Datasheet

0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
100
1000
10000
I -
SET
W
I -OutputCurrent- A
O
I InternalClampRange
OUT
I Short
Fault
Range
SET
NonRestricted
Operating Area
I Programmed
OUT
min
max
I Clampmin-max
OUT
I Faultmin-max
OUT
bq24050
bq24052
bq24055
SLUS940B –SEPTEMBER 2009–REVISED JUNE 2012 www.ti.com
Figure 27. PROGRAMMED / CLAMPED OUT CURRENT
PRE_TERM – Pre-Charge and Termination Programmable Threshold
Pre-Term is used to program both the pre-charge current and the termination current threshold, on the
bq24050/2/5. The pre-charge current level is a factor of two higher than the termination current level. The
termination can be set between 5 and 50% of the programmed output current level set by ISET. If left floating the
termination and pre-charge are set internally at 10/20% respectively. The pre-charge-to-fast-charge, V
lowv
threshold is set to 2.5V.
R
PRE-TERM
= %Term × K
TERM
= %Pre-CHG × K
PRE-CHG
(0)
Where:
%Term is the percent of fast charge current where termination occurs;
%Pre-CHG is the percent of fast charge current that is desired during precharge;
K
TERM
and KPRE-CHG are gain factors found in the electrical specifications.
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