ISL6842IUZ-T

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AnalogicTech ISL6842IUZ-T is a PWM controller IC which works with an external MOSFET to build up a high efficiency AC/DC or DC/DC converter. It is designed to target applications with wide range of output power, that require a high-performance solution with high efficiency efficiency and the capability to interact with external components over a wide input voltage range.

The applications targeted by this device are high performance AC/DC and DC/DC converters for various applications, such as notebooks, mobile phones, automotive, consumer electronic equipment and industrial control systems. Moreover, this device possesses a wide range of features which makes it suitable for wide variety of applications, such as adjustable current limiting, any overvoltage protection, overcurrent protection and thermal shutdown, automatic voltage and current scaling, etc.

ISL6842IUZ-T Working Principle

The ISL6842IUZ-T provides a complete PWM solution, which consists of an oscillator and PWM controller, and a pair of high-side and low-side drivers. It is designed to accept an input voltage range from 2.3V to 32V, which makes it suitable for a wide variety of applications. The device combines good efficiency and performance, as well as low EMI/RFI and low RF leakage.

The main feature of the device is its wide input voltage range, and it also includes several protection features such as adjustable current limit, and overvoltage protection, overcurrent protection and thermal shutdown, automatic voltage and current scaling. It also has adjustable switching frequency, enabling better performance at different output load conditions.

The PWM controller provides a single output for the gate drive of an external MOSFET pair. The high-side and low-side drivers are constructed using dedicated N-channel MOSFET transistors to reduce switching losses. They are configured to drive the external MOSFET or IGBT in synchronous rectification or buck topology.

The PWM controller uses the fixed frequency, variable on-time current mode control scheme to generate the PWM signals. The pulse-width modulation is implemented in a way where the current loop control is started first, based on a preset output limit, followed by a voltage loop control in order to regulate the output voltage.The controlling loop also features an additional loop compensation to prevent overshoot and undershoot.

Conclusion

The AnalogicTech ISL6842IUZ-T is a high-performance controller IC which is intended for high efficiency AC/DC and DC/DC converters. It offers a wide range of protection and control features such as adjustable current limit, overvoltage protection, overcurrent protection and thermal shutdown, and adjustable switching frequency. The device is suitable for a wide range of applications, including notebooks, mobile phones, consumer electronics, industrial control systems and automotive systems.

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