UTC LM317
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R101-009,B
3-TERMINAL 1A POSITIVE
ADJUSTABLE VOLTAGE
REGULATOR
DESCRIPTION
The UTC LM317 is an adjustable 3-terminal positive
voltage regulator, designed to supply more than 1.5A of
output current with voltage adjustable from 1.3 to 37V.
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.
TO-220
1
TO-263
1
TO-252
1
1:ADJ 2:Output 3:Input
BLOCK DIAGRAM
VREF
INPUT
VAdj
PROTECTION
CIRCUIT
OUTPUT
UTC LM317
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R101-009,B
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
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
VO
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
VO
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
A
Adjustable Pin Current
Change
IADJ
2.5V<=VI-VO<=40V,
10mA<=Io<=IMAX, PD<=PMAX
2.0
5
A
Reference Voltage
VREF
3V<=VI-VO<=40V,
10mA<=IO<=IMAX,PD<=PMAX
1.20
1.25
1.30
V
Temperature Stability
STT
0.7
%/VO
Minimum Load Current
for Regulation
IL(MIN)
VI-VO=40V
3.5
10
mA
Maximum Output
Current
IO(MAX)
VI-VO<=15V, PD<=PMAX
1.5
2.2
A
VI-VO<=15V, PD<=PMAX,Ta=25
C
0.15
0.4
RMS Noise v.s.
%of Vout
eN
TA=25
C,10HZ<=f<=10KHZ
0.003
0.01
%/VO
Ripple Rejection
RR
VO=10V,f=120HZ,
60
dB
VO=10V,f=120HZ,CADJ=10
F
66
75
Long-term Stability,
TJ=THIGH
ST
TA=25
C,1000 hr
0.3
1
%
Junction to Case
Thermal Resistance
R
JC
5
C/W
Note: Testing with low duty pulse should be used to avoid heating effect.
UTC LM317
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R101-009,B
TYPICAL PERFORMANCE CHARACTERISTICS
0
25
50
75
100
125
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
Temperature
Output Voltage Deviation
Fig.1. Load Regulation vs
temperature
Vi=15V
Vo=10V
-50
-25
0
25
50
75
100
125
35
40
45
50
55
60
Fig.2 Adjustment Current vs Temperature
Adjustment Current
Temperature
0
25
50
75
100
125
1.0
1.5
2.0
2.5
3.0
Fig.3. Dropout Voltage vs Input-
Output Voltage Difference
Temperature
Input-Output Voltage
Difference
Vo=100mV
I
L
=1A
I
L
=500mA
I
L
=200mA
I
L
=20mA
I
L
=1.5A
-50
-25
0
25
50
75
100
125
1.235
1.240
1.245
1.250
1.255
1.260
Fig.4 Reference Voltage vs Temperature
Reference Voltage
Temperature
UTC LM317
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R101-009,B
APPLICATION CIRCUIT
1
2
3
Vo
R1
R2
Vi
C1
0.1
F
Co
1
F
I
adj
1
2
3
Vo
Vi
D1 1N4002
720
120
1k
1
F
TTL Level
signal
UTC
LM317
ll
Fig.5 Programmable voltage regulator Fig.6 Regulator with On-off control
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.
UTC LM317
1
2
3
UTC LM317
1
2
3
Vo
Vi
V
adj
R2
240
50k
D1
1N4001
10
F
Io
I
adj
R1
R2
Vo
Vi
Iomax=(
Vref
R1
)+Iadj=
1.25V
R1
Iomin=(
Vref
R1+R2
)+Iadj=
1.25V
R1+R2
5mA<Io<100mA
Fig.7 Soft start application Fig.8 Constant current application
PDF 
ZIP