TS317L
3-Terminal Adjustable Output Positive Voltage Regulator
Pin assignment:
1. Input
2. Output
3. Output
4. Adjust
5. N/C
6. Output
7. Output
8. N/C
Pin assignment:
1. Adjustable
2. Output
3. Input
Output Voltage Range From
1.25V to 37V
Output Current up to 100mA
General Description
The TS317L is adjustable 3-terminal positive voltage regulator capable of supplying in excess of 100mA over an output
voltage range of 1.25 V to 37 V. This voltage regulator is exceptionally easy to use and require only two external resistors
to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation,
making it essentially blow-out proof.
Besides replacing fixed regulators, the TS317L is useful in a wide variety of other applications. Since the regulator is
鈥渇loating 鈥?and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long
as the maximum input-to-output differential is not exceeded.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a
fixed resistor between the adjustment and output, the TS317L can be used as a precision current regulator. Supplyies
with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to
1.25V where most loads draw little current.
The TS317L is offered in 3-pin TO-92 and SOP-8 package.
Features
Output current up to 100mA
Output Adjustable between 1.25 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
Eliminates Stocking Many Fixed Voltages
Output voltage offered in 4% tolerance
Standard Application
Vout = 1.25 V * (1 + R2 / R1 ) + Iadj
j
* R2
Since I
Adj
is controlled to less than 100
碌A,
the error
associated with this term is negligible in most applications
A common ground is required between the input and the
output voltages. The input voltage must remain typically
2.0V above the output voltage even during the low point
on the Input ripple voltage.
* = Cin is required if regulator is located an appreciable
distance from power supply filter.
** = Co is not needed for stability; however, it does
improve transient response.
Ordering Information
Part No.
TS317LCS
TS317LCT
Operating Temp.
o
-20 ~ +125 C
Package
SOP-8
TO-92
TS317L
1-6
2003/12 rev. A
1
2
3
4
5
6
