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參數(shù)資料
| 型號(hào)： | AIC1803 |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Three-Cell Lithium-Ion Battery Protection IC |
| 中文描述： | 三節(jié)鋰離子電池保護(hù)IC |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 161K |
| 代理商： | AIC1803 |
AIC1803
9
beyond the overdischarge delay time (T
OD
) period,
discharging is inhibited by the turning-off of the
discharge
control
MOSFET
overdischarge delay time is set by the external
capacitor
C
TD.
Inhibition
immediately released when the voltage of the
overdischarge cell becomes higher than the
overdischarge release voltage (V
ODR
) through
charging.
M1.
The
of
discharging
is
Overcurrent Protection
In normal
mode,
monitors the discharge current by sensing the
voltage of CS pin. If the voltage V
CC
-V
CS
exceeds
the overcurrent protection voltage (V
OIP
) beyond
the overcurrent delay time (T
OI
)
period, the
overcurrent
protection
discharging is inhibited by the turning-off of the
discharge control MOSFET M1. Discharging must
be inhibited for at least 256mS after overcurrent
takes place to avoid damage to external control
MOSFETs due to rapidly switching transient
between BATT+ and BATT- terminals. The
overcurrent condition returns to normal mode
when the load is released and the impedance
between the BATT+ and BATT- terminals is
20M
or higher.
the
AIC1803
continuously
circuit
operates
and
The AIC1803 is provided with the three
overcurrent detection levels (0.15V, 0.3V and
1.0V) and the three overcurrent delay time (T
OI1
,
T
OI2
and T
OI3
) corresponding to each overcurrent
detection level. T
OI1
is set by the external capacitor
C
TI
. T
OI2
and T
OI3
default to 4mS and 300
μ
s
respectively, and can not be adjusted due to
protection of external MOSFETs
Cell-Balancing
Overcharge
When either of the battery cells is overcharged,
the AIC1803 provides the cell-balancing bleeding
function to discharge the overcharged cell at
about 9mA until the voltage of the overcharged
cell decreases to overcharge release voltage
Bleeding
after
(V
OCR
or V
OCP
-v
HYS
). This function is accomplished
by connecting UD1, UD2, UD3 pins to the positive
terminals of battery cells BAT1, BAT2, BAT3
respectively. The bleeding current can be
decreased by inserting resistors along UD1 pin to
BAT1 positive terminal path and UD3 pin to BAT3
positive terminal path.
Power-Down after Overdischarge
When overdischarge occurs, the AIC1803 will go
into power-down mode, turning off all the timing
generation and detection circuitry to reduce the
quiescent current to about 1.3
μ
A (V
CC
=6.9V). In
the unusual case where one battery cell is
overdischarged
while
overcharge condition, the AIC1803 will turn off all
the detection circuitry except the overcharge
detection circuit for the cell under overcharge
condition.
another
one
under
Charge Detection after Overdischarge
When overdischarge occurs, the discharge control
MOSFET M1 turns off and discharging is inhibited.
However, charging is still permitted through the
parasitic diode of M1. Once the charger is
connected to the battery pack, the AIC1803
immediately turns on all the timing generation and
detection circuitry and goes into normal mode.
Charging is determined to be in progress if the CS
pin voltage is higher than VCC + 0.4V (charge
detection threshold voltage V
CH
).
·
DESIGN GUIDE
Setting
Overdischarge Delay Time
The overcharge delay time is set by the external
capacitor C
TC
and the overdischarge delay time is
set by the external capacitor C
TD.
The relationship
between capacitance of the external capacitors
and delay time is tabulated as below.
the
Overcharge
and
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