SI8261BCA-C-IS

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Isolators and Gate Drivers are essential components in many industries where signals and power must be transferred between two spaced systems. In these instances, Isolators are responsible for providing accurate and reliable signal isolation, as well as creating a secure pathway for power transmission. Gate Drivers are responsible for providing the necessary current for the gate of a power transistor to be turned on and off in a reliable and accurate manner. The SI8261BCA-C-IS is an integrated isolator and gate driver IC from Silicon Laboratories Inc. This device is used by circuit designers to allow non-isolated control over isolated channels, providing the functions of galvanic isolation and a high-efficiency (up to 96%) gate driver.

The SI8261BCA-C-IS has an integrated 100V input-to-output isolation voltage, allowing designers to create DC-to-DC isolated power sources. This also makes it suitable for isolated power converters, providing input-output signal switching and the necessary level shift to transfer signals. The device provides 2A output current for driving the FET/MOSFET gate, ensuring fast and reliable switching. The device also features a 600kHz switching frequency, as well as 3A peak source current and 1.5A peak sink current. In addition, the integrated over-current protection and under-voltage lockout (UVLO) makes it highly reliable, as well as assuring designers that their power circuit will remain completely safe and undamaged.

The SI8261BCA-C-IS application field includes motor drives, power converters, automotive and avionics systems, military communication systems, industrial automation, and communications equipment. The device’s output-to-input signal transmission is calculated using a probe and photo-detection method, isolating it from ground noise and EMI interference. The device also features a wide input voltage range, from 9V to 30V, allowing designers to power their circuit from a single or multiple DC power sources. This makes it suitable for powering localized and distributed systems, as well as different types of motors and drives.

In regards to the device’s working principle, the SI8261BCA-C-IS works in the following steps: First, the input signal is amplified by the isolated amplifier, and then passed to an integrated voltage-controlled oscillator (VCO) that is used for signal modulation. The signal is then passed to the output driver, which is responsible for producing the required current. The output current is then transferred to the FET/MOSFET gate via the Isolated Gate Driver. Finally, the isolated output from the gate driver is used to control the FET/MOSFET, allowing for an isolated ON/OFF state change.

The SI8261BCA-C-IS is a highly versatile IC, as it is compatible with both single- and multi-pulse control schemes, provides 3-pin pulse width modulation (PEM) control modes, and includes built-in over-voltage protection circuitry. Additionally, the device is capable of operating in temperatures ranging from -40°C to 85°C, allowing its use in a variety of environmental conditions. As such, the SI8261BCA-C-IS can be used in a wide array of applications, from motor drives to power converters, communications equipment, and industrial automation.

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