12V 50W Switching Regulator by UC3844N

This is a simple, low-cost 50W off-line switching power supply designed for home projects or for learning about the operation of flyback converters. It operates over a universal AC input range of 90-264 VAC and provides a 12V DC output with a load capacity of over 4A. The line and load regulation is better than 0.5%. The unit includes protections against overcurrent, overtemperature, and overvoltage, as well as passive inrush current limiting. The output ripple is approximately 0.2V. To reduce ripple further, an additional output LC filter may be added.

The described power supply is a versatile device suitable for various applications, particularly in educational settings where the principles of flyback converters can be explored. Its design allows for operation across a wide range of AC input voltages, making it adaptable to different electrical environments. The output specification of 12V DC at more than 4A allows for powering multiple devices or circuits, emphasizing its utility in practical applications.

The power supply's regulation features ensure that both line and load variations do not significantly affect the output voltage, maintaining stability under changing conditions. The specification of better than 0.5% regulation indicates that the output voltage will remain within a narrow band, enhancing the reliability of connected devices.

Safety and reliability are paramount in power supply design. The inclusion of overcurrent, overtemperature, and overvoltage protections safeguards the power supply and connected loads from potential damage due to fault conditions. The passive inrush current limiting feature is also critical, as it prevents excessive inrush current during startup, which can lead to component stress or failure.

Output ripple is a common concern in power supply design, as excessive ripple can affect the performance of sensitive electronics. The stated output ripple of approximately 0.2V is relatively low, but for applications requiring even cleaner power, the recommendation to add an additional LC filter is prudent. An LC filter can effectively smooth out voltage fluctuations, providing a more stable output.

In summary, this 50W off-line switching power supply is a robust and efficient solution for a variety of applications, particularly in educational environments where understanding the operation of flyback converters is essential. Its safety features, regulation capabilities, and adaptability make it a valuable component for home projects and experimentation.This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters. It can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load.

Line and load regulation is better then 0. 5%. The unit has overcurrent, overtemperature and ove rvoltage protections as well as passive inrush current limiting. Output ripple are approximately 0. 2 V. If you need to lower ripple you may put an additional output LC filter. 🔗 External reference