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LM338KSTEEL 데이터시트(PDF) 1 Page - Texas Instruments |
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LM338KSTEEL 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 23 page LM138, LM338 www.ti.com SNVS771B – MAY 1998 – REVISED APRIL 2013 LM138/LM338 5-Amp Adjustable Regulators Check for Samples: LM138, LM338 A unique feature of the LM138 family is time- 1 FEATURES dependent current limiting. The current limit circuitry 2 • Specified 7A Peak Output Current allows peak currents of up to 12A to be drawn from • Specified 5A Output Current the regulator for short periods of time. This allows the LM138 to be used with heavy transient loads and • Adjustable Output Down to 1.2V speeds start-up under full-load conditions. Under • Specified Thermal Regulation sustained loading conditions, the current limit • Current Limit Constant with Temperature decreases to a safe value protecting the regulator. Also included on the chip are thermal overload • P+ Product Enhancement Tested protection and safe area protection for the power • Output is Short-Circuit Protected transistor. Overload protection remains functional even if the adjustment pin is accidentally APPLICATIONS disconnected. • Adjustable Power Supplies Normally, no capacitors are needed unless the device • Constant Current Regulators is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. • Battery Chargers An output capacitor can be added to improve transient response, while bypassing the adjustment DESCRIPTION pin will increase the regulator's ripple rejection. The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess Besides replacing fixed regulators or discrete of 5A over a 1.2V to 32V output range. They are designs, the LM138 is useful in a wide variety of exceptionally easy to use and require only 2 resistors other applications. Since the regulator is “floating” to set the output voltage. Careful circuit design has and sees only the input-to-output differential voltage, resulted in outstanding load and line supplies of several hundred volts can be regulated as regulation—comparable to many commercial power long as the maximum input to output differential is not supplies. The LM138 family is supplied in a standard exceeded, i.e., do not short-circuit output to ground. 3-lead transistor package. 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 ≤ TJ ≤ +150°C, and the LM338 is rated for 0°C ≤ TJ ≤ +125°C. Connection Diagram Connection Diagrams Figure 1. (TO-3) Metal Can Package Figure 2. (TO-220) Plastic Package Bottom View Front View See Package Number NDS0002A See Package Number NDE0003B 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 © 1998–2013, 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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