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LM340SX-12 Datenblatt(PDF) 2 Page - Texas Instruments |
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LM340SX-12 Datenblatt(HTML) 2 Page - Texas Instruments |
2 / 19 page LM340/LM78XX Series 3-Terminal Positive Regulators General Description The LM140/LM340A/LM340/LM78XXC monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensa- tion, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over 1.0A output cur- rent. They are intended as fixed voltage regulators in a wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed volt- age regulators, these devices can be used with external components to obtain adjustable output voltages and cur- rents. Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of exter- nal components. It is not necessary to bypass the output, although this does improve transient response. Input by- passing 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/LM78XXC series is available in the TO-220 plastic power package, and the LM340-5.0 is available in the SOT-223 package, as well as the LM340-5.0 and LM340-12 in the surface-mount TO- 263 package. Features n Complete specifications at 1A load n Output voltage tolerances of ±2% at T j = 25˚C and ±4% over the temperature range (LM340A) n Line regulation of 0.01% of V OUT/V of ∆V IN at 1A load (LM340A) n Load regulation of 0.3% of V OUT/A (LM340A) n Internal thermal overload protection n Internal short-circuit current limit n Output transistor safe area protection n P + Product Enhancement tested Typical Applications Fixed Output Regulator Adjustable Output Regulator 00778101 *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). 00778102 VOUT = 5V + (5V/R1 + IQ) R2 5V/R1 > 3IQ, load regulation (Lr) ≈ [(R1 + R2)/R1] (Lr of LM340-5). Current Regulator Comparison between SOT-223 and D-Pak (TO-252) Packages 00778103 ∆IQ = 1.3 mA over line and load changes. 00778138 Scale 1:1 July 2006 © 2006 National Semiconductor Corporation DS007781 www.national.com |
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