HCPL-3120-300E

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The HCPL-3120-300E isolator, from Avago Technologies, is an entrée in the company’s isolator-gate driver line. This product family is designed to meet designers’ needs for galvanically isolated channel-to-channel level shifting, power supply threshold control and bus power backup.

The HCPL-3120-300E is a perfect fit for applications involving multi-channel buses, such as SCSI, I²C, and RS-485. Its channels are filled with optically-isolated ICs, each designed to carry signals between two separate power domains. The HCPL-3120-300E offers reliable data transfer between the two power domains, with low power dissipation and isolation voltage of 8kVrms. In addition, it integrates several features such as auto-zeroing and multi-bit decoding.

The HCPL-3120-300E is suitable for use in extreme environments, since it meets automotive and industrial temperature specifications. It also incorporates a wide operating voltage range, from 2.5 V to 5.5 V and can handle up to 150 mA of current. Lastly, it provides excellent EMI and ESD immunity, with guaranteed switching times for on/off TTL signals of 4 µs.

The HCPL-3120-300E is constructed using Avago’s HotLink technology, which is optimized for high-data transfer rates and low-power operation. This technology provides galvanic isolation between two power domains, which eliminates the possibility of ground loop problems. Furthermore, the HotLink technology ensures that power is consumed only when a data frame is being transferred, thus increasing the product’s overall efficiency.

In terms of working principle, the HCPL-3120-300E utilizes an optical barrier consisting of infrared LEDs and phototransistors. When a data frame is sent from one power domain to the other, the HCPL-3120-300E’s LEDs are energized, creating an optical signal. This light signal is received by the phototransistor on the other side of the barrier, which amplifies the signal and converts it into an electrical signal that can be routed to the correct place in the system.

In summary, the HCPL-3120-300E isolator from Avago Technologies is a versatile gate driver solution that provides galvanic isolation between two power domains, allowing designers to create multi-channel systems without worrying about ground loop problems. Thanks to its HotLink technology, this product is capable of operating with low power consumption and high data transfer rates, making it ideal for a wide range of applications, from automotive and industrial to consumer and computer.

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