LM138K Allicdata Electronics
Allicdata Part #:

497-6706-ND

Manufacturer Part#:

LM138K

Price: $ 0.00
Product Category:

Integrated Circuits (ICs)

Manufacturer: STMicroelectronics
Short Description: IC REG LINEAR POS ADJ 5A TO3
More Detail: Linear Voltage Regulator IC Positive Adjustable 1 ...
DataSheet: LM138K datasheetLM138K Datasheet/PDF
Quantity: 1000
1 +: 0.00000
Stock 1000Can Ship Immediately
$ 0
Specifications
Series: --
Packaging: Tray 
Part Status: Obsolete
Output Configuration: Positive
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): 35V
Voltage - Output (Min/Fixed): 1.2V
Voltage - Output (Max): 32V
Voltage Dropout (Max): --
Current - Output: 5A
PSRR: 75dB ~ 60dB (120Hz)
Control Features: --
Protection Features: Over Current, Over Temperature
Operating Temperature: -55°C ~ 150°C
Mounting Type: Through Hole
Package / Case: TO-204AA, TO-3
Supplier Device Package: TO-3
Base Part Number: LM138
Description

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LM138K Application Field and Working Principle

The LM138K is a voltage regulator from Texas Instruments. This versatile device can be used for systems requiring adjustable and highly regulated negative supply voltages up to -20V. It offers improved power supply regulation against line and load changes, and has a lower noise output than standard three-terminal regulators.

Introduction to the LM138K

The LM138K is a wide supply range series consisting of three adjustable voltage regulators. The outputs can be set anywhere between -2V to -20V with just two resistors. It is available in a standard 8-pin package with an input voltage range of -10V to -37V. This device features internal current limiting and thermal shutdown protection which makes it an ideal choice for many applications. Additionally, the output voltage is trimmed by 0.5V at +25°C.

Features of the LM138K

The LM138K offers excellent supply regulation and low output noise over a wide range of line and load variations. This device also offers excellent temperature stability, with the trim point temperature shifting less than 0.1 mV/°C across the temperature range of 0°C to +125°C. The LM138K is also very easy to use, requiring just two resistors to set the output voltage. The device is available in the common 8-pin package and is soldered easily onto circuit boards.

Applications of the LM138K

The LM138K is suitable for a wide range of applications, including:
  • Negative power supply regulation
  • Battery-operated systems
  • Portable instrumentation
  • Personal Computer (PC) peripherals
  • Automotive and audio applications

Working Principle of the LM138K

The LM138K is a three-terminal adjustable voltage regulator. It uses a combination ofpass transistors, reference, error amplifiers and current limiter. The input voltage is compared to a reference voltage and the output voltage is adjusted by a series of feedback loops and control circuits to maintain the desired output voltage.The error amplifier compares the output voltage to the reference voltage and the current limit circuit senses output current supplied by the pass transistor. The reference voltage is set by a series resistor and the output voltage is adjusted using the two feedback resistors.

Conclusion

The LM138K is a versatile negative voltage regulator which can be used to meet the requirements of applications that require adjustable and highly regulated -20V output. The device offers improved power supply regulation against line and load changes and has a lower noise output than standard three-terminal regulators. The LM138K is ideal for battery-operated systems, portable instrumentation, PC peripherals, and automotive and audio applications.

The specific data is subject to PDF, and the above content is for reference

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