A current monitor is an essential tool that helps in measuring and monitoring the flow of current in a circuit. An accurate and reliable current monitor circuit is necessary for a wide range of applications, from power supply management to motor control, battery charging, and more. In this article, we will delve into the UCC3926 IC, a popular chip that can be used to build a 20A current monitor circuit.
Circuit Diagram of 20A Current Monitor Circuit
The 20A Current Monitor Circuit can be designed using a few basic components. The circuit diagram of the this project is shown below.
More Circuit Layouts
of 20A Current Monitor Circuit
As shown in the circuit diagram, the UCC3926 IC is used to monitor the current flowing through the load. The load is connected in series and the voltage is fed into the sense amplifier of the UCC3926 IC. The sense amplifier produces an output voltage proportional to the current flowing through the load.
The output of the sense amplifier is fed into a precision voltage reference that converts the current into a voltage. The voltage is then compared to a reference voltage using a differential amplifier. The differential amplifier produces an output voltage proportional to the difference between the two voltages. The output voltage is then fed into an analog to digital converter (ADC) for further processing.
UCC3926 IC Features:
The UCC3926 IC is a high-side current sensing circuit that can handle up to 20A of current. It is designed to monitor the current in a variety of applications, including power supplies, motor control circuits, and battery charging systems. The UCC3926 IC features a low offset voltage of 40mV and a low quiescent current of 200µA, which makes it ideal for battery-powered applications.
The UCC3926 IC uses a high-saturation current sense amplifier to detect the current flowing through the load. The sense amplifier can detect a wide range of currents, from as low as a few milliamps to as high as 20A. The output of the sense amplifier is fed into a precision voltage reference that converts the current into a voltage. The voltage is then compared to a reference voltage using a differential amplifier. The differential amplifier produces an output voltage proportional to the difference between the two voltages.
The UCC3926 IC also has a built-in overvoltage protection circuit that protects the sense amplifier from damage due to voltage spikes. The overvoltage protection circuit triggers when the voltage across the sense amplifier exceeds a certain threshold. The UCC3926 IC also includes a watchdog timer that monitors the output of the differential amplifier. If the output voltage exceeds a certain threshold for a specified amount of time, the watchdog timer triggers, indicating a fault condition.
Building a 20A current monitor circuit using UCC3926 IC is a simple and cost-effective way to measure the current in a circuit accurately. The UCC3926 IC is an excellent choice for applications that require high accuracy and reliability, such as power supplies, motor control circuits, and battery charging systems. With its low quiescent current and overvoltage protection circuit, the UCC3926 IC is ideal for battery-powered applications. Overall, the 20A current monitor circuit using UCC3926 IC is a versatile and reliable solution that can be used in a wide range of applications.
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