L6740L

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PMICs fall into two general categories - power supply controllers and monitors. In this article, we will focus on the L6740L, a power supply controller within the family of PMICs. Described will be the application field and the working principle of a L6740L.

The application field of the L6740L is typically in the field of industrial instrumentation. Its primary purpose is to provide a reliable and efficient power supply. This is accomplished by regulating the current and voltage while also preventing the possibility of any sudden load fluctuations. The power range of a L6740L is quite wide, allowing it to be used in many different applications and offer great flexibility. The output can be adjusted as little as 25mV increments, giving great control over power delivery.

The L6740L works using two stages. The first stage is the buck converter, which is used in the process of converting DC to AC; the second stage is a linear regulation stage. The first stage consists of an input capacitor, a transformer, and a switching transistor to step the voltage down. This stage is primarily used to control the voltage and current. The second stage is used to ensure the output is as close to required tolerance as possible. In order to accomplish this, the second stage does most of its work using an internal voltage reference as shown in the diagram below.

The linear regulator stage combines a voltage reference and a differential amplifier. It ensures that the output of the buck converter stays close to the pre-defined voltage. This is accomplished by comparing the output voltage of the buck converter with the voltage reference. If the output voltage of the buck converter is less than the voltage reference, then the amplifier will output a high signal to the switch, which will then increase the switch time period. Conversely, if the output voltage of the buck converter is greater than the voltage reference, then the amplifier will output a low signal to the switch, which will then decrease the switch time period. This ensures that the output of the buck converter is always within the required tolerance.

The L6740L is a reliable and efficient power supply which finds application in industrial instrumentation. It works by combining a buck converter and linear regulation stage to consistently and accurately deliver power. This combination of stages ensures that the output of the power supply remains within tolerance and also provides great flexibility for a variety of applications. Together, the working principle and application field make the L6740L an ideal candidate for industrial power supply system needs.

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