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LM317T Scheda tecnica(PDF) 1 Page - Texas Instruments |
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LM317T Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 48 page ( ) OUT ADJ R V = 1.25 V I R R 2 2 1 1 æ ö + + ç ÷ è ø LM317-N Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM117, LM317-N SNVS774P – MAY 2004 – REVISED OCTOBER 2015 LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator 1 Features 3 Description The LM117 and LM317-N series of adjustable 3-pin 1 • Typ. 0.1% Load Regulation positive voltage regulators are capable of supplying in • Typ. 0.01%/V Line Regulation excess of 1.5 A over a 1.25-V to 37-V output range • 1.5-A Output Current and a wide temperature range. They are exceptionally easy to use and require only two • Adjustable Output Down to 1.25 V external resistors to set the output voltage. Further, • Current Limit Constant With Temperature both line and load regulation are better than standard • 80-dB Ripple Rejection fixed regulators. • Short-Circuit Protected Output The LM117 and LM317-N offer full overload • −55°C to 150°C Operating Temperature Range protection such as current limit, thermal overload (LM117) protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. 2 Applications • Automotive LED Lighting Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter • Battery Chargers capacitors, in which case an input bypass is needed. • Post Regulation for Switching Supplies An optional output capacitor can be added to improve • Constant Current Regulators transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios • Microprocessor Supplies that are difficult to achieve with standard 3-terminal regulators. Typical Application Because the regulator is floating and detects 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. That is, avoid short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N can be also 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 1.25 V where most loads draw little current. For applications requiring greater output current, see data sheets for LM150 series (3 A), SNVS772, and LM138 series (5 A), SNVS771. For the negative complement, see LM137 (SNVS778) series data *Needed if device is more than 6 inches from filter sheet. capacitors. †Optional—improves transient response Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) TO-3 (2) 38.94 mm x 25.40 mm †† LM117 TO (3) 8.255 mm × 8.255 mm TO-3 (2) 38.94 mm x 25.40 mm TO-220 (3) 14.986 mm × 10.16 mm TO-263 (3) 10.18 mm × 8.41 mm LM317-N SOT-223 (4) 6.50 mm × 3.50 mm TO (3) 8.255 mm × 8.255 mm TO-252 (3) 6.58 mm × 6.10 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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