SI8282CC-IS

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The SI8282CC-IS isolator is a monolithic, single-channel isolated gate driver that combines a level-shifting optocoupler and a low-side FET driver in a single package. It is used for signal isolation, voltage level shifting and driving low-side MOSFETs. The isolated signal and the high side to low side switching functions are accomplished in one unit, without the need for an extra power FET or logic signal conversion.

The application field of the SI8282CC-IS isolator includes, but is not limited to, power conversion. The device is suitable for use in synchronous rectifier and polarity-reversal electric motor control applications, as well as in high-efficiency AC-DC and DC-DC power converters, where isolation of the high-side MOSFET and the low-side gate drive voltages is required.

The working principle of this device can be understood in terms of its two main components: the optocoupler and the FET driver. The optocoupler performs level-shifting and signal isolation functions, while the FET driver is used to drive the low-side MOSFET. The output of the optocoupler is connected to the input of the FET driver, and the output of the FET driver is connected to the gate of the MOSFET.

The input signal is connected to the optocoupler, which provides isolation and level shifting. The output of the optocoupler is then connected to the input of the FET driver. The FET driver then provides the necessary drive level for the low-side MOSFET, which is connected to the output of the FET driver. When the input signal is low, the output of the FET driver is also low, which keeps the MOSFET off. Conversely, when the input signal is high, the output of the FET driver is also high, which turns the MOSFET on.

In addition to level-shifting and signal isolation, the SI8282CC-IS isolator also provides overvoltage and short-circuit protection. The device integrates a voltage clamp circuit and a short-circuit protection circuit, which keep the FET driver from being damaged due to overvoltage or short-circuit conditions. The integrated protection circuits help to reduce system complexity and cost.

The SI8282CC-IS isolator is a modern isolated gate driver that combines level-shifting optocoupler and FET drivers in one package. It is used in a wide range of applications, such as synchronous rectifiers, polarity-reversal motor control, and AC-DC and DC-DC power conversion. It provides isolation, level shifting, overvoltage and short-circuit protection, making it an ideal choice for those applications.

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