Hi Sir,
Our customer's new notebook project uses 57W adapters (Vout=19V,Iout=3A) or 95W adapters (Vout=19V,Iout=5A) to supply power for the mainboard (i7-1165g7 cpus), but there was a problem that shutdown occurs when the Mainboard powered on and enter the operation system.
The charge IC register parameter setting is that the max charge voltage (0x15H) was set to 9.7V for 2-cell battery, and input current(0x3FH) default to 3.2A.
In order to find out the cause of the problem, we did the following tests:
1) Setting the charge voltage to 9.7V and input current default to 3.2A, the shutdown problem occurs again when using the 57W or 95W adapters.
2) Setting the charge voltage to 13V and input current default to 3.2A, we can also simulate the shutdown problem when enter the OS, and the input current measured by a multimeter will reach to 3.045A .
3) Setting the charge voltage to 13V and input current to 5A, we cannot simulate the shutdown problem when enter the OS (same 57W or 95W adapters) , and the input current measured by a multimeter will also reach to 3.045A .
4) Re-setting the charge voltage to 9.7V and input current to 5A, we can also simulate the shutdown problem when enter the OS (same 57W or 95W adapters) , and the input current measured by a multimeter will reach to 2.905A.
Through the previous three testing, we can understand that shutdown occurs when the input power does not reach the rate power of the CPU. But in the fourth testing, the input current is raised 5A and the Vsys voltage is changed to 9.7V for 2S battery, the shutdown problem anomaly still occurs.
Generally speaking, when the input current has increased to 5A, while the 95W adapter can also provide 5A output current, no shutdown should occurs. Can u help to analyze the cause of this problem?
Thanks,
Best Regards
