Tool/software:
Hi,
I have read the BQ25895 datasheet and it doesn't give any detail
on any peak current limit, neither does it give detail on
whether its in voltage mode or current mode, neither does it
tell of any slope compensation added. All it does is say that the charge current can be set by a microcontroller. This appears obviously to be an average current limit.
As such, this appears to give a large number of inductors which could do the job.
For us this is 5vin to 3V7 out at 5A.
Is there no way of finding out what is the peak current limit?
There must be one?
As you know, if its in current mode, then the slope compensation is related to the
downslope, so it would be helpful to know what is the added slope compensation, so that
we can work back to the inductor value required from that.
Why does it not give these details in the datasheet?
Page 50 of the BQ25895 datasheet says that an inductor should be chosen such that it gives 20-40% ripple current.
So if our charge current is 5A, then presumably that means ripple current peak can go up to 6A peak?. (because 2A is 40% of 5A).
