L4949EPTR-E Integrated Circuits (ICs)

Introduction

L4949EPTR-E is a linear voltage regulator from Texas Instruments, providing a complete mains power supply solution for general purpose requirements. It is designed for fixed voltage applications in a variety of products including computers, servers, power supplies, communication and multimedia designs. Its features include a 5V output voltage, a maximum input voltage 16V, and a maximum output current of 3A.

Application Fields

The L4949EPTR-E is suitable for a wide range of application fields. For example, it can be used in AC/DC adapters, laptop charger, copy machines, TVs and other appliances. It is mainly used to provide stabilized constant voltage rated output, based on input voltage which ranges from 16V peak to 140V RMS. It can generate 3A stable power output with fast transient response time and low output impedance.

The L4949EPTR-E is also useful in industrial equipment, digital cameras, and USB wall chargers, providing an efficient and insulated power supply solution. As it is designed for isolating unused output power to ground, it offers superior reliability and noise immunity.

Working Principle

The L4949EPTR-E operates with a power feedback loop for voltage regulation. To achieve constant output voltage, the L4949EPTR-E uses a voltage reference, an error amplifier, and a power switch. When the input is applied, the voltage reference sets the reference voltage and the error amplifier amplifies the voltage error between the reference voltage and the actual output voltage. The amplified output of the error amplifier is then sent to the power switch, which controls the conduction cycles of the power MOSFET. This cycle produces a voltage drop in the switch, which is then sensed by the feedback circuit and compared with the reference voltage. Finally, the power switch is turned ON and OFF in accordance with the comparison result to maintain the output voltage at a constant level.

Conclusion

The L4949EPTR-E is a linear voltage regulator from Texas Instruments suitable for a wide range of applications. It is mainly used for providing stabilized constant voltage rated output based on input voltage ranging from 16V peak to 140V RMS. The L4949EPTR-E operates with a power feedback loop for voltage regulation, which is achieved by a voltage reference, an error amplifier, and a power switch to maintain the output voltage at a constant level.