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SS6802AGSTR Datasheet(PDF) 9 Page - Silicon Standard Corp.

No. de pieza SS6802AGSTR
Descripción Electrónicos  TWO-CELL LITHIUM-ION BATTERY PROTECTION IC
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Fabricante Electrónico  SSC [Silicon Standard Corp.]
Página de inicio  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6802AGSTR Datasheet(HTML) 9 Page - Silicon Standard Corp.

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02/26/2008 Rev.1.00
www.SiliconStandard.com
9
overcurrent
threshold
current
will
change
accordingly.
Suppressing the Ripple and Disturbance
from Charger
To suppress the ripple and disturbance from
charger, connecting C1 to cell 1 and C2 to cell 2
is necessary.
Controlling the Charge Control
MOSFET
R3, R4, R5 and NPN transistor Q1 are used to
switch the charge control MOSFET M2. If
overcharge does not occur, no current flows out
from OC pin and Q1 are turned off, then M2 is
turned on. When overcharge occurs, current
flows out from OC pin and Q1 is turned on, which
turns off M2 in turn. High resistance for R3, R4,
and R5 is recommended for reducing loading of
the batteries.
Latch-Up Protection at CS Pin
R6 is used for latch-up protection when charger
is connected under overdischarge condition, and
also for overstress protection when charger is
connected in reverse. The charge detection
function after overdischarge is possibly disabled
by larger value of R6. Resistance of 1K
Ω is
recommended.
Selection of R1 and R 2
R1 and R2 are used to avoid large current flow
through the battery pack under the situation of IC
damage or pin short. On the other hand,
resistance of R1 and R2 will affect overcharge
release voltage and bleeding function. The
relationship among Vrelease1,Vrelease2, R1,
and R2 is shown as following equations:
Vrelease1=VOCR+IUD*R1
Vrelease2=VOCR+IUD*R2
where
Vrelease1 is Battery 1, real overcharge release
voltage
Vrelease2 is Battery 2, real overcharge release
voltage
Therefore, resistance of R1 and R2 should not
higher than 30
Ω. Otherwise, overcharge release
voltage
would
be
higher
than
overcharge
protection voltage and the charging current may
oscillate. In addition, if overcharge protection
function occurs, SS6802 will discharge the
overcharged cell and will stop bleeding function
even if the voltage is not equal to the other. The
recommended resistance of R1 and R2 is from
20 to 30
Ω.
Effect of C3
C3 has to be applied to the circuit. Because C3
will
keep
SS6802
to
be
charged
after
overdischarge occurred. In addition, when the
differential voltage between charger and battery
pack
is
higher
than
2.1V
and
overcharge
protection function work, C3 will avoid battery
pack from being charged even if the battery
voltage lower than 4V (To avoid battery pack from
being
charged
under
charger
malfunction
situation). The battery pack can be charged again
till remove it from charger.
SS6802


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