Overview
The L7924CV is a negative voltage regulator from STMicroelectronics, part of the L79 series. This three-terminal regulator is designed to provide a stable negative output voltage and is available in several package types, including TO-220, TO-220FP, and D²PAK. The L7924CV specifically offers a fixed output voltage of -24V, making it suitable for various applications requiring a stable negative voltage supply.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | -24 | V |
| Output Current | 500 mA | |
| Package Type | TO-220 | |
| Input Voltage Range | -35 V (max) | V |
| Power Dissipation | Internally limited | |
| Operating Junction Temperature Range | 0 to 150 °C | °C |
| Thermal Resistance Junction-Case | 5 °C/W | °C/W |
| Thermal Resistance Junction-Ambient | 50 °C/W | °C/W |
| Quiescent Current | 3 mA (typ) | mA |
| Dropout Voltage | 1.4 V (typ) | V |
| Short Circuit Current | 1.8 A (max) | A |
Key Features
- Fixed Output Voltage: The L7924CV provides a stable -24V output voltage, ideal for applications requiring a precise negative voltage supply.
- High Current Capability: The regulator can supply up to 500 mA of output current, making it suitable for a variety of power requirements.
- Thermal Protection: Internally limited power dissipation and thermal resistance ensure the device operates within safe temperature ranges.
- Low Dropout Voltage: A typical dropout voltage of 1.4V minimizes the voltage loss between the input and output, enhancing efficiency.
- Adjustable Voltage Option: Although primarily designed as a fixed voltage regulator, the L79 series can be used with external components to achieve adjustable voltages and currents.
Applications
- Power Supplies: The L7924CV is used in power supply circuits to provide a stable negative voltage output.
- Split Power Supplies: It can be part of a split power supply configuration, providing both positive and negative voltage rails.
- Audio Equipment: Suitable for use in audio equipment where a stable negative voltage is required for operational amplifiers and other components.
- Industrial Control Systems: Used in industrial control systems that require reliable and stable negative voltage supplies.
- Medical Devices: Can be used in medical devices that need precise and stable negative voltage supplies.
Q & A
- What is the output voltage of the L7924CV?
The output voltage of the L7924CV is -24V.
- What is the maximum output current of the L7924CV?
The maximum output current of the L7924CV is 500 mA.
- What package types are available for the L7924CV?
The L7924CV is available in TO-220, TO-220FP, and D²PAK packages.
- What is the maximum input voltage for the L7924CV?
The maximum input voltage for the L7924CV is -35V.
- What is the typical quiescent current of the L7924CV?
The typical quiescent current of the L7924CV is 3 mA.
- What is the dropout voltage of the L7924CV?
The typical dropout voltage of the L7924CV is 1.4V.
- Can the L7924CV be used for adjustable voltage regulation?
Yes, although primarily designed as a fixed voltage regulator, the L79 series can be used with external components to achieve adjustable voltages and currents.
- What are the thermal protection features of the L7924CV?
The L7924CV has internally limited power dissipation and specified thermal resistance to ensure safe operation within temperature ranges.
- What are common applications for the L7924CV?
Common applications include power supplies, split power supplies, audio equipment, industrial control systems, and medical devices.
- What capacitors are recommended for stability with the L7924CV?
For stability, a solid tantalum capacitor (CI) and an output capacitor (CO) are recommended. If aluminum electrolytic capacitors are used, at least ten times the value should be selected.
