ISOW7843FDWER

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Digital isolators are very important components used to prevent undesired connections in electrical systems. The ISOW7843FDWER is a popular digital isolator used in many applications to provide galvanic isolation between two circuits. In this article we will discuss the application fields and working principle of the ISOW7843FDWER.

The ISOW7843FDWER is most commonly used for power supply circuit protection and low-power signal transmission applications. For power supply protection, the ISOW7843FDWER prevents overvoltage and overcurrent generated by the power supply from entering the logic circuits, thus protecting the logic circuits from being exposed to high voltages or currents. For low-power signal transmission, the ISOW7843FDWER is used to transmit and receive digital signals between two circuits, while isolating them electrically. This prevents signal interference, noise, and ground loops from affecting the accuracy of the transmitted and received signals.

The working principle of the ISOW7843FDWER is simple yet effective. Inside the isolator chip is a small transformer whose primary and secondary coils are isolated by a silicon substrate, forming a high-intensity “magnetic bridge”. When input voltage is applied to the primary coil, a voltage is induced at the secondary coil, which is sent to the output circuit. The isolator’s chip uses a voltage clamp circuit to limit the output voltage, ensuring that only the acceptable input voltage is transmitted to the output circuit.

In addition to the transformer, the ISOW7843FDWER also consists of two analog switches, a pair of power MOSFETs, and a dual-supply operating voltage (2.4-14.5 V). The input signal is applied to the control switch, which activates the digital isolator and triggers the analog switches. The analog switches then activate the power MOSFETs, which open the circuit and allow the output signal to transmit across the isolated gap effectively.

In summary, the ISOW7843FDWER digital isolator is a versatile component suitable for multiple applications, such as power supply protection and low-power signal transmission. It works by providing galvanic isolation between two circuits though the use of a high-intensity transformer and a pair of power MOSFETs. The application fields and working principle of the ISOW7843FDWER has been discussed in-depth in this article.

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