ESTEK LM317

Description
The 3 1 7 are adjustable 3 - terminal positive -voltage regulators capable of supplying 1.5A over a differential voltage range of 3Vto
40V. They are exceptionally easy
to
use
and
require only two external resistors to set the output voltage.
Both input and output regulation are better than standard fixed regulators.In addition to higher performance than fixed regulators,
these regulators offer full overload protection available only in integrated circuits. Included on the chip are current limit,
thermal overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if
the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated far from
the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient
response.The primary applications of each of these regulators is that of a programmable output regulator, but by
connecting a fixed resistor between adjustment terminal and the output terminal, each device can be used as a
precision current regulator. Even though the regulator is floating and sees only the input-to-output differential voltage,
use of these devices to regulate output voltages that would cause the maximum-rated differential voltage to be exceeded if
the output became shorted to ground is not recommended.
Features
• Output Voltage Range Adjustable from 1.2 V to 37 V
• Output Current Capability of 1.5 A Max
• Input Regulation Typically 0.01 % Per Input - Volt Change
• Output Regulation Typically 0.1 %
• Peak Output Current Constant Over
Temperature
Range of Regulator
• Popular 3-Lead TO-220 Package
• Ripple Rejection Typically 80 dB
Typical application data
V
3
I
IN
317
ADJ
1
OUT
2
V
0
(see Note C)
R1
240 Ω
C1 = 0.1
µ
F
(see Note A)
C2 = 1
(see Note B)
R2
Note A: Use of an input bypass capacitor is recommended if regulator is far from filter capacitors.
Note B: Use of an output capacitor improves transient response but is optional.
Note C: Output voltage is calculated from the equation:
0
=

R 
V
Vref   1+
R1
Vref equals the difference between the output and adjustment terminal
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Absolute Maximum Ratings
OVER OPERATING TEMPERATURE RANGE (UNLESS OTHERWISE NOTED)
Parameter
Maximum
Units
Input-to-output differential voltage, VI - Vo
Continuous total dissipation at 25 °
C free-air temperature
Continuous total dissipation at (or below) 25 °
C case temperature
Operating free-air, case, or virtual junction temperature range
Storage temperature range
40
2
15
0 to 125
-65 to 150
V
W
W
°
C
°
C
Recommended Operating Conditions
Parameter
Output current, I0
Operating virtual junction temperature, T J
LM 317
min
10
0
Units
max
1500
125
mA
°
C
Electrical Characteristics
Electrical Characteristics over recommended ranges of operating virtual junction temperature (unless other wise noted) (Note 1)
Parameter
Test Conditions*
317
Min
Input regulation (Note 2)
Ripple rejection
VI-V0=3 V to 40 V,
(Note 3)
Units
Typ
Max
TJ = MIN to MAX
0.01
0.04
l0 = 10 mA to 1.5 A
0.02
0.07
Vo=10 V, f=120 Hz
65
Vo=10 V, f=120 Hz
10-µF capacitor between ADJ and ground
66
%/ V
dB
80
Vo ≤5 V
Vo > 5 V
Vo ≤ 5 V
Vo > 5 V
5
0.1
20
0.3
1
25
0.5
70
1.5
Output voltage change with temperature
lo = 10 mA to 1.5 A,
TJ= 25 °
C, (See Note 3)
lo = 10 mA to 1.5 A,
(Note 3)
TJ = MIN to MAX
mV
%
mV
%
%
Output voltage long-term drift (Note 4)
After 1000 h at TJ = MAX and VI-Vo =40 V
0.3
1
%
Output noise voltage
Minimum output current to maintain regulation
f= 10 Hz to 10 kHz, TJ =25°
C
VI-Vo = 40 V
0.003
3.5
10
%
mA
Peak output current
VI-Vo ≤ 15 V
VI-Vo ≤ 40 V, TJ =25°
C
Output regulation
1.5
0.15
Adjustment-terminal current
Change in adjustment-terminal current
Reference voltage (output to ADJ )
VI-Vo=2.5 V to 40 V,
lo = 10 mA to 1.5 A
VI-Vo = 3 V to 40 V, lo=10 mA to 1.5 A,
P ≤ 15W
1.2
2.2
0.4
50
A
100
µA
0.2
5.0
µA
1.25
1.3
V
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* Unless otherwise noted, these specifications apply for the following test conditions: VI - V0 = 5V and I0 = 0.5 A. For conditions shown
as MIN or MAX, use the appropriate value specified under recommended operating conditions.
Note 1: All characteristics are measured with a 0.1 - µF capacitor across the input and a 1 - µF capacitor across the output.
Note 2: Input regulation is expressed here as the percentage change in output voltage per 1 - V change at the input.
Note 3: Pulse testing techniques are used to maintain the junction temperature as close to the ambient tempe rature as possible.
Thermal effects must be taken into account separately.
Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a
guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.
Ordering Information
O RDERING NU MB ER
LM317
Address :
P ACK AGE
TO - 220
M AR KING
LM317
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84
Fax : 010-58895793
Http://www.estek.com.cn
Email:sales@estek.com.cn
REV No:01-060808
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