4420P-T03-330/390 Resistors

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Resistor networks and arrays offer a variety of solutions to meet different circuit requirements. The 4420P-T03-330/390 specifically offers an idea solution for those needing an adjustable resistor network that combines both resistors and diode protection. In this article, we\'ll take a closer look at this specific resistor network and discuss its application field and working principle.

Application Field

The 4420P-T03-330/390 adjustable resistor network is a surface mount device designed to provide precise current control in a wide range of applications. It is used in a variety of electrical and electronic components such as radios, televisions, computers, cell phones, medical products, automotive equipment, and more. It offers excellent noise immunity, low temperature drift, and compact reliable operation. It is a cost effective and reliable solution for applications that require precise current control, such as motor drives, DC/DC converters, and non-contact sensors.

Working Principle

The 4420P-T03-330/390 adjustable resistor network is composed of three equal valued resistors in series, with one resistor, the active shunt, connected to an adjustable current limiting diode. The diode serves two primary functions. First, it restricts the maximum amount of current to the resistor network. Second, the diode provides isolation so that if one resistor in the network fails, the other two resistors are unaffected. This makes the network highly reliable, as the resistor network is protected from overcurrent or short circuits.

The diode also serves as a current limiting reference device. It is connected to a reference voltage that sets the maximum current the resistor network can handle. When the voltage across the resistor network exceeds the reference voltage, the diode will conduct, limiting the current through the circuit. Thus, the resistor network can be thought of as a voltage divider that is adjustable by varying the reference voltage.

The 4420P-T03-330/390 resistor network also has an adjustable feature that allows the current to be set at a specific value. This is achieved by changing the reference voltage. This is done by adjusting a potentiometer that is connected to the reference voltage line. This allows the current to be adjusted to the exact value required for the application, ensuring the correct operation of the system.

Conclusion

As we can see, the 4420P-T03-330/390 adjustable resistor network is a reliable, cost effective solution for applications that require precise current control. Its robust design and adjustable feature make it perfect for a wide variety of applications. This resistor network is also relatively easy to install and provides excellent noise immunity and protection from overcurrent and short circuits.

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