Overview
The LM338T/NOPB is a 5-Amp adjustable linear voltage regulator produced by Texas Instruments. This device is part of the LM338 series and is known for its high current capability and adjustable output voltage. The LM338T/NOPB is packaged in a TO-220 package, making it suitable for a variety of applications requiring reliable voltage regulation.
The regulator features a nominal 1.25-V reference voltage between the output and adjustment terminals, allowing for easy adjustment of the output voltage using external resistors. It also includes several protection features such as current limiting, thermal overload protection, and safe operating area protection, ensuring robust operation under various conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Output Current | 5 | A |
| Output Voltage Range | 1.2 to 32 | V |
| Input-to-Output Voltage Differential | 3 to 40 | V |
| Operating Temperature Range | 0 to 125 | °C |
| Storage Temperature Range | –65 to 150 | °C |
| Junction-to-Ambient Thermal Resistance (TO-220) | 22.9 | °C/W |
| Reference Voltage | 1.19 to 1.29 | V |
| Line Regulation | 0.005% to 0.01% | |
| Load Regulation | 0.1% |
Key Features
- Adjustable Output Voltage: The output voltage can be adjusted from 1.2 V to 32 V using external resistors.
- High Current Capability: The regulator can supply up to 5 A of output current.
- Thermal Overload Protection: The device includes thermal overload protection to prevent damage from excessive heat.
- Current Limiting: The regulator features current limiting to protect against overcurrent conditions.
- Safe Operating Area Protection: Protection against safe operating area ensures the device operates within safe limits.
- Low Output Impedance: The NPN Darlington output topology provides naturally low output impedance.
- Optional Output Capacitor: An optional output capacitor can be added to improve transient response.
- High Ripple Rejection: Bypassing the adjustment pin can achieve high ripple rejection ratios.
Applications
The LM338T/NOPB is versatile and can be used in a variety of applications, including:
- Programmable Output Regulation: The device can be used to create programmable output voltage regulators.
- Local On-Card Regulation: It is suitable for local voltage regulation on circuit boards.
- Precision Current Regulation: By connecting a fixed resistor between the ADJUST and OUTPUT terminals, the device can function as a precision current regulator.
- High-Voltage Supplies: The regulator can handle input-to-output differentials of up to 40 V, making it suitable for high-voltage supply applications.
Q & A
- What is the maximum output current of the LM338T/NOPB?
The maximum output current is 5 A.
- What is the adjustable output voltage range of the LM338T/NOPB?
The output voltage can be adjusted from 1.2 V to 32 V.
- What type of package does the LM338T/NOPB come in?
The device is packaged in a TO-220 package.
- What are the operating temperature ranges for the LM338T/NOPB?
The operating temperature range is from 0°C to 125°C.
- Does the LM338T/NOPB have thermal overload protection?
Yes, the device includes thermal overload protection.
- How can the output voltage be adjusted on the LM338T/NOPB?
The output voltage can be adjusted using external resistors connected to the ADJUST terminal.
- What is the typical line regulation of the LM338T/NOPB?
The typical line regulation is 0.005%.
- Can the LM338T/NOPB be used for high-voltage applications?
Yes, it can handle input-to-output differentials of up to 40 V.
- What is the purpose of the optional output capacitor in the LM338T/NOPB?
The optional output capacitor can be added to improve transient response.
- How does the LM338T/NOPB protect against overcurrent conditions?
The device features current limiting to protect against overcurrent conditions.
