Hello TI Team,
For intrinsic safe applications, It was recommended to use 4 NTC on 4 series cells. ( one NTC for each cell, 4S cell so 4 NTC). Please find attached is the updated schematics.
I understand that the threshold values are calculated for RTS_Pullup 10K resistor and VTB =3V
As per datasheet..
|
|
|
Min |
Typ |
Max |
|
VOTC |
Threshold for 50°C based on a 10k |
29.15% |
29.38% |
31.45% |
|
|
Condition VTB =3V |
0.8745 |
0.8814 |
0.9435 |
I would like to use RTS_PU = 2.5K Ohms and 4 NTC in parallel gives me 1.06K Ohms i.e @50 °C.
If I calculate the V Threshold = (R2/(RTS_PU+R2))*VTB = [1.06K/(1.06K+2.5K)]*3V = 0.881356V, This threshold value cross the Min VOTC value.
With this my understanding is that temperature protection during charging will trigger at 50 °C.
Is my understanding correct?
Regards,
Ravi Kumar SutraiBMS review_TI.pdf
Senior Engineer (Electronics)
HBT Engineering Private Limited,
Olympia Tech Park, 7th Floor, Fortius Block,
Guindy,Chennai – 600032
Mobile: +91-9176849933
