IL317
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
TO-220 AB
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
Pin 1. Ajust
(Heatsink
surface connected
to Pin 2.)
2. Vout
them essentially blow-out proof.
3. Vin
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.
Standard application
Vout
Vin
• 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
IL317
R1
*
**
Ñin
Ño
Adjust
R2
0.1 F
1 F
µ
µ
• Output Transistor Safe-Area Compensation
• Floating Operation for High Voltage Applications
• Standard 3-lead Transistor Packages
• Eliminates Stocking Many Fixed
= Cin is required if regulator is located an ap-
∗
preciable distance from power supply filter.
= Co is not needed for stability ; however, is
∗∗
does improve transient response.
R2
R1
Vout =1.25V(1+
)+ ADJ ∗R2
I
Since I ADJ is controlled to less then 100 A, the
µ
error associated with this term is negligible in most
applications.
Maximum ratings
Rating
Symbol
Value
Unit
Input - Output Voltage Differential
Vi - Vo
40
Vdc
Power Dissipation and Thermal Characteristics
Operating Junction Temperature Rang
Storage Junction Temperature Rang
PD
TJ
Tstg
Internally Limited
-0 to +150
°C
°C
-65 to +150
1
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