PT6674D

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DC-DC converters, also known as switching regulators, are gaining in popularity as they offer improved efficiency, temperature performance, size, and weight compared to linear regulators. The PT6674D is a two-phase synchronous rectified Buck-Boost DC-DC converter designed for high-performance, low-output applications. This integrated circuit can offer up to 95 per cent efficiency and support input voltages from up to 28 volts. Let’s take a look at the PT6674D’s application field and working principle.

PT6674D Application Field

The PT6674D is designed to regulate voltage levels in two ways: buck or boost. Buck regulators reduce voltage levels, while boost regulators increase voltage levels. This DC-DC converter can provide an output voltage between 2 and 28 volts. The key features that make the PT6674D suitable for output applications include excellent adjustable voltage accuracy and superior transient response times. Additionally, this two-phase synchronous rectified Buck-Boost DC-DC converter can support up to 12 A continuous current.

Applications that require power conversion from a lower voltage source to a higher voltage level can make use of the PT6674D. The chip comes with integrated bootstrap diode circuitry, meaning the Buck-Boost DC-DC converter can achieve an output voltage higher than its input voltage. This is essential in applications that require higher voltages than what is supplied to the chip. Examples of these applications might include power supplies for industrial robots, DVD players, and medical devices.

PT6674D Working Principle

The PT6674D’s integrated switching power supply topology helps maintain a high-efficiency power conversion process. The internal topology of this two-phase synchronous rectified Buck-Boost DC-DC converter consists of two external MOSFETs, a Buck and Boost controller block, a bootstrap diode circuit, and synchronous rectification blocks. The Buck and Boost controller block controls the two MOSFETs to switch each phase at a fixed frequency. The rectification blocks, which utilize digital signal processors (DSPs) and field-programmable gate arrays (FPGAs), switch the synchronous rectification operation based on the voltage levels of the output capacitor.

This switching power supply topology helps the chip provide a considerable amount of output power while maintaining low output ripple and high transient response times. Additionally, it keeps losses due to switching to a minimum. Other characteristics of the PT6674D include temperature protection and overvoltage protection.

Conclusion

The PT6674D is a two-phase synchronous rectified Buck-Boost DC-DC converter designed for high-performance, low-output applications. Its switching power supply topology and other features make it a great choice for applications that require power conversion to higher voltage levels. It can offer up to 95% efficiency, temperature protection, and superior transient response times. With its adjustable voltage accuracy and ability to support up to 12 A current, the PT6674D can be relied upon for various applications.

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