L78L05CD

The L78L05CD is a three-terminal positive voltage regulator integrated circuit created by ST Microelectronics. It operates in combination with external components to maintain a fixed output voltage for a wide variety of applications. The device is able to deliver up to 100 mA of continuous current and is designed to offer low noise, high stability and excellent line and load regulation. It is available in a 5-pin TO-226 package.

Applications

The L78L05CD is ideal for applications that need a fixed output voltage from +5V to +20V. Typical applications include power supply for electronic equipment, battery-powered devices, backlighting, LED lighting, and microcontrollers. It can also be used in cellular phones, laptops and tablet computers.

Features

• Output Voltage: +5V to +20V
• Output Current: 100 mA
• Maximum Output Voltage Error: 1.5%
• Ripple Rejection: 80 dB minimum
• Input Voltage Range: 10V to 30V
• Line Regulation: 0.3% maximum
• Load Regulation: 0.5% maximum
• Package: 5 Pin TO-226

Working Principle

The L78L05CD is a three-terminal positive voltage regulator and it works by receiving input voltage of 10V to 30V and contains an internal amplifier, resistors and zener diodes. Upon receiving the input voltage, the internal amplifier will compare it to the reference voltage and regulate the output voltage according to the difference between the input and the reference voltage. It constantly monitors the output voltage to ensure that it does not exceed the maximum output voltage. If the output voltage does exceed the maximum output voltage, the regulator will reduce the output voltage in order to maintain the desired output voltage.

Conclusion

The L78L05CD is a three-terminal positive voltage regulator that is ideal for powering devices that require a fixed output voltage from +5V to +20V. It is designed to offer low noise, high stability and excellent line and load regulation. It can deliver up to 100 mA of continuous current and comes in a 5-pin TO-226 package.