Hi,
I am working on the calibration of RX per SLUA731 (FOD GUI User's manual), section 6.3. and I came across some issue.
For my application, the battery we chose has 1000mA (1/LPP 503759) charging current and I selected source meter Keithley 2400.
To supply the constant current, what compliance voltage on the source meter should I use? and why?
I have tried using the max compliance voltage, and the chip got damaged; however if I use between 3v and 4v (fast charging state), the current reading on the source meter does not match the constant current that I set to, and Vout, Vrect, PPR, PPT always stay the same.
I found odd that, varies the compliance voltage and keep the same constant current will allow me collect some reasonable data, see below:
| Status | State | COMPL(V) | VRECT(V) | VOUT(V) | Current Reading on the source meter (A) | PPT(mW) | PPR(mW) | VFOD(V) | The constant current was set to 0.05A |
| Charging | Fast charging/Constant current | 3 | 3.58 | 3.34 | -0.756 | 3610 | 3476 | 0.607 | |
| 3.2 | 3.75 | 3.54 | -0.756 | 3726 | 3632 | 0.608 | |||
| 3.4 | 3.93 | 3.74 | -0.754 | 3906 | 3789 | 0.608 | |||
| 3.6 | 4.12 | 3.93 | -0.753 | 4068 | 4062 | 0.609 | |||
| 3.8 | 4.33 | 4.13 | -0.752 | 4241 | 4218 | 0.609 | |||
| Constant Voltage charging | 4 | 4.51 | 4.3 | -0.613 | 3520 | 3515 | 0.505 | ||
| 4.1 | 4.52 | 4.31 | -0.298 | 1681 | 1640 | 0.264 | |||
| Charged | Off | 4.2 | N/A | ||||||
Thank you
-Bo
