Overview:
This paper introduces a detailed design process of UC3843 controlled low-power multi-channel DC/DC module power supply, focusing on the difference between multi-output module power supply design and single-output, and introduces the new type of DC/DC module power supply. The design of the peripheral circuit parameters of the chip UC3843 gives the design process of the transformer and the coupled inductor in the power supply of the multi-output module and various problems that should be paid attention to in meeting various performance indexes.
DC/DC modules have been widely used in railway communications, microwave communications, industrial control, marine electronics, avionics, ground radar, fire equipment and medical equipment teaching equipment, many of which require multiple outputs, such as In the microcontroller intelligent controller, the single-chip power supply needs 5V, and the op amp usually needs 12V. When designing multiple outputs, there are many places and single output different. It is necessary to consider transformer pin limit, multi-side transformer design, voltage circuit implementation of each channel, and load adjustment for each light load and full load. Rate, as well as the cross regulation characteristics of the load. This article will detail the design of the multi-output module power supply through a design example of a 15W three-way module power supply that powers the microcontroller intelligent controller.
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