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LM317 LINEAR INTEGRATED CIRCUIT
3-TERMINAL 1A POSITIVE
ADJUSTABLE VOLTAGE
REGULATOR
DESCRIPTION
The
voltage regulator, designed to supply more than 1.5A of
output current with voltage adjustable from 1.
3to37v
LM317 is an adjustable 3-terminal positive
Contek
FEATURES
*Output current up to 1.5A.
*Output voltage adjustable from 1.3V to 37V.
*Internal short circuit protection.
*Internal over temperature protection.
* Safe-Area compensation for output transistor.
BLOCK DIAGRAM
INPUT
1
1
1
1:ADJ 2:Output 3:Input
TO-220
TO-263
TO-252
CONTEK
PROTECTION
VREF
Contek
VAd j
CIRCUIT
OUTPUT
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
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LM317 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25 C, UNLESS OTHERWISE SPECIFIED)
PARAMETER SYMBOL VALUE UNIT
Input - Output Voltage Difference VI-VO 40 V
Lead Temperature TLEAD 230 C
Power Dissipation PD Internal limited
Operating Temperature Range TOPR 0~125 C
Storage Temperature Range TSTG -65~150 C
Contek LM317 ELECTRICAL CHARACTERISTICS
(VI-VO=5V, 0 C <Tj<125 C,IO=500mA,IMAX=1.5A,PMAX=20W , unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Line Regulation DVO Ta=25 C,3V<=VI-VO<=40V 0.01 0.04 %/V
Ta=0 - 125 C,3V<=VI-VO<=40V 0.02 0.07 %/V
Ta=25 C VO<=6V 18 25 mV
Load Regulation DVO 10mA<=IO<=IMAX VO>=5V 0.4 0.5 %/VO
10mA<=IO<=IMAX VO<=5V 40 70 mV
VO>=6V 0.8 1.5 %/VO
Adjustable Pin Current IADJ 46 100 mA
Adjustable Pin Current
Change
Reference Voltage VREF 3V<=VI-VO<=40V,
Temperature Stability STT 0.7 %/VO
Minimum Load Current
for Regulation
Maximum Output
Current
RMS Noise v.s.
%of Vout
Ripple Rejection RR VO=10V,f=120HZ, 60 dB
Long-term
Stability,TJ=THIGH
Junction to Case
Thermal Resistance
Note: Testing with low duty pulse should be used to avoid heating effect.
DIADJ 2.5V<=VI-VO<=40V,
10mA<=Io<=IMAX, PD<=PMAX
1.20 1.25 1.30 V
10mA<=IO<=IMAX,PD<=PMAX
IL(MIN) VI-VO=40V 3.5 10 mA
IO(MAX) VI-VO<=15V, PD<=PMAX 1.5 2.2 A
VI-VO<=15V, PD<=PMAX,Ta=25 C 0.15 0.4
eN TA=25 C,10HZ<=f<=10KHZ 0.003 0.01 %/VO
VO=10V,f=120HZ,CADJ=10 mF75
ST TA=25 C,1000 hr 66 0.3 1 %
R q JC 5 C/W
2.0 5 mA
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LM317 LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
Fig.1. Load Regulation vs
Vi=15V
Vo=10V
temperature
50
75 100 125
0.2
0.0
-0.2
-0.4
-0.6
Output Voltage Deviation
-0.8
-1.0
025
Temperature
Fig.3. Dropout Voltage vs Input-
Output Voltage Difference
DVo=100mV
IL=1.5A
IL=1A
IL=500mA
IL=200mA
IL=20mA
0 25 50 75 100 125
Temperature
Difference
Input-Output Voltage
3.0
2.5
2.0
1.5
1.0
Fig.2 Adjustment Current vs Temperature
60
55
50
45
Adjustment Current
40
35
-50 -25 0 25 50 75 100 125
Temperature
Fig.4 Reference Voltage vs Temperature
1.260
1.255
1.250
1.245
Reference Voltage
1.240
1.235
-50 -25 0 25 50 75 100 125
Temperature
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LM317 LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
Vi
C1
0.1 mF
Fig.5 Programmable voltage regulator
Vo=1.25V*(1+R2/R1)+Iadj*R2
C1 is required when regulator is located
an appreciated distance from power
supply. Co is needed to improve
transient response.
3
I
adj
Contek
ll
1
R1
R2
2
LM317
1
V
adj
R2
240 W
720W
D1 1N4002
Contek
LM317
1
120W
23
VoVi
1 mF
1kW
Co
1 mF
Vo
23
TTL Level
signal
On-off
)+Iadj=
R2
1.25V
R1
1.25V
R1+R2
control
Io
Vo
D1
1N4001
50kW
10 mF
Fig.6 Regulator with
VoVi
Vi
3
Contek
R1
2
Lm317
1
I
adj
Vref
Iomax=(
Iomin=(
)+Iadj=
R1
Vref
R1+R2
5mA<Io<100mA
Fig.7 Soft start application Fig.8 Constant current application
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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