TYPEC input adjustable power supply

SC8903 buck-boost chip + fs312 fast charge decoy chip + INA199A2 current sensing amplifier + PW6206LDO + STC8G1K08A microcontroller.
Except for 8903, which is more expensive, other chips are about one yuan. The voltage can be adjusted between 3.1-20V, and the current can be between 0.4-5A. When adjusting the maximum 100W
output ripple at no load, it will be between 3-20mV depending on the output voltage, and the 4.5A output will not exceed 40mV.
The output efficiency of 16V5A is 93%.
The efficiency of 18V4.5A output is 94%.
The following two ripple diagrams are the ripples at 16V at no load and at 4.5A output.
The microcontroller model is STC81K08A. There must be an A suffix, otherwise there is no on-chip ADC. Download When burning the microcontroller program, select 24MHZ as the frequency of
the microcontroller, connect the TX of the downloader to the RX on the board, and the RX to the TX on the board; first connect the three wires GND TX RX, click Download Program on STC-ISP and then plug in the VCC
potential The resistance of the device may be quite different. Adjusting the output voltage may exceed 22V, which will trigger the overvoltage protection of the chip. When adjusting, be careful not to twist it all the way.
It can adjust the current and has a constant current function, but do not short-circuit it directly. The current inside the SC8903 The charging head that pulls
the front stage of the amplifier should try to use a fast charging head that supports 100WPD. If the overpower is insufficient, be careful not to exceed the power of the charging head when using it, otherwise the over-current protection of the charging head may be triggered.