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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. : 1/9  
CYStech Electronics Corp.  
Adjustable shunt regulator  
LM432XA3/N3  
Description  
Features  
The LM432 is a three terminal adjustable shunt  
regulator with thermal stability guaranteed over  
temperature. The output voltage can be adjusted  
to any value from 1.24V(VREF) to 20V with two  
external resistors. The LM432 has a typical dynamic  
output impedance of 0.05Ω. Active output circuitry  
provides a very sharp turn on characteristic, making  
Low voltage operation(down to 1.24V)  
Wide operating current range 80μA to 100mA  
Low dynamic output impedance 0.05Ω typ.  
Trimmed bandgap design ±0.25%  
Upgrade for LM431  
Available in TO-92 and SOT-23 packages  
the LM432 an excellent replacement for zener diodes. Applications  
The LM432 shunt regulator is available with four  
voltage tolerances(0.25%,0.5%,1% and 2%), and two  
Linear Regulators  
Adjustable Supplies  
package options(TO-92 and SOT-23). This allows the Switching Power Supplies  
designer the opportunity to select the optimum combi- Battery Operated Computers  
nation of cost and performance for their application.  
Instrumentation  
Computer Disk Drives  
Typical Application Circuit(Note 1,2)  
Notes:  
1) Set VOUT according to the following equation:  
R
VIN  
VOUT  
VOUT=VREF(1+R1/R2)+IREFR1  
2) Choose the value for R as follows:  
˙The maximum limit for R should be such that the  
cathode current, Iz, is greater than the minimum  
operating current(80μA) at VIN(MIN).  
˙The minimum limit for R should be as such that Iz  
does not exceed 100mA under all load conditions,  
and the instantaneous turn-on value for Iz does not  
exceed 150mA. Both of the following conditions  
must be met:  
R1  
VREF  
LM432  
R2  
GND  
RminVIN(max)/150mA(to limit instantaneous  
turn-on Iz)  
RminVIN(max)-VOUT  
(to limit Iz under  
IOUT(min)+100mA normal operating  
conditions)  
LM432XA3/N3  
CYStek Product Specification