ISL6565ACR

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The ISL6565ACR is a DC DC switching controller from Intersil that provides a variety of features to help simplify designing and implementing DC DC power supplies. This controller is well-suited for point of load (POL) DC to DC conversion, battery discharging and charging, and other applications that require precise current and/or voltage regulation.

Application Fields

The ISL6565ACR DC DC switching controller has a broad range of applications. It is used in a variety of industries, such as automotive, communications, computing, industrial, lighting, medical, personal electronics, and power management. Some applications include:

• Automotive DC to DC converter module (CDH)
• Automotive point of load (POL) DC to DC converters
• Battery discharging and charging
• Non-isolated polarity power-supply converters
• On-card DC to DC converters
• On-card power management
• DC to DC converter modules

Working Principle

The ISL6565ACR DC to DC switching controller employs a synchronous buck topology for regulating output voltage. It accepts either an external voltage divider or an internal resistive divider to monitor the output. The output voltage is regulated by adjusting the on-time of the converter’s power switch, resulting in a constant output frequency with average current-mode control. In addition to providing an adjustable output voltage range of 0.8 V to 5.5 V, it offers a number of features and protections to enhance performance and reliability.

Interface and Functionality

The ISL6565ACR DC to DC switching controller features an integrated power MOSFET gate driver and a voltage regulator for providing power to the internal circuitry, such as the loop compensation circuitry, soft-start, and kill detector. It includes an external voltage setting pin that is used to determine the maximum output voltage of the converter. In addition, it has an external resistor divider for setting the output voltage accuracy, an input for detecting overcurrent and an output phase lead/lag pin for optimizing the phase relationship between the output voltage and the input voltage for power-supply designs that require phase compensation or optimization. Furthermore, the controller includes three different modes of operation – adaptive on-time, peak current-mode control and valley current-mode control.

Protection Features

The ISL6565ACR DC to DC switching controller provides several protection features to ensure reliable and safe operation. These features include short-circuit protection, over-temperature protection, and under-voltage lockout. Short-circuit protection is provided through an internal fault comparator and a current-limit circuit. The controller offers an adjustable over-temperature threshold and it can detect when the junction temperature exceeds this threshold, triggering a thermal shutdown of the circuit. Lastly, under-voltage lockout helps protect the circuit from damage caused by supply voltages that drop below the operating range.

Conclusion

The ISL6565ACR DC to DC switching controller is an ideal solution for implementing point of load DC to DC converters, battery discharging and charging, and other applications that require precise current and/or voltage regulation. Its integration of a power MOSFET driver, voltage regulator, loop compensation circuitry, soft-start, and kill detector with adjustable output voltage and advanced protection features provides a powerful and flexible solution for implementing DC to DC power supplies.

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