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LM338 датащи(PDF) 2 Page - Texas Instruments |
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LM338 датащи(HTML) 2 Page - Texas Instruments |
2 / 20 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 current limiting. The current limit circuitry allows peak cur- rents of up to 12A to be drawn from the regulator for short periods of time. This allows the LM138 to be used with heavy transient loads and speeds start-up under full-load condi- tions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Overload pro- tection remains functional even if the adjustment pin is acci- dentally disconnected. Normally, no capacitors are needed unless the device is situated 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 rejection. 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 Di- mension section for further information) Connection Diagrams (TO-3 STEEL) Metal Can Package (TO-220) Plastic Package 00906030 Bottom View Order Number LM138K STEEL or LM338K STEEL See NS Package Number K02A 00906031 Front View Order Number LM338T See NS Package Number T03B May 1998 © 2004 National Semiconductor Corporation DS009060 www.national.com |
Аналогичный номер детали - LM338 |
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Аналогичное описание - LM338 |
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