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PDF LM317J3 Data sheet ( Hoja de datos )
| Número de pieza | LM317J3 | |
| Descripción | Three Terminal 1.5A Adjustable Output Positive Voltage Regulators | |
| Fabricantes | CYStech Electronics | |
| Logotipo |  |
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CYStech Electronics Corp.
Three Terminal 1.5A Adjustable Output
Positive Voltage Regulators
LM317J3
Spec. No. : C513J3
Issued Date : 2007.12.19
Revised Date : 2010.07.22
Page No. : 1/12
The LM317J3 is an adjustable 3–terminal positive voltage regulator capable of supplying in excess of 1.5A
over an output voltage range of 1.3 V to 37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it employs internal current limiting,
thermal shutdown and safe area compensation, making it essentially blow–out proof.
The LM317J3 serves a wide variety of applications including local, on-card regulation. This device can also
be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment
and output, the LM317J3 can be used as a precision current regulator.
● Output current up to 1.5 A
● Output voltage adjustable between 1.3 V and 37 V
● Internal over temperature protection
● Internal short circuit protection
● Safe–area compensation for output transistor
● Pb-free package
Standard Application
Vin
+
Cin
0.1μF
PLLM313717
IAdj
R2
Vout
R1
+
Cout
1.0μF
＊Cin is required if regulator is located an appreciate
distance from power supply filter.
＊＊Cout is not needed for stability, however, it does
improve transient response.
Vout=1.25(1+R2/R1)+IAdjR2
Since IAdj is controlled to less than 100 μA, the
error associated with this term is negligible in
most applications.
Package Information
1 23
Pin Function
1 ADJ
2 OUTPUT
3 INPUT
TO-252
LM317J3
CYStek Product Specification
http://www.Datasheet4U.com
1 page  
CYStech Electronics Corp.
Spec. No. : C513J3
Issued Date : 2007.12.19
Revised Date : 2010.07.22
Page No. : 5/12
Load Regulation(mV)=Vo(min load)-Vo(max load)
Vo(min load)-Vo(max load)
Load Regulation(%Vo)=
×100
Vo(min load)
Fig 2. Load Regulation and ∆IAdj/Load test circuit
＊ Pulse testing required.
1% Duty Cycle is suggested.
To calculate R2: Vout=ISETR2+1.250V
Assume ISET=5.25mA
Fig 3. Standard Test Circuit
LM317J3
CYStek Product Specification
5 Page 
CYStech Electronics Corp.
Spec. No. : C513J3
Issued Date : 2007.12.19
Revised Date : 2010.07.22
Page No. : 11/12
Recommended wave soldering condition
Product
Peak Temperature
Pb-free devices
260 +0/-5 °C
Soldering Time
5 +1/-1 seconds
Recommended temperature profile for IR reflow
Profile feature
Sn-Pb eutectic Assembly
Pb-free Assembly
Average ramp-up rate
(Tsmax to Tp)
3°C/second max.
3°C/second max.
Preheat
−Temperature Min(TS min)
−Temperature Max(TS max)
−Time(ts min to ts max)
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
Time maintained above:
−Temperature (TL)
− Time (tL)
183°C
60-150 seconds
217°C
60-150 seconds
Peak Temperature(TP)
240 +0/-5 °C
260 +0/-5 °C
Time within 5°C of actual peak
temperature(tp)
10-30 seconds
20-40 seconds
Ramp down rate
6°C/second max.
6°C/second max.
Time 25 °C to peak temperature
6 minutes max.
8 minutes max.
Note : All temperatures refer to topside of the package, measured on the package body surface.
LM317J3
CYStek Product Specification
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM317J3.PDF ] | |
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