UC3842

The UC3842 chip is a high-performance fixed frequency current mode controller. Common manufacturers are: Onsemi Semiconductor, Fairchild Semi, Texas Instruments, Motorola and other companies. According to different manufacturers, the prefixes of their models are different, but their performance is basically the same, and they can replace each other. This chip is designed specifically for offline or DC/DC converter applications, providing a cost-effective solution that requires minimal external components. Widely used in switch power circuits such as displays and chargers. In previous applications in products, the chip has always played a role in outputting a fixed voltage. With the further development of application requirements and the requirement of adjustable output voltage proposed in many occasions, the article discusses the mature product UC3842 using a microcontroller for voltage regulation control circuit.