Using STM32F072 to regulate the pocket experimental power supply of TX4211 and SY6345

This pocket experimental power supply I designed and made is a step-up type. One of the goals is to be small and easy to use without taking up space. The input voltage supports a range of 3.2V~5.5V (both lithium iron phosphate batteries and USB power supply can be used). It is only for low-power testing and applications. The initial design output voltage is up to 20V, providing a minimum output capacity of 100mA (if you want a large current, design it separately), and a TX4211 is used to achieve step-up conversion. The second design goal is digital control - instead of using a potentiometer, the output voltage is controlled by an MCU. I used the DAC of the STM32F072 to achieve this. Because digital control is used, synchronous regulation can be performed, so I added a linear low-dropout regulator composed of SY6345 after the DC-DC boost to reduce the output ripple of the switching power supply and improve the load response capability. Editor's note: The author's three thousand words of detailed explanation can be found in the forum post: https://bbs.eeworld.com.cn/thread-1300018-1-1.html