ISL6115CBZA

PMIC - Hot Swap Controllers

ISL6115CBZA is a high performance hot swap controller device. This device is typically used as a poly-phase switch in high powered electronic systems that manage the power-up and power-down sequence for loads. It is mainly designed for non-isolated hot swap applications. This device offers attractive features such as an integrated soft-start, fault signaling, fast current foldback and active current sharing.

Application Field

The ISL6115CBZA is suitable for several non-isolated hot swap applications in high power systems. Typical applications include servers, storage, routers, switches, telecom, consumer and industrial applications. The device is configured as a polyphase switch for applications such as a battery charger, or a board powered by multiple AC sources. It is capable of handling three devices in parallel, with draw up to two amps, and a maximum input voltage of 55 volts.

Working Principle

The working principle behind the ISL6115CBZA is based on a limited-impedance system, where the current into the device is limited by a variable series resistance. This variable series resistance contains a feedback loop that reacts to input current and output voltage changes. The ISL6115CBZA is designed to work with a sense resistor in the input path of the device, so that it can accurately measure the input current.

The device provides the current limiting function during the power-up and power-down sequences of the load. During power-up, a narrow voltage rise time is chosen to gradually ramp up the input voltage. The limiting circuitry within the device will detect the input current and reduce the series resistance to reduce the inrush current and give a soft-start to the load. During power-down, the reverse current is detected and the series resistance is increased to reduce the power dissipation.

The ISL6115CBZA also features an active current sharing function to provide current balance between the three devices in parallel, to ensure that the load is evenly distributed. Additionally, the device also contains a current foldback circuit to limit the peak current under short-circuit conditions. When the current is sensed to be over a certain threshold, the device will automatically limit the current and protect the system from any damage.

Conclusion

The ISL6115CBZA is a versatile hot swap controller device designed for non-isolated applications for high power systems. Its integrated features such as a soft-start, fault signaling, active current sharing, and fast current foldback provide a great level of system protection and energy efficiency. The device can handle three devices in parallel with a maximum current rating of two amps and a maximum input voltage of 55 volts.