L7812 Positive Voltage Regulator
= Fixed 12V Linear Regulator for Stable Power Supply Circuits =
The L7812 is a three-terminal positive voltage regulator from the 78xx series. It provides a fixed, stable +12V output from a higher, unregulated DC input voltage . This makes it a key component for powering circuits that require a clean and reliable 12V supply.
Fixed 12V Output - Provides a stable 12V DC output for consistent circuit operation.
Indestructible Design Builtin protection against overheating and short circuits ensures durability .
Typical Input Voltage Range: 14V to 27V DC (Minimum around 14.5V-19V) .
Maximum Output Current: 1.5A (with adequate heatsinking) .
The L7812 is a linear regulator, meaning the difference between input and output voltage is dissipated as heat. A heatsink is highly recommended for currents over 1A .
= Technical Specifications =
| Parameter | Value |
|---|
| Output Voltage | 12V Fixed (±2% for 'A' version) |
| Input Voltage (Typical) | 14.5V to 27V DC |
| Input Voltage (Max) | 35V DC |
| Output Current | Up to 1.5A |
| Package | TO-220, D2PAK, etc. |
| Protection | Thermal Shutdown, Short Circuit Protection |
= Pin Configuration (TO-220 Package) =
When viewed from the front with the metal tab facing up and pins pointing down:
- Pin 1: Input (Unregulated DC voltage)
- Pin 2: Ground (Common)
- Pin 3: Output (Stabilized +12V)
Use a small heatsink to prevent the IC from overheating during operation .
For applications requiring high current, consider using a switching regulator to reduce heat generation.
Ensure the input voltage does not exceed 35V to prevent permanent damage .
= Troubleshooting =
No or incorrect output voltage:
- Verify input voltage is at least 14.5V and not exceeding 35V.
- Check the load current does not exceed 1.5A.
- Inspect for adequate heatsinking to prevent thermal shutdown.
