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PDF LM317E3 Data sheet ( Hoja de datos )
| Número de pieza | LM317E3 | |
| Descripción | Three Terminal Adjustable Output Positive Voltage Regulators | |
| Fabricantes | Cystech Electonics | |
| Logotipo |  |
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CYStech Electronics Corp.
Three Terminal Adjustable Output
Positive Voltage Regulators
LM317E3
wSIspwseuwce.d.DNDaoa.tat:eSC:h52e10e30tE343.U0.4c.o09m
Revised Date :2005.05.17
Page No. : 1/10
The LM317E3 is an adjustable 3–terminal positive voltage regulator capable
of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V.
This voltage regulator is exceptionally easy to use and requires only two ex-
ternal 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 LM317E3 serves a wide variety of applications including local, on-card
regulation. This device can also be used to make a programmable output regu-
lator, or by connecting a fixed resistor between the adjustment and output, the
LM317E3 can be used as a precision current regulator.
● Output Current in Excess of 1.5 A
● Output Adjustable between 1.2 V and 37 V
● Internal Thermal Overload Protection
● Internal Short Circuit Current Limiting Constant with Temperature
● Output Transistor Safe–Area Compensation
● Floating Operation for High Voltage Applications
● Eliminates Stocking many Fixed Voltages
TO-220AB
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.
Maximum Ratings
Rating
Input-Output Voltage Differential
Power Dissipation
TA=25℃
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
Operating Junction Temperature Range
Storage Temperature Range
LM317E3
Symbol
VI-VO
Value
40
Unit
V
PD Internally Limited
W
θJA 65 ℃/W
θJC 5.0 ℃/W
TJ -40 to +125
℃
Tstg -65 to +150
℃
CYStek Product Specification
1 page  
CYStech Electronics Corp.
wSIspwseuwce.d.DNDaoa.tat:eSC:h52e10e30tE343.U0.4c.o09m
Revised Date :2005.05.17
Page No. : 5/10
Vin
VI
Cin 0.1µF
LPML331177
Vout
Adjust
IAdj
R1%1
IL
Co
+ 1µF
R2
1%
RL
(max load)
*
Vo(min load)
Vo(max load)
RL
(min load)
*Pulse testing required.
1% Duty Cycle is suggest
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
Vin Vout
PLLM331177
IL
Adjust
IAdj
R1%1 Vref
Cin 0.1µF
VI
ISET
R1%2
+ 1µF
Co
RL
Vo
＊ Pulse testing required.
1% Duty Cycle is suggested.
To calculate R2: Vout=ISETR2+1.250V
Assume ISET=5.25mA
Fig 3. Standard Test Circuit
LM317E3
CYStek Product Specification
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM317E3.PDF ] | |
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