Adjustable Power Supply V3.0 Based on XL6019 and XL4015 (Upper Part) _ Open Source _ 240331

Preface
        This project learned from the lessons of the previous radical approach (see "240118_Adjustable Power Supply V2.0 Based on XL6019 and XL4015"), and temporarily changed all board-to-board connections to pin headers and female headers (theoretically, a single pin header can handle a maximum current of 3A).
(PS: This is only the first half of the entire project, mainly providing a design concept for a CNC power supply stack. Please modify some dimensions and parameters as needed.)
(PPS: The thing on the right in the image below is the first version: "240131_Adjustable Power Supply V1.0 Based on XL6019 and XL4015_Open Source")
 
Regarding the boost/buck boards:
I. XL6019 boost board
         : BOOST boost, with a boost upper limit of +24V, and can output 5A for a short time in actual tests (prolonged high-power output will cause severe heat generation).
II. XL4015 buck board
         : BUCK buck, with a buck lower limit of +1.25V, and can output 5A for a short time in actual tests.
        Note: The side with the M3 hole on the board is the power input side, default +12.4V.
Regarding the power distribution board:
1. The voltage detection circuit based on LM358
        consists of a resistor divider circuit and a voltage follower composed of LM358. To prevent the output from exceeding 3.3V and electrostatic discharge (ESD) breakdown, a 1N4148WS diode and a PESD3V3L1BA ESD protection device are added.
2. The current detection circuit based on TP2412
       consists of a sampling resistor (low side, 20mΩ) and a differential amplifier circuit composed of TP2412. To prevent the output from exceeding 3.3V and ESD breakdown, the external circuitry is the same as above.
       (I_V = (12/(1+1))*0.02*output current I+1.27V).
3. Power distribution port
        3.81 terminal block, four outputs on one side, a total of 8 power distribution ports.
Regarding the power protection section
: 1. The battery is connected to
       the XT60PW battery interface. A window is opened at the top of the circuit board for easy connection of other power sources.
II. Power Input Protection
         : Surge Protection: TVS (Transient Voltage Suppressor) diode 1.5SMC30CAHE3/57T.
         Reverse Connection Protection: WSD80120DN56 high-power NMOS transistor (this model is not mandatory; select according to power requirements; the same applies to PMOS transistors).
         Soft Start/Reverse Connection Protection: WSD90P06DN56 high-power PMOS transistor, paired with a PNP transistor FMMT593 and its peripheral circuitry to form a soft start circuit to prevent excessive instantaneous power.
        Note: The default power input is +12.4V.