1 PRODUCT FUNCTION
The BCDC1220 is a multi stage, 12V, 20A, DC-DC battery charger that operates from an
input of either 12V or 24V nominal. The input voltage of the BCDC1220 can be above,
below or equal to the output voltage making it ideal for charging from a 24V vehicle or
charging an auxiliary 12V battery where the distance from the main battery may cause a
signifi cant voltage drop.
1.1 Operation
When the BCDC1220 is turned on, it will move into the bulk charging stage called
Boost stage. Boost stage maintains a constant current until the battery voltage
reaches its set point. The current in Boost stage may vary during operation in
order to maintain safe operating temperature.
The charger will then move to Absorption stage. This stage maintains a constant
voltage level for a predetermined period of time or until the current being drawn
by the output drops to less than 4A for 30 seconds; after which the charger will
enter Float stage.
Float stage maintains 13.3V on the output battery, keeping the battery topped up.
This counteracts the battery’s self discharging. When a load applied to the battery
causes it to lose charge, the charger will move back into Boost.
1.2 Turn On/Off Thresholds
12V 24V
Low voltage conditions (open
circuit, tested every 100s)
Turn ON above 13.2V Turn ON with Ignition
Turn OFF below 12.7V Turn OFF with Ignition
Low voltage conditions (loaded,
constantly tested)
Turn OFF instantly below
8V
Turn OFF instantly below
8V
Turn OFF after 20 secs
below 9V
Turn OFF after 20 secs
below 9V
Over voltage shutdown Turn ON below 32V Turn ON below 32V
Turn OFF instantly above
32.5V
Turn OFF instantly above
32.5V
Turn OFF after 20 secs
above 32.1V
Turn OFF after 20 secs
above 32.1V
Under voltage shutdown Shutdown if Output Battery < 4V
3
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