SI8717BC-A-IPR

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Digital Isolators

Digital isolators are electrical components that use galvanic isolation techniques to separate two highly interconnected electrical circuits. They are primarily used in the protection of sensitive electronic components in automotive and industrial applications. The most commonly used digital isolator is the SI8717BC-A-IPR, which is an integrated circuit (IC) that provides a low-cost, low-power isolation solution for applications such as motor control, automotive systems, and medical instrumentation.

Application Field

The SI8717BC-A-IPR is a bidirectional, isolated, enabling gate digital isolator that offers a high-speed, low-switching cost, low power solution for signal isolation on a wide variety of industrial and automotive control networks. It is suitable for use in numerous applications including motor control, automotive systems, medical instrumentation, and functional safety. The digital isolator provides an isolated galvanic path between two digital devices, allowing for signal and power isolation between a controller or system and the field devices. This isolator typically provides up to 2500Vrms of isolation between the digital devices, meeting or exceeding the requirements of major international safety standards.

Working Principle

The SI8717BC-A-IPR is a bidirectional, isolated, enabling gate digital isolator, which means that signals can be sent both ways through the isolator. The chip uses a combination of switching power MOSFETs and transformers to provide the electrical isolation between the input and output circuits. It is a combined one-channel device, and contains two generating circuits on the input side and two drives on the output side. The input and output circuits are optically isolated to avoid any interference or ground loop issues.

The chip includes an integrated self-oscillator that enables the high-speed switching between input and output signals. The maximum data transmission speed is 8Mbps and is clocked with an on-chip reference crystal. At the start-up of the chip, the logic control signals at the input and output sides will be synchronized. When the logic inputs on the input side are triggered, the data will be transferred to the output side according to the logic of the digital isolator.

Conclusion

The SI8717BC-A-IPR is an isolated digital isolator IC that is ideal for use in numerous applications including medical instruments, motor control, and automotive systems. It is a bidirectional integrated circuit that provides a low-cost, low-power solution for signal or power isolation between digital components. The high speed, low switching cost, and low power design of the SI8717BC-A-IPR make it an ideal solution for isolating digital signals and providing an electrical barrier between two circuits.

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