4
1 PRODUCT FUNCTION
1.2 Charging Algorithm
When the BCDC1220(-IGN) is turned on, it will move into the Boost stage. The
Boost stage maintains a constant current until the battery voltage reaches the
Absorption Voltage. The current during Boost stage may vary throughout operation
in order to maintain a safe operating temperature, or to limit the difference
between input and output voltages.
The charger will then move to Absorption stage which maintains a constant
voltage level for a predetermined period of time or until the current being drawn
by the output battery drops to less than 4A for 30 seconds; after which the charger
will enter Float stage.
Float stage maintains 13.3V
*1
on the output battery, keeping the battery topped
up. This counteracts the battery’s self discharging or loads applied to the battery.
When the battery loses charge, the charger will move back into the Boost stage.
1.3 Turn On/Off Thresholds
*1
12V
BCDC1220
12V
BCDC1220-IGN
24V
BCDC1220 &
BCDC1220-IGN
Input
Open Circuit Low
voltage conditions *
2
Turn ON above 13.2V 12.0V
with Ignition
Turn OFF below 12.7V 11.9V
with Ignition
Input
Loaded Low voltage
conditions*
3
Turn OFF
instantly below
8V
Turn OFF after
20 secs below
9V
Input
Over voltage shutdown
Turn ON below 32V
Turn OFF
instantly above
32.5V
Turn OFF after
20 secs above
32.1V
Output
Under voltage
shutdown
Shutdown if Output Battery < 4V
*1
Voltages Specified are ±100mV
*2
Tested every 100 Seconds.
*3
Constantly tested.
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