Overview
The LM317AEMPX is a 3-terminal adjustable positive-voltage regulator produced by National Semiconductor, now part of Texas Instruments. This device is capable of supplying current in excess of 1.5 A over an output range of 1.25 V to 37 V, with a high output-voltage accuracy of 1%.
The LM317AEMPX offers robust protection features, including overcurrent, thermal-overload, and safe-area protection, ensuring reliable operation even under adverse conditions. It is designed to provide better line and load regulation compared to standard fixed regulators, making it a versatile component for various power supply applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Output Voltage Range | 1.25 | - | 37 | V |
| Output Current | - | - | 1.5 | A |
| Input Voltage Range | 4.25 | - | 40 | V |
| Line Regulation | 0.005 | 0.01 | 0.01 | %/V |
| Load Regulation | 0.1 | 0.5 | 1.5 | % |
| Operating Temperature Range | -40 | - | 125 | °C |
| Junction-to-Ambient Thermal Resistance (TO-220) | - | - | 23.3 | °C/W |
| PSRR (120 Hz) | - | - | 80 | dB |
Key Features
- Adjustable Output Voltage: The LM317AEMPX allows for an adjustable output voltage from 1.25 V to 37 V, making it highly versatile for various applications.
- High Accuracy: Provides 1% output-voltage accuracy, ensuring reliable and precise voltage regulation.
- Overload Protection: Features overcurrent, thermal-overload, and safe-area protection, ensuring the device remains functional even under adverse conditions.
- Low Dropout Voltage: The device can operate with a low dropout voltage, enhancing efficiency in power supply designs.
- Optional Capacitors: Typically, no capacitors are needed unless the device is more than 6 inches from the input filter capacitors. An optional output capacitor can improve transient response.
Applications
- Power Supplies: The LM317AEMPX is widely used in adjustable power supply circuits due to its high accuracy and adjustable output voltage range.
- Voltage Regulation: Suitable for applications requiring precise voltage regulation, such as in electronic test equipment, medical devices, and industrial control systems.
- Battery Chargers: Can be used in battery charging circuits where adjustable voltage is necessary.
- Audio Equipment: Used in audio equipment for stable voltage supply to sensitive components.
Q & A
- What is the output voltage range of the LM317AEMPX?
The output voltage range of the LM317AEMPX is from 1.25 V to 37 V.
- What is the maximum output current of the LM317AEMPX?
The maximum output current of the LM317AEMPX is 1.5 A.
- What are the key protection features of the LM317AEMPX?
The LM317AEMPX features overcurrent, thermal-overload, and safe-area protection.
- What is the operating temperature range of the LM317AEMPX?
The operating temperature range of the LM317AEMPX is from -40°C to 125°C.
- Is an input bypass capacitor necessary for the LM317AEMPX?
Typically, no input bypass capacitor is needed unless the device is more than 6 inches from the input filter capacitors.
- Can the LM317AEMPX be used in battery charging circuits?
Yes, the LM317AEMPX can be used in battery charging circuits where adjustable voltage is necessary.
- What is the PSRR (Power Supply Rejection Ratio) of the LM317AEMPX at 120 Hz?
The PSRR of the LM317AEMPX at 120 Hz is 80 dB.
- How does the LM317AEMPX achieve high ripple-rejection ratios?
The LM317AEMPX can achieve high ripple-rejection ratios by bypassing the adjustment terminal.
- What are the typical applications of the LM317AEMPX?
The LM317AEMPX is typically used in power supplies, voltage regulation circuits, battery chargers, and audio equipment.
- What is the junction-to-ambient thermal resistance of the LM317AEMPX in a TO-220 package?
The junction-to-ambient thermal resistance of the LM317AEMPX in a TO-220 package is 23.3°C/W.
