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LM432BN3 参数 Datasheet PDF下载

LM432BN3图片预览
型号: LM432BN3
PDF下载: 下载PDF文件 查看货源
内容描述: 可调并联稳压器 [Adjustable shunt regulator]
分类和应用: 稳压器
文件页数/大小: 9 页 / 225 K
品牌: CYSTEKEC [ CYSTECH ELECTONICS CORP. ]
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Spec. No. : C504N3  
Issued Date : 2003.03.21  
Revised Date : 2005.10.07  
Page No. : 7/9  
CYStech Electronics Corp.  
R
OUT  
Iz  
Iz  
R1  
10£gF 15k  
232  
LM432  
CL  
LM432  
8.25k  
R2  
GND  
Applications Information - Stability  
Selection of load capacitance when using LM432 as a shunt regulator  
When the LM432 is used as a shunt regulator, two options for selection of CL(see diagram on page 6)  
are recommended for optimal stability:  
1) No load capacitance across the device, decouple at the load.  
2) Large capacitance across the device, optimal decoupling at the load.  
The reason for this is that LM432 exhibits instability with capacitances in the range of 10nF to 1μF  
(approx.) at light cathode currents(up to 3mA typical). The device is less stable the lower the cathode  
voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode  
current of (say) 10mAwith a 0.1μF capacitor across it, it will oscillate transiently during start-up as the  
cathode current passes through the instability region. Selecting a very low (or preferably, no) capaci-  
tance, or alternatively a high capacitance(such as 10μF) will avoid this issue altogether. Since the user  
will probably wish to have local decoupling at the load anyway, the most cost effective method is to use  
no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the  
local load decoupling from causing the oscillation during the transient start-up phase.  
Note : if the LM432 is located right at the load, so the load decoupling capacitor is directly across it,  
then this capacitor will have to be 1nF or 10μF.  
LM432XA3/N3  
CYStek Product Specification