Texas Instruments LM138K
The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5 A over a 1.2-V to 32-V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. The LM138 family is supplied in a standard 3-lead transistor package.| Part No. | LM138K |
|---|---|
| Datasheet | LM138K Download |
| Manufacturer |  Texas Instruments |
| Description | 5-Amp Adjustable Regulator |
| Buy | Stock & Price |
FEATURES
●1 Specified 7-A Peak Output Current● Specified 5-A Output Current
● Adjustable Output Down to 1.2 V
● Specified Thermal Regulation
● Current Limit Constant With Temperature
● P + Product Enhancement Tested
● Output is Short-Circuit Protected 2
APPLICATIONS
● Adjustable Power Supplies● Constant Current Regulators
● Battery Chargers Pin 1. Adjustment 2. Output 3. Input Tab/Case is Output Available Packages 3 1 TO-220 1 2 3 TO-3 Typical Application Circuit Copyright © 2016, Texas Instruments Incorporated 3
DESCRIPTION
Careful circuit design has resulted in outstanding load and line regulation, comparable to many commercial power supplies. A unique feature of the LM138 family is timedependent current limiting. The current limit circuitry allows peak currents of up to 12 A 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 sustained loading conditions, the current limit decreases to a safe value protecting the regulator.
