xr2981

I drew this board very big because some things I drew before were too compact and not easy to solder. Then the information I found said that the power of this chip can reach 24W. Drawing it bigger will also help with heat dissipation (although its limit is I haven't tested the performance either), and then said that it has a built-in 6A mos tube. It also has over-current protection. When the input current is too large, the output voltage approaches the input voltage. Regarding the setting of the output voltage, the formula is Vout=VFB*(R3+R2)/R2, VFB=1.24V, just adjust R3. My layout may not be very good. The specific drawing method is to directly pull the wires for small currents and directly lay copper for large currents. Please do not use the BOM exported by Lichuang. Please strictly follow the schematic diagram. There are some differences between the pcb and the schematic diagram, mainly in As for the input and output capacitors, this is optional.