Overview
The L78M24ABDT-TR is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78MxxA series. This regulator is designed to provide a fixed output voltage of 24V and is available in the TO-220FP package. It is suitable for a wide range of applications requiring local on-card regulation, eliminating the issues associated with single-point regulation. The device features internal current limiting, thermal shutdown, and safe area protection, making it highly reliable and robust.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 23.5 to 24.5 | V |
| Output Current | Up to 0.5 A | A |
| Input Voltage (for VO = 24V) | Up to 40 | V |
| Thermal Resistance Junction-Case (TO-220FP) | 5 | °C/W |
| Thermal Resistance Junction-Ambient (TO-220FP) | 50 | °C/W |
| Operating Junction Temperature Range | -40 to 125 | °C |
| Quiescent Current | 6 mA (typical) | mA |
| Dropout Voltage | 2 V (typical) | V |
| Short Circuit Current | 250 mA (typical) | mA |
| Short Circuit Peak Current | 700 mA (typical) | mA |
Key Features
- Fixed output voltage of 24V with ±2% tolerance
- Output current up to 0.5 A
- Internal current limiting and thermal shutdown
- Output transistor safe-area compensation
- Thermal overload protection
- Short circuit protection
- Low dropout voltage of 2V
- High supply voltage rejection (SVR) of 55 dB
- Low output noise voltage
Applications
The L78M24ABDT-TR is versatile and can be used in various applications, including:
- Local on-card regulation in electronic devices
- Power supplies for industrial and consumer electronics
- Automotive systems requiring robust voltage regulation
- Medical devices needing stable voltage supply
- Telecommunication equipment
Q & A
- What is the output voltage of the L78M24ABDT-TR? The output voltage is 24V with a ±2% tolerance.
- What is the maximum output current of the L78M24ABDT-TR? The maximum output current is up to 0.5 A.
- What type of protection does the L78M24ABDT-TR have? It has internal current limiting, thermal shutdown, and short circuit protection.
- What is the typical dropout voltage of the L78M24ABDT-TR? The typical dropout voltage is 2V.
- What is the operating junction temperature range of the L78M24ABDT-TR? The operating junction temperature range is -40 to 125°C.
- What is the quiescent current of the L78M24ABDT-TR? The typical quiescent current is 6 mA.
- Can the L78M24ABDT-TR be used in automotive systems? Yes, it can be used in automotive systems due to its robust voltage regulation and thermal protection features.
- What is the thermal resistance junction-case for the TO-220FP package? The thermal resistance junction-case for the TO-220FP package is 5°C/W.
- Does the L78M24ABDT-TR require external capacitors for operation? In many low current applications, compensation capacitors are not required, but it is recommended to bypass the regulator input with a capacitor if the regulator is connected to the power supply filter with long wire lengths.
- What is the supply voltage rejection (SVR) of the L78M24ABDT-TR? The supply voltage rejection (SVR) is 55 dB.
