ISL6277AHRZ-T

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ISL6277AHRZ-T is a high-performance device from Intersil, a leading provider of power management solutions. It is a single-phase Active ORing controller, which provides efficient and reliable power conversion for system-level applications. The device is ideally suited for applications such as power-over-Ethernet (PoE) and solid-state drives (SSDs), as well as for the power conversion of high-voltage rail systems.

The ISL6277AHRZ-T integrates a single controller and two ORing FETs on a single chip, which simplifies the design and reduces the component count. It is designed to provide seamless and reliable power transfer between power sources. This device also offers protection against reverse current, current synchronous rectification, overvoltage protection, and load shedding. It is designed to preserve the power source with overcurrent, short circuit, and overtemperature protection.

The ISL6277AHRZ-T offers high operating efficiency and its wide operating temperature range ensures longer product lifetime. It also has a low quiescent current of 26μA, which makes it suitable for energy-conscious applications. The device is available in a small form factor, with a 16-pin TSSOP package size of 4.4mm × 5.0mm.

The ISL6277AHRZ-T’s main application field is in power-over-Ethernet (PoE) applications. It is used to perform critical functions including reverse current protection, current synchronous rectification, overvoltage protection, and load shedding, thus ensuring reliable power transfer. It is also used for power conversion of high-voltage rail systems, ensuring a safe and stable power delivery.

Working Principle of the ISL6277AHRZ-T

The working principle of the ISL6277AHRZ-T is based on Active ORing. Active ORing enables reliable power conversion between multiple power sources by utilizing intelligent FET control. When two sources are connected to the device, the internal FET control circuit compares the voltage of each source and selects the source with the highest voltage. The device then latches the highest voltage source for power delivery. This ensures that the connected system does not experience drops in power, even if one of the sources fails or drops in voltage.

The ISL6277AHRZ-T also provides short circuit and overcurrent protection. When either of these events occurs, the controller immediately cuts off the current to the output to ensure the safety of the connected system. It also has output voltage droop protection, which activates if the current being delivered is nearing the maximum current limit. When this happens, the output voltage will drop proportionately so that the device can continue to deliver current. The device also has load shedding capability, which will reduce the load current if it exceeds the nominal current limit.

Overall, the ISL6277AHRZ-T is an ideal choice for a number of special purpose applications, thanks to its compact size, high operating efficiency, and reliable power conversion capabilities. It provides efficient and reliable power management solution for PoE and high-voltage rail system applications, and offers advanced protection features for improved safety. The device is a valuable addition to Intersil’s portfolio of power management solutions.

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