Hi all
Im trying to decied what would be the value of my precharge resistor.
on the EVM datasheet it explained as follow:
"
VCHG = Pack Charging voltage
Vgsth = Gate-Source threshold voltage of precharge MOSFET (Q7||Q27)
VF = Forward voltage drop of body diode of the discharge MOSFET
VBATT = Minimum battery voltage
IPRE = Desired precharge current
All of these values are determined by the user, based on the application. In this circuit, the following
values were assumed to get to the 1500-Ω precharge resistance.
VCHG = 16 × 4.2 V = 67.2 V
Vgsth = 2.4 V
VF = 0.8 V
VBATT = 16 × 2.0 V = 32 V
IPRE = 2200mA/100 = 22 mA
The RPRE is then calculated to be 1454 Ω. Two 3000-Ω resistors in parallel were chosen.
"
My question is why the Ipre is calculated: 2200mA/100.
I assume they ment Capacity/100, though I know (and so it refered in the system design guidlines) the the Ipre should be calculated as C/10 or C/20.
the default Ipre in the BQwizard is 240mA...
please,
can someone assist me with this question?
it preventing me from going into production,
thanks
