Overview
The L78S18CV is a 2 A positive voltage regulator IC from STMicroelectronics, part of the L78S series. This component is available in the TO-220 package and is designed to provide stable and regulated output voltage. The L78S18CV is specifically configured to deliver an output voltage of 18 V, making it suitable for a wide range of applications requiring reliable voltage regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 17.1 - 18.9 | V |
| Output Current | Up to 2 A | A |
| Line Regulation | 360 mV (VI = 20.5 to 30 V) | mV |
| Load Regulation | 360 mV (IO = 20 mA to 1.5 A) | mV |
| Quiescent Current | 8 mA | mA |
| Output Noise Voltage | 110 µV (B = 10 Hz to 100 kHz) | µV |
| Supply Voltage Rejection | 43 dB (f = 120 Hz) | dB |
| Operating Input Voltage | 21 V (IO ≤ 1 A) | V |
| Output Resistance | 22 mΩ (f = 1 kHz) | mΩ |
| Short Circuit Current | 500 mA (VI = 27 V) | mA |
| Short Circuit Peak Current | 3 A | A |
| Thermal Resistance Junction-Case | 5 °C/W | °C/W |
| Thermal Resistance Junction-Ambient | 50 °C/W | °C/W |
Key Features
- Output current up to 2 A
- Output voltage of 18 V
- Thermal protection
- Short circuit protection
- Output transition SOA protection
- Internal current limiting and safe area protection
- Available in TO-220 package
- Can be used with external components to obtain adjustable voltages and currents
Applications
The L78S18CV is useful in a wide range of applications where local on-card regulation is necessary. It is particularly suitable for:
- Power supplies requiring stable and regulated output voltage
- Industrial control systems
- Consumer electronics
- Automotive systems
- Medical devices
Q & A
- What is the output voltage of the L78S18CV?
The output voltage of the L78S18CV is 18 V. - What is the maximum output current of the L78S18CV?
The maximum output current is up to 2 A. - What type of package is the L78S18CV available in?
The L78S18CV is available in the TO-220 package. - Does the L78S18CV have thermal protection?
Yes, the L78S18CV has thermal protection. - Can the L78S18CV be used for adjustable voltages?
Yes, it can be used with external components to obtain adjustable voltages and currents. - What is the quiescent current of the L78S18CV?
The quiescent current is 8 mA. - What is the short circuit current of the L78S18CV?
The short circuit current is 500 mA (VI = 27 V). - What is the thermal resistance junction-case of the L78S18CV?
The thermal resistance junction-case is 5 °C/W. - What is the operating input voltage for the L78S18CV when the output current is less than or equal to 1 A?
The operating input voltage is 21 V (IO ≤ 1 A). - What is the supply voltage rejection of the L78S18CV at 120 Hz?
The supply voltage rejection is 43 dB (f = 120 Hz).
