PT8121N

DC-DC converters are designed to facilitate the conversion of incoming power from one voltage to another. One of the more popular devices in this field is the PT8121N, which is a single-channel DC-DC converter designed to provide adjustable, isolated output power ranging from 0.8V to 8V. The PT8121N is ideal for applications where precise DC voltage output is required, such as power supplies, network communications equipment, consumer electronics, and other complex electronic products.

PT8121N Features

The PT8121N features an adjustable output voltage range from 0.8V to 8V, which may be fine-tuned with an external resistor. The device also provides excellent thermal performance, with a typical efficiency of 85%, and a full load condition of 4A. The converter utilizes an internal over-current protection limiting, as well as over-voltage protection and thermal shutdown. As such, it is designed to perform well in applications where extreme environmental conditions and high load currents are present.

The PT8121N has a wide operating temperature range of -40°C to 105°C, making it suitable for use in applications such as automotive systems, industrial control applications, and medical equipment. The device has an extremely low output ripple voltage, allowing for precise voltage regulation and excellent system noise performance. The converter is also capable of high-frequency operation up to 500kHz.

Working Principle

The working principle of the PT8121N is relatively simple. Incoming power is supplied to the input filter capacitor and flow transistor, which then provide the operating energy to the DC-DC converter. This transformer then steps down the input voltage to the desired output voltage, and the output voltage is further regulated by the internal synchronous rectifier and main switch. The output voltage is further controlled by the reference voltage, which is set by an external resistor.

The PT8121N is equipped with a frequency modulation control (FMC) circuit, which is designed to improve the system efficiency without sacrificing noise performance. This FMC circuit operates in two separate modes depending on the load, high frequency for low load and low frequency for high load, thus providing the system with stable, efficient and low-noise performance.

Conclusion

The PT8121N is a high performance single channel DC-DC converter designed for applications which require adjustable and isolated output power from 0.8V to 8V. With its wide operating temperature range, low output ripple voltage, high efficiency, and robust protection circuits, the PT8121N provides superior performance in numerous applications. The device also features an FMC circuit for improved system efficiency and noise performance.