SI82398CD4-IS

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Isolators are components that separate two or more electrical circuits, disconnecting the input from the output. They ensure that there is no electrical contact between the two circuits, meaning that there is no exchange of electrical signals either. One of these isolators is the SI82398CD4-IS, an Isolated 2-channel driver that is used to drive both N-channel and P-channel MOSFETs/IGBTs as well as low-side and high-side switches. In this article, we will take a closer look at the SI82398CD4-IS gate driver, including its application field and working principle.

Application Field of SI82398CD4-IS

The SI82398CD4-IS Isolated 2-channel driver is designed for applications requiring two isolated signals to drive a variety of switching loads. It is especially suitable for applications where isolation and safety are paramount. From automotive applications such as motor control to industrial applications such as machine automation and power-supply monitoring, the SI82398CD4-IS isolator has wide-ranging market applications. The device features an integrated regulator, allowing it to operate from standard 5-V to 15-V supply rails.

Working Principle of SI82398CD4-IS

The SI82398CD4-IS isolator consists of a regulator and a side-winding transformer. The regulator, powered by a regulated supply, maintains a constant supply voltage to the side-winding transformer. The transformer then triggers the output transistor to on-state, driving the output gate. The on-state triggers the switching load, activating the desired circuit. When the regulator is removed, the side-winding transformer turns off the output transistor, returning the output gate to the off-state. This prevents the transistor from turning on again until the regulator is reapplied and the process is repeated.

The input circuit and output circuit are isolated by non-conductive material that eliminates the need for external isolation. The isolator has a low total dc-current consumption, and can handle up to 2 A of total current. It also provides fast pulses and can operate up to 25 MHz. In addition, the input-to-output isolation voltage is 5 kV, ensuring that the electrical signals are isolated between the two circuits.

Conclusion

In conclusion, the SI82398CD4-IS Isolated 2-channel driver is an isolator designed for applications requiring two isolated signals. It features an integrated regulator, allowing it to operate from standard 5-V to 15-V supply rails. The device consists of a regulator and a side-winding transformer that triggers the output transistor to on-state, driving the output gate. The input circuit and output circuit are isolated by non-conductive material, while the total dc-current consumption and operating frequency are low. Therefore, the SI82398CD4-IS is particularly suitable for applications where safety and isolation are essential.

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