SC8802 buck-boost verification board

The SC8802-based bidirectional buck-boost scheme verification board
 
project introduces
a functional verification board for the SC8802 buck-boost chip to realize the buck-boost function of the SC8802 scheme.
 
This solution does not use wiring that fully complies with DCDC standards for a symmetrical appearance. It only guarantees that basic functions can be completed, and does not guarantee performance such as ripple size and EMI.
 
During board testing, the pull-up resistor for the current PWM signal forgot to drill holes. This problem has been fixed in this open source drawing.
The output voltage of the battery terminal is determined by the battery voltage setting resistor and the FB feedback voltage divider, which is different from the output voltage of the power supply terminal purely determined by the FB resistor.
In the extreme test boost mode, the input current can reach 17A. At this current, the MOS and inductor temperatures have exceeded 100, so it cannot be used for a long time. The current carrying capacity after enhanced heat dissipation has not been tested yet. I personally feel that this has reached the limit.
During the limit test, the 0.01 ohm current sensing resistor generates a lot of heat. If possible, the 0.005 ohm current sensing resistor and the series resistance test of the corresponding value on the detection line can be replaced.
 
 
Note:
If you want to start this verification board when the battery terminal is powered, you need to fly-solder a diode between the chip dir pin and the battery terminal to provide power to the chip in the initial state.
The BOM has not been verified yet, and there is no guarantee that the original will be able to be used! !
This project is imported from AD, there may be a problem that it cannot be printed for free! !
The SC8802 solution consumes a lot of standby power when it is turned on. It is not recommended to be used alone in situations where the output cannot be turned off (such as mobile power supplies. All mobile power supplies using this solution have microcontroller control chip switches)
 
 
. Photos of the extreme test. You can see
 
 
other pictures of the diode flash soldered for startup in the picture.