Overview
The LM7912CT/NOPB is a 1.5-A, negative linear voltage regulator produced by Texas Instruments. It is part of the LM79XX series, which includes fixed voltage regulators with output voltages of -5V, -12V, and -15V. The LM7912CT/NOPB specifically provides a fixed output voltage of -12V. This regulator is packaged in a TO-220 (NDE) package with 3 pins and is designed to offer high performance and protection features for various electronic applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | -11.5 to -12.5 | V |
| Input Voltage | -19 to -35 | V |
| Output Current | 1.5 | A |
| Line Regulation | 5 to 100 mV | |
| Load Regulation | 15 to 200 mV | |
| Quiescent Current | 1.5 to 3 | mA |
| Dropout Voltage | 1.1 | V |
| Peak Output Current | 2.2 | A |
| Operating Junction Temperature | 0 to 125 | °C |
| Storage Temperature | -65 to 150 | °C |
| Lead Temperature (Soldering, 10 sec.) | 230 | °C |
Key Features
- Thermal overload protection and internal short circuit protection to ensure safe operation under various conditions.
- High ripple rejection, providing stable output voltage despite input voltage fluctuations.
- Low ground pin current, allowing easy boosting of the output voltage above the preset value using a resistor divider.
- Internal current limiting and safe area protection to prevent damage from excessive power dissipation.
- Compact TO-220 package with 3 pins, suitable for a variety of applications.
- Low quiescent current, minimizing power consumption when the regulator is not under load.
- Good transient response and improved stability with the use of bypass capacitors.
Applications
The LM7912CT/NOPB is suitable for a wide range of applications requiring a stable negative voltage supply. These include:
- Power supplies and voltage regulators in electronic equipment.
- Audio and video equipment where stable voltage is crucial.
- Industrial control systems and automation.
- Medical devices requiring precise voltage regulation.
- Telecommunication equipment and networking devices.
Q & A
- What is the output voltage of the LM7912CT/NOPB?
The output voltage of the LM7912CT/NOPB is -12V. - What is the maximum output current of the LM7912CT/NOPB?
The maximum output current is 1.5A. - What type of package does the LM7912CT/NOPB come in?
The LM7912CT/NOPB comes in a TO-220 (NDE) package with 3 pins. - What are the key protection features of the LM7912CT/NOPB?
The key protection features include thermal overload protection, internal short circuit protection, and safe area protection. - What is the operating junction temperature range of the LM7912CT/NOPB?
The operating junction temperature range is 0°C to 125°C. - What is the quiescent current of the LM7912CT/NOPB?
The quiescent current is between 1.5 mA and 3 mA. - How does the LM7912CT/NOPB improve transient response?
The transient response is improved with the use of bypass capacitors on the input and output. - Can the output voltage of the LM7912CT/NOPB be boosted above the preset value?
Yes, the output voltage can be boosted using a resistor divider. - What is the dropout voltage of the LM7912CT/NOPB?
The dropout voltage is 1.1V. - What are some typical applications of the LM7912CT/NOPB?
Typical applications include power supplies, audio and video equipment, industrial control systems, medical devices, and telecommunication equipment.
