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LM337K-STEEL 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM337K-STEEL 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 12 page LM137/LM337 3-Terminal Adjustable Negative Regulators General Description The LM137/LM337 are adjustable 3-terminal negative volt- age regulators capable of supplying in excess of −1.5A over an output voltage range of −1.2V to −37V. These regulators are exceptionally easy to apply, requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency compensation. The circuit design has been opti- mized for excellent regulation and low thermal transients. Further, the LM137 series features internal current limiting, thermal shutdown and safe-area compensation, making them virtually blowout-proof against overloads. The LM137/LM337 serve a wide variety of applications in- cluding local on-card regulation, programmable-output volt- age regulation or precision current regulation. The LM137/ LM337 are ideal complements to the LM117/LM317 adjustable positive regulators. Features n Output voltage adjustable from −1.2V to −37V n 1.5A output current guaranteed, −55˚C to +150˚C n Line regulation typically 0.01%/V n Load regulation typically 0.3% n Excellent thermal regulation, 0.002%/W n 77 dB ripple rejection n Excellent rejection of thermal transients n 50 ppm/˚C temperature coefficient n Temperature-independent current limit n Internal thermal overload protection n P + Product Enhancement tested n Standard 3-lead transistor package n Output is short circuit protected LM137 Series Packages and Power Capability Rated Design Device Package Power Load Dissipation Current LM137/337 TO-3 (K) 20W 1.5A TO-39 (H) 2W 0.5A LM337 TO-220 (T) 15W 1.5A LM337 SOT-223 (MP) 2W 1A Typical Applications Adjustable Negative Voltage Regulator 00906701 Full output current not available at high input-output voltages †C1=1µF solid tantalum or 10 µF aluminum electrolytic required for stability *C2=1µF solid tantalum is required only if regulator is more than 4" from power-supply filter capacitor Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients Comparison between SOT-223 and D-Pak (TO-252) Packages 00906731 Scale 1:1 November 2004 © 2004 National Semiconductor Corporation DS009067 www.national.com |
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