ISL61862CIRZ

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Introduction

The ISL61862CIRZ is a current-mode, Hot Swap, peak-current limited controller specifically designed to provide an efficient and reliable solution when powering FPGA’s or other digital loads. The ISL61862CIRZ application field includes components such as digital signal processors and ASICs, as well as any type of digital circuits that require high current with fast rise times. The ISL61862CIRZ works by providing continuous current-mode peak-current limited regulation, with soft start operation and thermal protection, making it the ideal solution for hot-swap applications.

Features

The ISL61862CIRZ incorporates many features to ensure a safe and reliable power management solution. These features include:

• Current Mode Control: The ISL61862CIRZ uses a current mode control principle to ensure accurate current regulation over all ranges of input voltage, as well as an adjustable peak current limit.
• Protection Features: The ISL61862CIRZ contains protection against overvoltage and undervoltage, as well as overcurrent, over temperature, and short-circuit protection.
• Soft Start: The controller has an adjustable soft start to reduce inrush current at power-up, as well as several excellent EMI reduction techniques.
• Limited Power Dissipation: The device includes a limited power dissipation feature which reduces the power dissipation of the internal pass MOSFETs.

Working Principle

The ISL61862CIRZ uses a constant current, peak current limited, peak current control (CPC) architecture. This architecture allows the output voltage to be precisely controlled by adjusting the peak current limit. The current limit is adjustable through an external sense resistor, allowing for a wide range of output voltages and currents.

The CPC architecture also uses a soft-start feature to minimize inrush current at start-up and to minimize output voltage droop during fast load transients. When the input voltage rises, the controller will slowly increase the output current until the peak current limit is reached. The controller employs an over voltage protection circuit to prevent excessive voltage increases during start-up and load transients.

In addition to the input and output protection features, the device also provides thermal protection. In the event of an overload or a fault condition such as a short, the device shuts off the internal pass MOSFETs, reducing the power dissipation in the internal circuitry.

Conclusion

The ISL61862CIRZ from Intersil is an efficient, reliable, and highly featured Hot Swap controller for FPGA’s and other digital loads. With its current mode control, adjustable peak current limit, soft start, and thermal protection features, the ISL61862CIRZ is the perfect solution for powering digital loads.

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