DCDC 7-24V to 5V 3Amax DC step-down module

Input voltage: 7V~28V (The working voltage of this power supply IC according to the official manual is 4.5V~28V, but the output is fixed at 5V, so a voltage drop of at least 2V is required to be more stable. In addition, critical voltage input is not recommended) Output voltage: 5V ±0.3V ( After welding three pieces, the maximum error output is 5.3V. You can change the R6 resistance appropriately for fine-tuning) Output current: 3A (maximum) Conversion efficiency: 96% (maximum) Output ripple: <30mV Switching frequency: 1.5MHz ( Maximum), typical 1MHz operating temperature: -45℃~+85℃.
 
This board is mainly to verify the feasibility of the solution. It is a design reference for the embedded development board to verify the work
of another open source with an adjustable output voltage range of 0.8V~20V. Project:
MP1584EN (DC-DC adjustable buck module) - Jialichuang EDA open source hardware platform (oshwhub.com)
modified the circuit layout with reference to the official design manual (referenced but not fully referenced), added switches and used the XT30 interface. The input and lead-out pins can be directly used for testing, using
 
the actual board welded. The test access switching power supply outputs 24V. The reason why the output is fixed at 5V is to power devices such as servos. If the 3A current is enough to drive it,
it can be connected separately. LDO to 3V3 (for example, attaching an AMS1117), this way not only ensures the working voltage of control devices such as microcontrollers, but also maintains the 5V output capability.
The inductor I bought is larger in size, and it can be used after soldering, but the pin header is stuck. For normal effects, refer to the 3D diagram (of course you can also solder the switch XT30 and the pin header to the back).
 
In addition, the output pin header is a bit close. To be on the safe side, you can add respective recovery fuses to limit the short-circuit current. When testing, use a test pen to connect the 5V and If the GND is short-circuited, the IC will explode directly.
However, there will be no sparks when it explodes. The IC will just crack. There may be some protection inside, probably (subsequent improvement, but it is probably integrated into a new board.
Input and output test: