
must be a fast diode and must be located close to the LM2596 using short leads and short printed circuit traces.  
Because of their very fast switching speed and low forward voltage drop, Schottky diodes provide the best  
performance, especially in low output voltage applications (5V and lower). Ultra-fast recovery, or High-Efficiency  
rectifiers are also a good choice, but some types with an abrupt turnoff characteristic may cause instability or  
EMI problems. Ultra-fast recovery diodes typically have reverse recovery times of 50 ns or less. Rectifiers such  
as the 1N5400 series are much too slow and should not be used.  
Figure 27. Capacitor ESR Change vs Temperature  
INDUCTOR SELECTION  
All switching regulators have two basic modes of operation; continuous and discontinuous. The difference  
between the two types relates to the inductor current, whether it is flowing continuously, or if it drops to zero for a  
period of time in the normal switching cycle. Each mode has distinctively different operating characteristics,  
which can affect the regulators performance and requirements. Most switcher designs will operate in the  
discontinuous mode when the load current is low.  
The LM2596 (or any of the Simple Switcher family) can be used for both continuous or discontinuous modes of  
operation.  
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Copyright © 1999–2013, Texas Instruments Incorporated  
Product Folder Links: LM2596