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LM138K データシート(PDF) 1 Page - STMicroelectronics |
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LM138K データシート(HTML) 1 Page - STMicroelectronics |
1 / 12 page LM138/238 LM338 March 1993 ADJUSTABLE VOLTAGE REGULATORS THREE-TERMINAL 5-A . GUARANTEED 7A PEAK OUTPUT CURRENT . GUARANTEED 5A OUTPUT CURRENT . ADJUSTABLE OUTPUT DOWN TO 1.2V . LINE REGULATION TYPICALLY 0.005% /V . LOAD REGULATION TYPICALLY 0.1% . GUARANTEED THERMAL REGULATION . CURRENT LIMIT CONSTANT WITH TEM- PERATURE . STANDARD 3-LEAD TRANSISTOR PACKAGE DESCRIPTION The LM138/LM238/LM338 are adjustable 3-terminal positive voltage regulators capable of supplying in ex- cess 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 re- sulted in outstanding load and line regulation com- parable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transis- tor package. A unique feature of the LM138 family is time-de- pendent current 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 transient loads and speeds start-up under full-load conditions. Under sus- tained 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 accidentally disconnected. Normally, no capacitors are needed unless the device is situated far from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient res- ponse. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are dif- ficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators ordiscrete designs, the LM238 is useful in a wide variety of other applica- tions. Since the regulator is ”floating” and sees only theinput-to-output differential voltage, supplies of sev- eral hundred volts can be regulated as long as the maximum input to input differential is not exceeded. The LM138/LM238/LM338 are packaged in standard steel TO-3 transistor packages. The LM138 is rated for operation from -55 oCto 150 oC, the LM238 from –25 °C to + 150°C and the LM338 from 0°Cto + 125 °C. TO3 K SUFFIX (Steel Can) ORDER CODE PART NUMBER TEMPERATURE RANGE PACKAGE K LM138 LM238 LM338 -55 oC to + 150 oC -25 oC to + 150 oC 0 oC to + 125 oC • • • EXAMPLE: LM138K PIN CONNECTION (bottom view) Case is output 1/12 |
同様の部品番号 - LM138K |
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同様の説明 - LM138K |
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