IL317
1
THREE-TERMINAL ADJUSTABLE
OUTPUT POSITIVE VOLTAGE REGULATORS
The IL317 is 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. These voltage
regulator is exceptionally easy to use and require only two
external resistors to set the output voltage. Further, it
employ internal current limiting, thermal shutdown and safe
area compensation, making
them essentially blow-out proof.
The IL317 serve a wide variety of applications to
make a programmable output regulator, or by connecting a
fixed resistor between the adjustment and output, the IL317 series can be used as a precision current
requlator.
Output Current in Excess of 1.5 Ampere
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
Standard 3-lead Transistor Packages
Eliminates Stocking Many Fixed
Maximum ratings
Rating Symbol
Value
Unit
Input - Output Voltage Differential
Vi - Vo
40
Vdc
Power Dissipation and Thermal Characteristics
PD
Internally Limited
Operating Junction Temperature Rang
TJ
-0 to +150
C
Storage Junction Temperature Rang
Tstg
-65 to +150
C
Pin 1. Ajust
2. Vout
3. Vin
(H eatsink
surface connected
to Pin 2.)
TO-220 AB
R1
o
**
1F
Adjust
R2
in
*
0.1F
Vout
Vin
I L317
= C
in
is required if regulator is located an ap-
preciable distance from power supply filter.
= C
o
is
not needed for stability ; however, is
does improve transient response.
Vout
V
R
R
R
ADJ
I
=
+
+
125 1
2
1
2
.
(
)
Since I
AD J
is controlled to less then 100 A, the
error associated with this term is negligible in most
applications.
Standard application
IL317
2
Electrical characteristics
(Vi-Vo= 5.0V, Io = 0.5 A, TJ = Tlow to Thigh (see Note 1); Imax = 1.5 A and Pmax = 20 W unless otherwise
noted)
Characteristic
Symbol
Min Typ Max Unit
Line Regulation (TA=+25
C)
3.0V
Vi - Vo 40 V
Regline - 0.01 0.04
%/V
Load Regulation(TJ=+25
C)
10mA
IoImax,
Vin
5V
Vin
5 V
Regload
-
-
5.0
0.1
25
0.5
mV
%/Vo
Thermal Regulation (TA=+25
C)
20 ms Pulse
- -
0.03
0.07
%/W
Adjustment Pin Current
IAdj
-
50
100
A
Adjustment Pin Current Change
2.5
Vi - Vo 40 V
10mA
IL Imax, PD Pmax
IAdj
- 0.2 5.0
A
Reference Voltage (Note 4)
3.0
Vi - Vo 40 V
10mA
IL Imax, PD Pmax
Vref 1.2 1.25 1.3 V
Line Regulation (Note 3)
3.0 V
Vi - Vo 40 V
Regline - 0.02 0.07
%/V
Load Regulation (Note 3)
10mA
IoImax,
Vin
5V
Vin
5 V
Regload
-
-
20
0.3
70
1.5
%/V
%/V
Temperature Stability (Tlow
Tj
Ttigh)
Ts - 0.7 -
Minimum Load Current to
Maintain Regulation (Vi - Vo = 40 V)
ILmin - 3.5 10 mA
Maximum Output Current
Vi - Vo
15 V , P 20 W
Vi - Vo = 40 V, P
20W, TA=+25C
Imax
1.5
0.15
2.2
0.4
-
-
A
RMS Nose , % of Vo
TA=+25
C, 10 Hz f 10 kHz
N - 0.003 -
%/Vo
Ripple Rejection, Vo = 10 V, f = 120 Hz
(Note 5)
Without Cadj
Cadj = 10
F
RR
-
66
65
80
-
-
dB
Long-Term Stability, Tj = Thigh (Note 6)
TA=+25
C for Endpoint Measurements
S - 0.3
1.0
%/1.0 k
Hrs.
Thermal Resistance Junction to Case
R
JC
- 5.0 -
C/W
Notes: (1) Tlow = 0
C , Thigh = +125 C
(2) Imax = 0.5 A , Pmax
(3) Load and line regulation are specified at constant junction tempereture. Changes in Vo due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used.
(4) Selected devices with tightened tolerance reference voltage available.
(5) Cadj , when used, connected between the adjustment pin and ground.
(6) Since Long - Term Stability cannot be measured on each device before shipment, this specification is an
engineering estimate of average stability from lot to lot.
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