ISL6841IU-T

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ISL6841IU-T is a single-phase PWM controller designed for synchronous buck applications. It is part of Intersil’s Automotive PWM portfolio and provides a compact, low power solution for tightly regulated DC-DC (synchronous buck) converters used in automotive, industrial and other high reliability applications. It is based on the latest process technology and enables a complete solution with minimal external components. ISL6841IU-T is optimized for a wide range of applications for which the input voltage is higher than the output voltage.

Application Field:

ISL6841IU-T is used in various automotive, industrial, and other high-reliability applications. It is designed to regulate power to critical loads in a variety of power supply topologies, such as synchronous buck, SEPIC, and flyback. It has programmable current sensing range, programmable output voltage and switched mode frequency up to 1.5MHz. It is also capable of providing high power density and high efficiency power solutions.

Working Principle:

ISL6841IU-T’s buck converter PWM control device has two major components: a voltage regulator and a high-side and low-side buck driver. The voltage regulator portion monitors the output voltage and adjusts the switching frequency, current limit and other system controls. The high-side and low-side buck driver portion provides the output power switch drive for the power stage. Furthermore, the pulse width modulation (PWM) technique is used to achieve the desired output voltage. The ISL6841IU-T can be used with a single-ended primary inductor converter (SEPIC) or any other topology.

With its integrated overvoltage protection (OVP) feature, the ISL6841IU-T prevents the output voltage from exceeding its preset user-defined upper limit. This OVP feature provides valuable protection to the system and safeguards the load. Additionally, the controller includes an output transistor thermal management system that reduces switching frequency when the power stage is approaching its thermal threshold. This allows the device to operate safely within its temperature range and protect against potential damage.

The ISL6841IU-T also integrates an adjustable soft-start feature to minimize current surge during start-up. To precisely regulate the output voltage over a wide variation in input voltage, the controller includes a high-accuracy voltage feedback loop.

To minimize EMI and power consumption, the device is capable of entering into a low-noise mode. It can operate in discontinuous conduction mode (DCM) and can be configured to operate as a single phase voltage source converter (VSC). The device also features an adjustable output current limit and auto burst mode control (ABMC).

In summary, ISL6841IU-T provides an integrated, high-performance solution that is capable of providing reliable, highly efficient and low noise power solutions. It is a well-suited controller for advanced synchronous buck applications in the automotive, industrial, and other high-reliability power conversion applications.

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