TL5001ACDR Integrated Circuits (ICs)

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Switching DC-DC controllers are widely used in numerous consumer, industrial and automotive power applications. The TL5001ACDR is one such DC-DC switching converter offered by TI that is used for different applications. It is a hybrid analogue-digital controller that can accuracely control switching converters of various topologies with cycle-by-cycle current limit and built-in under-voltage protection. This article aims to discuss the application field and the working principle of the TL5001ACDR.

Application Field

The TL5001ACDR is popularly used in applications such as digital audio systems and portable products. Examples include devices such as audio amplifiers, powered speakers, active headsets, laptop computers, cellular devices and tablets. Corporations such as Sony, Apple and Microsoft have either adopted it for their audio systems, or incorporated it into their lineup of products over the years.

In addition to consumer audio applications, the TL5001ACDR is used in a range of industrial applications such as automotive designs in which reliable and precise operation is needed. Examples of these applications include motor drives, solar power, lighting control systems and distributed power systems. In many of these applications, the TL5001ACDR provides power regulation solutions in extreme temperature ranges or tight spaces.

Working Principle

The TL5001ACDR works when no external power is required to drive the output switches. As an internal charge pump charges up, the voltage is compared with a precision reference voltage. If the voltage is equal to or greater than the reference voltage, a latch turns on the output switch and cycles start.

To obtain the fast transient response and inherent safety features, the TL5001ACDR adds a dual-loop architecture to the switching converter. This dual-loop architecture consists of an outer loop for the output voltage regulation and an inner loop for the current sense limit. Both loops are designed to respond quickly to changing conditions, such as overloads or short circuits, in order to provide reliable and accurate operation.

The output voltage loop consists of a transconductance amplifier and an error amplifier with a band gap reference voltage. A feedback voltage setpoint is compared with the actual output voltage by the error amp, and any error is amplified to the transconductance amp. The transconductance amp is used to drive the output switch in the desired direction.

The current sense limit loop is an integral part of the switching cycle. An internal current limit is monitored continually at the input of the switches in order to provide cycle-by-cycle current limit and at the same time, provide a built-in over temperature protection. The voltage comparison to the reference voltage is also checked to provide over-voltage protection.

Conclusion

By using the combination of an analogue-digital controller, the TL5001ACDR is capable of providing reliable, precise operation for a wide range of applications from the audio systems found in iPhones and laptops to the motor drives and solar power applications found in industrial applications. The level of accuracy is remarkable, as the TL5001ACDR provides cycle-by-cycle current limit and built-in under-voltage protection.

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