SI8751AB-ASR

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Isolators are an important component of various electronics in industries with regular hazardous operation. Isolators are devices which enable two parties to communicate without the need for a physical connection which could endanger the safety of the operators. Isolators are often employed in I/O configurations and are used to achieve electrical isolation without compromising the signal integrity. Isolators are also used in power conversion, communication systems, medical equipment, aerospace and in various other applications. One of the more compact and versatile isolators is the SI8751AB-ASR, a gate drive isolator.

The SI8751AB-ASR is a small, low power, dual-channel isolation system designed for half-bridge applications such as Brushless DC Motors (BLDC), AC Induction Motors (ACIM) and Open-Loop Isolated Converters. The device provides digital isolation of up to 1500V and is designed to be used in both low voltage and higher voltage systems, as it offers a low 600 ns propagation delay time. The device is housed in an industry-standard small outline SSOP or SOIC16 package, making it ideal for board placement in small form factor systems. In addition, the device has an integrated on board gate driver which is used for driving the MOSFETs in a half bridge system.

The SI8751AB-ASR gate driver is designed for power switch applications, such as those found in Ionisers, BRD printers and other commercial equipment. The device is available in a variety of packages and offers several features to make the device well suited for a wide variety of applications. The device is capable of both positive and negative input voltage, making it a perfect choice for both AC and DC signals. The device also provides a wide input signal range of 8-20V, making it suitable for a variety of applications. The device also features an open-minute output driver suitable for driving both an NPN and PNP type MOSFET. Additionally, the device also features a reverse protection and over-voltage/over-current protection for safety and reliability.

From a working principle perspective, the SI8751AB-ASR utilises a simple four-stage topology. The device first converts input voltage from 8 to 20 Volt to a reference voltage of 7.5 V. The device then integrates with a comparator to detect the input signal values with a 6-bit resolution and converts them to an output signal voltage. The output signal is then driven over an insulated path to the gate driver, which is then responsible for driving the MOSFET. The device also has an LED indicator to show when the device is engaged.

The SI8751AB-ASR is an ideal choice for applications requiring high isolation, low-voltage operation and excellent signal integrity, and is used in a variety of applications such as for Brushless DC Motors (BLDC), AC Induction Motors (ACIM) and Open-Loop Isolated Converters. With a low power consumption, high-speed performance and robust design, the SI8751AB-ASR is an excellent choice for applications where isolation is required. The device is also available in a variety of packages, making it a great match for any system.

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