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LM138KSTEEL-MIL

更新时间： 2024-09-28 13:09:19
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器
页数 文件大小 规格书
16页 399K
描述
IC,VOLT REGULATOR,ADJUSTABLE,+1.2 TO +32V,BIPOLAR,TO-204/-3,3PIN,METAL

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LM138KSTEEL-MIL 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：, TO-204/-3Reach Compliance Code：compliant
风险等级：5.86可调性：ADJUSTABLE
标称回动电压 1：3 VJESD-609代码：e0
最大电网调整率 (%/V)：0.04最大负载调整率 (%)：0.6%
输出次数：1端子数量：3
工作温度TJ-Max：150 °C工作温度TJ-Min：-55 °C
最大输出电流 1：5 A最大输出电压 1：32 V
最小输出电压 1：1.2 V封装主体材料：METAL
封装等效代码：TO-204/-3认证状态：Not Qualified
筛选级别：MIL-STD-883 Class B (Modified)子类别：Other Regulators
技术：BIPOLAR端子面层：Tin/Lead (Sn/Pb)
Base Number Matches：1

LM138KSTEEL-MIL 数据手册

 浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第2页浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第3页浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第4页浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第5页浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第6页浏览型号LM138KSTEEL-MIL的Datasheet PDF文件第7页 
May 1998  
LM138/LM338  
5-Amp Adjustable Regulators  
Besides replacing fixed regulators or discrete designs, the  
LM138 is useful in a wide variety of other applications. Since  
the regulator is “floating” and sees only the input-to-output  
differential voltage, supplies of several hundred volts can be  
regulated as long as the maximum input to output differential  
is not exceeded, i.e., do not short-circuit output to ground.  
The part numbers in the LM138 series which have a K suffix  
are packaged in a standard Steel TO-3 package, while those  
with a T suffix are packaged in a TO-220 plastic package.  
The LM138 is rated for −55˚C ≤ TJ ≤ +150˚C, and the LM338  
is rated for 0˚C ≤ TJ ≤ +125˚C.  
General Description  
The LM138 series of adjustable 3-terminal positive voltage  
regulators is capable of supplying in excess of 5A over a  
1.2V to 32V output range. They are exceptionally easy to  
use and require only 2 resistors to set the output voltage.  
Careful circuit design has resulted in outstanding load and  
line regulation — comparable to many commercial power  
supplies. The LM138 family is supplied in a standard 3-lead  
transistor package.  
A unique feature of the LM138 family is time-dependent cur-  
rent limiting. The current limit circuitry allows peak currents  
of up to 12A to be drawn from the regulator for short periods  
of time. This allows the LM138 to be used with heavy tran-  
sient loads and speeds start-up under full-load conditions.  
Under sustained loading conditions, the current limit de-  
creases to a safe value protecting the regulator. Also in-  
cluded on the chip are thermal overload protection and safe  
area protection for the power transistor. Overload protection  
remains functional even if the adjustment pin is accidentally  
disconnected.  
Features  
n Guaranteed 7A peak output current  
n Guaranteed 5A output current  
n Adjustable output down to 1.2V  
n Guaranteed thermal regulation  
n Current limit constant with temperature  
n P+ Product Enhancement tested  
n Output is short-circuit protected  
Normally, no capacitors are needed unless the device is situ-  
ated more than 6 inches from the input filter capacitors in  
which case an input bypass is needed. An output capacitor  
can be added to improve transient response, while bypass-  
ing the adjustment pin will increase the regulator’s ripple re-  
jection.  
Applications  
n Adjustable power supplies  
n Constant current regulators  
n Battery chargers  
Connection Diagrams (See Physical Dimension section for further information)  
(TO-3 STEEL)  
Metal Can Package  
(TO-220)  
Plastic Package  
DS009060-31  
Front View  
Order Number LM338T  
See NS Package Number T03B  
DS009060-30  
Bottom View  
Order Number LM138K STEEL or LM338K STEEL  
See NS Package Number K02A  
© 1999 National Semiconductor Corporation  
DS009060  
www.national.com  
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