ISL1801IVZ

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ISL1801IVZ Application Field and Working Principle

The ISL1801IVZ is a programmable current-mode PWM controller with integrated high and low-side MOSFET drivers for use in application fields and systems such as offline voltage converters, universal motor control and general-purpose motor control. The integrated high and low-side MOSFET drivers make the IC ideal for applications such as dimmable LED drivers, smart power switches, buck-boost converters and, as mentioned, various motor control applications.

The ISL1801IVZ device is a member of Intersil’s ISL1801xx series devices, who have the same core operating principle, input voltage range and driver capability. The ISL1801xx devices offer an enhanced design flexibility, setting up the platform to utilize either an isolated controller or standard isolated motor driver circuit, allowing implementation of an optimized power stage design.

Application Field

The cost-effective ISL1801IVZ controller is widely used in Universal Motor Control and other motor control applications. It is suitable as a reliable motor drive in a range of motor driver applications such as scroll compressor, air condition conditioner, and refrigerator.

The device can be used to implement a quad current-mode architecture, which allows the design of highly efficient and flexible power conversion topologies, such as Buck, Buck-Boost, Fly-Buck, SEPIC, and Low-Power Boost. Because the device offers two switching modes (current-mode and voltage-mode), it can be optimised for different output voltages and frequencies.

In addition to motor control applications, the ISL1801IVZ can also be used in dimmable LED drivers to instantaneously step down and boost voltage at various brightness levels. It is also suitable for smart power switches and buck-boost converters.

Working Principle

The ISL1801IVZ is a programmable current-mode PWM controller with integrated high and low-side MOSFET drivers. It relies on a unique charge pump architecture and a multi-control-option architecture, which allow system-level control of the low-side and high-side FETs, allowing designers to achieve higher efficiency and faster transient response.

The IC’s built-in high-side MOSFET ensures symmetrical duty cycles for the two transistors, and this makes it ideal for use in synchronous buck circuit applications. Furthermore, the high-side MOSFET also makes the IC compatible with buck-boost DC/DC converters, which is critical for applications requiring a stepped up output from a lower input voltage.

The IC features a wide voltage range, from 6V to +25V, and can be used with input voltage levels as low as 3.3V, which enables the design of step-up buck-boost converters, such as flyback-type topologies, low power boost and SEPIC.

The ISL1801IVZ also includes overload protection and fault response functions, which help protect the application against damage in the event of abnormal input voltage or output current events. This makes it an ideal choice for applications requiring enhanced system durability and reliability.

The IC is also optimized for low power consumption, and its comprehensive programmability makes it easy to integrate into other applications. It also includes low standby current and low gate output leakage current, making it highly suitable for use in battery-operated systems.

Conclusion

The ISL1801IVZ is a programmable current-mode PWM controller with integrated high and low-side MOSFET drivers. It is suitable for Universal Motor Control and other motor control applications, as well as dimmable LED drivers, smart power switches and buck-boost converters. Its wide voltage range, from 6V to +25V, makes it compatible with input voltages as low as 3.3V. It also has embedded overload protection and fault response functions. The IC is optimized for low power consumption and its comprehensive programmability makes it easy to integrate into other applications.

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