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SS6804DCSTR 数据表(PDF) 9 Page - Silicon Standard Corp.

部件名 SS6804DCSTR
功能描述  Three/Four-cell Lithium-Ion Battery Protection IC
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制造商  SSC [Silicon Standard Corp.]
网页  http://www.siliconstandard.com
标志 SSC - Silicon Standard Corp.

SS6804DCSTR 数据表(HTML) 9 Page - Silicon Standard Corp.

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SS6804
overcurrent detection levels (0.15V, 0.3V and
1.0V) and the three overcurrent delay time (TOI1,
TOI2
and
TOI3)
corresponding
to
each
overcurrent detection level. TOI1 is set by the
external capacitor CTI. TOI2 and TOI3 default to
4ms and 300
µs respectively, and can not be
adjusted due to protection of external MOSFETs
Cell-Balancing Bleeding after
Overcharge
When either of the battery cells is overcharged,
the
SS6804
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
(VOCR
or
VOCP-VHYS).
Connecting UD1, UD2, UD3 and UD4 pins to the
positive terminals of battery cells BAT1, BAT2,
BAT3 and BAT4 accomplish this function,
respectively. Inserting resistors along UD2 pin to
BAT2 positive terminal path and UD4 pin to
BAT4 positive terminal path can decrease the
bleeding current.
Power-Down after Overdischarge
When overdischarge occurs, the SS6804 will go
into power-down mode, turning off all the timing
generation and detection circuitry to reduce the
quiescent current to about 2.2
µA (VCC=9.2V). In
the unusual case where one battery cell is
overdischarged
while
another
one
under
overcharge condition, the SS6804 will turn off
all the detection circuitry except the overcharge
detection circuit for the cell under overcharge
condition.
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
SS6804
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
VCH).
DESIGN GUIDE
Cell Number Selection
The user must configure the SS6804 for three
or four series cells application. For three-cell
application, NSL pin should be connected
directly to VCC pin. For four-cell application,
NSL pin should be connected directly to GND
pin.
No. of Series Cells
NSL Pin
3-cell
Connected to VCC
4-cell
Connected to GND
The protection circuit for three-cell lithium-ion
battery pack is shown in application examples
Fig. 1.
Setting the Overcharge and
Overdischarge Delay Time
The overcharge delay time is set by the external
capacitor CTC and the overdischarge delay time
is set by the external capacitor CTD. The
relationship between capacitance of the external
capacitors and delay time is tabulated as below.
CTC ‚CTD(nF)
TOC ‚TOD(ms)
1
21
5
52
10
132
22
253
33
347
47
617
68
748
82
1004
100
1630
12/29/2003 Rev.2.02


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