ISL6845IU-T

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The ISL6845IU-T is a high frequency DC/DC buck switching controller with integrated FETs and reference voltage, designed to deliver maximum efficiency over a wide input voltage range. The buck controller is capable of delivering up to 4A output current at a single output and has adjustable switching frequency up to 1MHz. It offers extended protection options, external compensation and is designed to minimize overshoot and ringing at the controller output. In addition, the ISL6845IU-T is designed to be used in a wide range of PMIC (Power Management Integrated Circuit) applications such as automotive and industrial systems.

Application Field

The ISL6845IU-T is capable of providing an efficient power conversion solution for wide input voltage ranges, making it suitable for various automotive and industrial applications. The automotive applications include various automotive battery supply systems, such as 12V and 24V on-board vehicle electrical systems and 12V and 24V starting, charging, and lighting systems. The industrial applications include DC/DC converters, poE (Power over Ethernet) and power supplies for industrial equipment.

Working Principle

The main components of the ISL6845IU-T include an internal MOSFET, a reference voltage and an analog PWM controller.The MOSFET is responsible for carrying the main DC current path of the power conversion operation. In order for the MOSFET to operate correctly, it needs to be switched on and off at the appropriate times. This is accomplished through the use of the internal PWM controller, which is responsible for generating the switching signals for the MOSFET. The reference voltage is used to set the output voltage of the regulator.

In order to start power conversion, the Input voltage must be applied first. The PWM controller then creates a triangular waveform and compares it with the reference voltage. If the PWM controller detects that the input voltage is higher than the reference voltage, it will turn on the MOSFET. The energy stored in the inductor is then transferred to the output capacitor, charging it and creating an output voltage. Once the input voltage drops below the reference voltage, the PWM controller will turn off the MOSFET, stopping power conversion.

Conclusion

The ISL6845IU-T is a high frequency DC/DC buck switching controller with integrated FETs and reference voltage, making it ideal for automotive and industrial applications. It offers extended protection features, external compensation, adjustable switching frequency up to 1Mhz, and is designed to minimize overshoot and ringing of the output voltage. The buck controller is capable of delivering up to 4A output current at a single output, providing an efficient power conversion solution for wide input voltage ranges.

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