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LM432BA3 参数 Datasheet PDF下载

LM432BA3图片预览
型号: LM432BA3
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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CYStech Electronics Corp.
Adjustable shunt regulator
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 1/9
LM432XA3/N3
Description
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(V
REF
) 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
the LM432 an excellent replacement for zener diodes.
The LM432 shunt regulator is available with four
voltage tolerances(0.25%,0.5%,1% and 2%), and two
package options(TO-92 and SOT-23). This allows the
designer the opportunity to select the optimum combi-
nation of cost and performance for their application.
Features
◆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
Applications
◆Linear
Regulators
◆Adjustable
Supplies
◆Switching
Power Supplies
◆Battery
Operated Computers
◆Instrumentation
◆Computer
Disk Drives
Typical Application Circuit
(Note 1,2)
Notes:
VIN
R
VOUT
R1
VREF
PL432
LM432
R2
GND
1) Set V
OUT
according to the following equation:
V
OUT
=V
REF
(1+R1/R2)+I
REF
R1
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 VI
N(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:
Rmin≥V
IN(max)
/150mA(to limit instantaneous
turn-on Iz)
Rmin≥
V
IN(max)
-V
OUT
(to limit Iz under
I
OUT(min)
+100mA normal operating
conditions)
LM432XA3/N3
CYStek Product Specification