The TL317 is an adjustable three-terminal positive-voltage regulator capable of supplying
100 mA over an output-voltage range of 1.25 V
to 32 V. It is exceptionally easy to use and
requires only two external resistors to set the output voltage.
This regulator offers full overload protection available only in integrated circuits.
Included on the chip are current-limiting and thermal-overload protection. All overload-protection
circuitry remains fully functional, even when ADJUSTMENT is disconnected. Normally, no capacitors
are required unless the device is situated far from the input filter capacitors, in which case an
input bypass is required. An optional output capacitor can be added to improve transient response.
ADJUSTMENT can be bypassed to achieve very high ripple rejection.
In addition to replacing fixed regulators, the TL317 regulator is useful in a wide
variety of other applications. Because the regulator is floating 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. Its primary application is that of a programmable
output regulator, but by connecting a fixed resistor between ADJUSTMENT and OUTPUT, this device can
be used as a precision current regulator. Supplies with electronic shutdown can be achieved by
clamping ADJUSTMENT to ground, programming the output to 1.25 V, where most loads draw little
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