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Description
3-Terminal Adjustable Regulator
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General Description
The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range.They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also,the LM117 is packaged in standard transistor packages which are easily mounted and handled.
In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's.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 more than 6 inches 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 adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since 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, i.e., avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output,the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. For applications requiring greater output current, see LM150series (3A) and LM138 series (5A) data sheets. For thenegative complement, see LM137 series data sheet.
Features
● Guaranteed 1% output voltage tolerance (LM317A)
● Guaranteed max.0.01%/V line regulation (LM317A)
● Guaranteed max.0.3% load regulation (LM117)
● Guaranteed 1.5A output current
● Adjustable output down to 1.2V
● Current limit constant with temperature
● P+ Product Enhancement tested
● 80 dB ripple rejection
● Output is short-circuit protected
Preview of the first 3 pages of the data sheet
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241 buyer reviews from United Kingdom
Elif Cakmak
Length of registration:5 years
Very satisfied with
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0
Reply0
04/22/2018
David Thomas
Length of registration:7 years
The LM317AT/NOPB is a great integrated circuit for voltage regulation. It is easy to use and provides reliable performance. The adjustable output voltage range is wide and the current limit is adjustable. The thermal shutdown feature is also a great feature that helps protect the circuit from overheating. Overall, the LM317AT/NOPB is a great integrated circuit for voltage regulation.
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0
Reply0
03/17/2023
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LM317AT
LM317AT has several brands around the world that may have alternate names for LM317AT due to regional differences or acquisition. LM317AT may also be known as the following names:
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Unit Price:1.20865
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