Description
The LM117 and LM317-N series of adjustable 3-pinpositive voltage regulators are capable of supplying inexcess of 1.5 A over a 1.25-V to 37-V output rangeand a wide temperature range. They areexceptionally easy to use and require only twoexternal resistors to set the output voltage. Further,both line and load regulation are better than standardfixed regulators.
The LM117 and LM317-N offer full overloadprotection such as current limit, thermal overloadprotection and safe area protection. All overloadprotection circuitry remains fully functional even if theadjustment terminal is disconnected.
Typically, no capacitors are needed unless the deviceis situated more than 6 inches from the input filtercapacitors, in which case an input bypass is needed.An optional output capacitor can be added to improvetransient response. The adjustment terminal can bebypassed to achieve very high ripple rejection ratiosthat are difficult to achieve with standard 3-terminalregulators.
Because the regulator is floating and detects only theinput-to-output differential voltage, supplies of severalhundred volts can be regulated as long as themaximum input-to-output differential is not exceeded.That is, avoid short-circuiting the output.
By connecting a fixed resistor between theadjustment pin and output, the LM117 and LM317-Ncan be also used as a precision current regulator.Supplies with electronic shutdown can be achievedby clamping the adjustment terminal to ground, whichprograms the output to 1.25 V where most loads drawlittle current.
For applications requiring greater output current, seethe LM150 series (3 A) and LM138 series (5 A) datasheets. For the negative complement, see the LM137series data sheet.
Features
• For a newer drop-in alternative, see the LM317
• Typ. 0.1% load regulation
• Typ. 0.01%/V line regulation
• 1.5-A output current
• Adjustable output down to 1.25 V
• Current limit constant with temperature
• 80-dB ripple rejection
• Short-circuit protected output
• −55°C to 150°C operating temperature range(LM117)
Applications
• Multifunction printers
• AC drive power stage modules
• Electricity meters
• Servo drive control modules
• Merchant network and server PSU
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