DCDC

Overview:

Ports: XT60 input, five outputs (four XT30, one USB)
Protection Circuit: ① Reverse connection protection circuit composed of PMOS, diodes, and resistors (as shown in the figure below)

                         ② TVS (Transient Voltage Suppressor) for surge voltage protection
                         ③ Fuse for overcurrent protection
                               
Output Switch Control: EN terminal connected to switch

                             ① When the switch is flipped to the floating pin, the enable pin is floating, the chip is in working state, and the subsequent output is normal.
                             ② When the switch is flipped to the GND pin, the enable pin is grounded, and the chip stops working.

Output Voltage: According to Vout=VSENSE*(1+R9/R10) (VSENSE=1.221V),

                        the required output voltage can be obtained by replacing the feedback resistors R9 and R10.
                              (Note: After changing the output voltage, some components in the circuit need to be reselected, such as: input and output capacitors, feedforward capacitors, TVS, etc.)
                             
Feedforward Capacitor: CF (C9) is selected as 15nF after calculation. Reasonable selection of the feedforward capacitor can improve the response speed.

Test Results:

Output Voltage: With feedback resistors of 10K and 3.24K respectively, the theoretical output is 5V, and the actual output is 4.98V~5.01V.
No-load ripple: 11~12mV.
Reverse Connection Protection Circuit: The subsequent stage shuts off when the input is reversed; verified to be usable.
Load Test: As the current increases, the output voltage drops. Under long-term load conditions, the voltage remains stable, and the temperature is normal. Efficiency varies with   

                        the output current, ranging from 70% to 82%. Load Ripple (output current 2.6A): 98mV.
Product:

Multi-output, power supply terminals can be soldered as needed (disadvantage: the board size will be large).
Input/output terminals and switches are horizontal, facilitating stacked board design.
Performance is relatively stable in actual use.