LM138K DATASHEET PDF

In addition to excellent line and load regulation, with full overload protection, the LTA incorporates new current limiting circuitry allowing large transient load currents to be handled for short periods. Transient load currents of up to 12A can be supplied without limiting, eliminating the need for a large output capacitor. The LTA is an improved version of the popular LM with improved circuit design and advanced process techniques to provide superior performance and reliability. These specifications are applicable for power dissipations up to 50W. Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.

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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 LM family is supplied in a standard 3-lead transis- tor package. A unique feature of the LM 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 LM 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 LM is useful in a wide variety of other applica- tions.

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LM138K DATASHEET PDF

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 LM family is supplied in a standard 3-lead transis- tor package. A unique feature of the LM 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 LM 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.

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LM338T National Semiconductor, LM338T Datasheet

The category of second Level Interconnect is marked on the package and on the inner Normally, no capacitors are needed unless the. Current limit Figure 5. These packages have a lead-free second level interconnect. Prev Next Three-terminal 5 A adjustable voltage regulators. Vatasheet replacing fixed regulators or discrete.

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