THN 15-4821

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DC DC Converters are an important class of electrical devices that are used to convert a given direct current (DC) voltage into a specific, desired output voltage. The THN 15-4821 is a type of DC DC converter based on advanced monolithic technology and designed to address the specific needs of a wide range of applications, from basic power supply to more complex power management systems. This article will focus on the application field and working principle of the THN 15-4821.

Application Field

The THN 15-4821 is a highly integrated step-down converter with an adjustable output voltage from 0.8V to 5.5V. It is designed specifically for portable electronic devices. It provides excellent efficiency with a wide input voltage range of 2.7V-16V, allowing it to be used in a variety of different power sources for a range of applications, from handheld computers to cell phones. The 15-4821 is designed for both high-current and high-voltage devices, with the ability to output up to 1.5A and the option to stack two or more units if higher currents are needed. The chip is also designed to be low-noise and low-EMI, making it ideal for applications such as radio communication, medical equipment, and audio processing, where low background noise is essential.

Working Principle

The THN 15-4821 features a peak-current-mode control architecture, which is based on the principle of tracking the inductor current. When the load decreases or increases, the inductor current is compared to a reference voltage that is set by the user. When the current reaches the reference voltage, it is sensed by the internal oscillator, which in turn triggers a pulse-width modulation (PWM) signal, modulating the on-time of the output to maintain the regulation accuracy. In addition, the on-time of the output can also be set manually using an external resistor. The output voltage level is set by adjusting the internal reference voltage with the external resistor.

The THN 15-4821 also has a built-in protection circuit, which helps protect the device and its load from any overvoltage or overcurrent conditions that may occur. Additionally, the 15-4821 has an auto-restart mode which allows the device to restart in the event of a short or open load. This prevents the system from locking up during the power-up sequence, allowing it to remain operational.

Conclusion

The THN 15-4821 is a highly integrated step-down DC DC converter designed to address the specific needs of a wide range of applications, from basic power supply to more complex power management systems. It is designed specifically for portable electronic devices and features a peak-current-mode control architecture to ensure high efficiency and accuracy. Additionally, the 15-4821 offers several protections, such as overvoltage and overcurrent protection, an auto-restart mode, and the ability to stack multiple units for higher current output. This makes it ideal for applications such as radio communication, medical equipment, and audio processing.

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