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SS6781BGSTB Fiches technique(PDF) 10 Page - Silicon Standard Corp.

No de pièce SS6781BGSTB
Description  Battery Charge Controller
Download  20 Pages
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Fabricant  SSC [Silicon Standard Corp.]
Site Internet  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6781BGSTB Fiches technique(HTML) 10 Page - Silicon Standard Corp.

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01/31/2008 Rev.1.00
www.SiliconStandard.com
10
SS6781B
APPLICATION INFORMATIONS
THE SS6781B OPERATION
Power-on and Battery Pre-qualifying
When power is first applied to the
SS6781B, all
internal digital circuit blocks of the
SS6781B are
reset by the internal power-on-reset circuitry and
output LEDs (depending on the setting of SEL1 and
SEL2 pins) flash 3 times to indicate the initiation of
power-on. The internal control unit then examines
the battery condition through the VBT and VTS
pins.
The acceptable limits of VBT pin is determined by
the input voltage of SEL3 pin and the acceptable
temperature sense voltage window for VTS pin is
0.29 VCC to 0.72 VCC. If the voltage of VBT pin fails
to fall within the predetermined acceptable limits,
the
SS6781B enters a charge-suspending mode, in
which all the internal circuitry remains in reset state.
If the voltage of VTS pin is outside the 0.29 VCC to
0.72 VCC window, action of
SS6781B is determined
by the input voltage of SEL3 pin.
Discharge-Before-Charge
The
SS6781B
provides
the
function
of
discharge-before-charge
to
precondition
NiCd
batteries which suffer from memory effect. This
function
can
only
be
activated
after
the
pre-qualification of battery voltage and temperature,
yet before the charge completion is registered for
the fast charge cycle.
To trigger this function, DSW pin has to be biased
to GND for over 0.18 second. After discharge
begins, LED1 and LED2 pins are both off, ICON
pin is on, and DIS pin goes high to activate an
external circuit to discharge the battery until the
voltage of VBT pin falls below 0.9V (or 0.69V,
depending on the input voltage of SEL3 pin) or
DSW pin is biased to GND for over 0.18 second
again. Fast charge will automatically start after
discharge is finished. The application circuit is
included in TYPICAL APPLICATION CIRCUIT.
Fast Charge
After the battery passes fault checks and required
discharging of the battery is completed, fast
charging begins while initial timer and safety timer
of the
SS6781B start counting. Functions of -∆V
detection, peak voltage timer,
detection,
and
maximum
battery
voltage
are,
however,
disabled temporarily until the initial timer period in
the initial stage of a charge cycle elapses. The
initial timer period is equal to 1/80 of safety timer.
t
T/
Since the low limit of acceptable VBT voltage is
only about 0.16V during the initial timer period,
even deeply discharged batteries can easily qualify
to be fast charged subsequently.
In the course of fast charge, the
SS6781B
constantly monitors the voltages at VBT and VTS
pins. The fast charge process is switched to trickle
charge when any one of the following situations is
encountered, which are explained below:
Negative delta voltage (-
∆V)
Peak voltage timer (0
)
V
Delta temperature/ delta time (
∆T/∆t)
Maximum charge time
Maximum battery voltage
Maximum battery temperature
-
∆V Cutoff
The
SS6781B makes a voltage sampling at VBT
pin every 4 seconds when safety timer period is set
equal to 80 minutes. If a negative delta voltage of
0.25% compared to its peak value is detected at
VBT pin, the fast charge cycle is terminated.
0
∆V Cutoff
If the battery voltage stays at its peak value or
decreases very slowly for the duration determined
by the peak voltage timer, which is in turn


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