HCPL-3120#060

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HCPL-3120#060: Isolators - Gate Drivers Application Field and Working Principle

The HCPL-3120#060 (Optocoupler/Opto-Isolator) is an isolator designed with an application field in electric power systems and circuits, specifically as a gate driver. It has been developed as part of the well-known line of Optocoupler products, integrating a controller and an innovative signal isolator into one discrete package. The HCPL-3120#060 features 8 channels, and each channel may be configured for either open-drain or push-pull output.

The working principle of the HCPL-3120#060 relies upon a photocoupler. That is, a component composed of two parts; an LED and a photo-detector. The LED is situated at one terminal, transmitting light, and the photo-detector is connected to the other terminal, receiving the light which has been transmitted. In this way the signal or voltage through one path is isolated from the signal or voltage on the other. The HCPL-3120#060 structure is such that its optocoupler input is positioned in a format which allows it to receive gate signals from field hardware.

The 8-input optocoupler array is optimized to deliver up to 1000mA peak output current, while maintaining very low duty cycle distortions such as overshoot, undershoot, and delay time. This high level of stability allows a precise control over complex gate patterns, making it ideal for applications such as flash-based gear boxes, high voltage DC-DC converters, and permanent magnet motors. The HCPL-3120#060 can also feature an integrated temperature sensor which monitors the temperature of the gate drivers and heatsink, thus enhancing system reliability.

The HCPL-3120#060 also incorporates the capability for biasing the photodetector in order to reduce the offset voltage. This provides more consistent modulation signal performance at various optocoupler input current levels. The photon-coupled output characteristic is such that it may be configured for either open-drain or push-pull output. The open-drain output typically applies to devices that require power MOSFETs while the push-pull output typically applies to devices that require lower output voltage and current.

Overall, the HCPL-3120#060 provides exceptional signal isolation, improved sensitivity and greater reliability for applications requiring the conversion of signals from one form to another. It is designed to provide significant cost advantages over other types of optocouplers and gate drivers, while at the same time offering enhanced features, such as integrated temperature sensing, improved optocoupler input sensitivity, and the option for open-drain or push-pull output configurations. As such, the HCPL-3120#060 stands out and is suited to many applications calling for the safe and reliable conversion of one signal form into another across galvanic isolation.

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