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LM140 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM140 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 28 page LM340-N, LM78xx www.ti.com SNOSBT0J – FEBRUARY 2000 – REVISED DECEMBER 2013 LM340-N/LM78XX Series 3-Terminal Positive Regulators Check for Samples: LM340-N, LM78xx 1 FEATURES DESCRIPTION The LM140/LM340A/LM340-N/LM78XXC monolithic 2 • Complete Specifications at 1A Load 3-terminal positive voltage regulators employ internal • Output Voltage Tolerances of ±2% at Tj = 25°C current-limiting, thermal shutdown and safe-area and ±4% Over the Temperature Range compensation, making them essentially indestructible. (LM340A) If adequate heat sinking is provided, they can deliver over 1.0A output current. They are intended as fixed • Line Regulation of 0.01% of VOUT/V of ΔVIN at voltage regulators in a wide range of applications 1A Load (LM340A) including local (on-card) regulation for elimination of • Load Regulation of 0.3% of VOUT/A (LM340A) noise and distribution problems associated with • Internal Thermal Overload Protection single-point regulation. In addition to use as fixed voltage regulators, these devices can be used with • Internal Short-circuit Current Limit external components to obtain adjustable output • Output Transistor Safe Area Protection voltages and currents. • P+ Product Enhancement Tested Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply. The 5V, 12V, and 15V regulator options are available in the steel TO-3 power package. The LM340A/LM340-N/LM78XXC series is available in the TO-220 plastic power package, and the LM340-N-5.0 is available in the SOT-223 package, as well as the LM340-5.0 and LM340-12 in the surface-mount DDPAK/TO-263 package. Typical Applications *Required if the regulator is located far from the power supply filter. **Although no output capacitor is needed for stability, it does help transient response. (If needed, use 0.1 μF, ceramic disc). VOUT = 5V + (5V/R1 + IQ) R2 5V/R1 > 3 IQ, load regulation (Lr) ≈ [(R1 + R2)/R1] (Lr of LM340-5). Figure 1. Fixed Output Regulator Figure 2. Adjustable Output Regulator 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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