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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM338T Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM338T Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  LM138/LM338 5-Amp Adjustable Regulators General Description The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5A over a 1.2V to 32V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. Careful circuit design has resulted in outstanding load and line regulation — comparable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transistor package. A unique feature of the LM138 family is time-dependent cur- rent limiting. The current limit circuitry allows peak currents of up to 12A to be drawn from the regulator for short periods of time. This allows the LM138 to be used with heavy tran- sient loads and speeds start-up under full-load conditions. Under sustained loading conditions, the current limit de- creases to a safe value protecting the regulator. Also in- cluded on the chip are thermal overload protection and safe area protection for the power transistor. Overload protection remains functional even if the adjustment pin is accidentally disconnected. Normally, no capacitors are needed unless the device is situ- ated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypass- ing the adjustment pin will increase the regulator’s ripple re- jection. Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Since the regulator is “floating” and sees 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, i.e., do not short-circuit output to ground. The part numbers in the LM138 series which have a K suffix are packaged in a standard Steel TO-3 package, while those with a T suffix are packaged in a TO-220 plastic package. The LM138 is rated for −55˚C ≤ T J ≤ +150˚C, and the LM338 is rated for 0˚C ≤ T J ≤ +125˚C. Features n Guaranteed 7A peak output current n Guaranteed 5A output current n Adjustable output down to 1.2V n Guaranteed thermal regulation n Current limit constant with temperature n P + Product Enhancement tested n Output is short-circuit protected Applications n Adjustable power supplies n Constant current regulators n Battery chargers Connection Diagrams (See Physical Dimension section for further information) (TO-3 STEEL) Metal Can Package DS009060-30 Bottom View Order Number LM138K STEEL or LM338K STEEL See NS Package Number K02A (TO-220) Plastic Package DS009060-31 Front View Order Number LM338T See NS Package Number T03B May 1998 © 1999 National Semiconductor Corporation DS009060 www.national.com |
Numéro de pièce similaire - LM338T |
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Description similaire - LM338T |
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