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參數資料
| 型號： | AIC1802CCS |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Two-Cell Lithium-Ion Battery Protection IC |
| 中文描述： | 雙鋰離子電池保護IC |
| 文件頁數： | 8/10頁 |
| 文件大?。?/td> | 132K |
| 代理商： | AIC1802CCS |
AIC1802
8
time T
OI
is tabulated as below.
V
CS
(V)
T
OI
(S)
150m
9.0m
200m
5.6m
300m
2.8m
360m
2.0m
1V
540
μ
3V
290
μ
5V
270
μ
Unbalanced Discharge after Overcharge
When either of the battery cells is overcharged,
the AIC1802 will automatically discharge the
overcharged cell at about 7.7mA until the voltage
of the overcharged cell is equal to the voltage of
the other cell. If the voltage of the other cell is
below V
OCR
, the internal cell-balance “bleeding”
will proceed until the voltage of the overcharged
cell decreases to V
OCR
.
DESIGN GUIDE
Adjustment
Overdischarge Delay Time
Both the overcharge and overdischarge delay
times default to 25mS and can be extended by
of
Overcharge
and
adding the external capacitors C
TC
and C
TD
,
respectively. Increasing the capacitance value will
increase the delay time. The relationship between
capacitance of the external capacitors and delay
time is tabulated as below:
C
TC
(F)
T
OC
(S)
0
μ
25m
0.1
μ
320m
0.3
μ
890m
0.47
μ
1.12
0.57
μ
1.43
C
TD
(F)
T
OD
(S)
0
μ
25m
0.1
μ
320m
0.3
μ
820m
0.47
μ
1.08
0.57
μ
1.39
Selection of External Control MOSFETs
Because the overcurrent protection voltage is
preset, the threshold current for overcurrent
detection is determined by the turn-on resistance
of the discharge control MOSFET M1. The turn-
on resistance of the external control MOSFETs
can be determined by the equation: R
ON
=V
OIP
/I
T
(I
T
is the overcurrent threshold current). For
example, if the overcurrent threshold current I
T
is
designed to be 5A, the turn-on resistance of the
external control MOSFETs must be 30m
. Users
should be aware that turn-on resistance of the
MOSFET changes with temperature variation due
to heat dissipation. It changes with the voltage
between gate and source as well. (Turn-on
resistance of a MOSFET increases as the voltage
between gate and source decreases). Once the
turn-on resistance of the external MOSFET
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