DC783A

DC783A demonstration circuit is a complete fast battery charger capable of charging 1, 2, 3 or 4 series connected NiMH or NiCd cells. Charge termination includes -∆V, peak voltage and a safety timer. Included on the board are jumpers to select NTC thermistor functions, battery chemistry, number of series cells, safety timer length, recharge voltage and two LEDs to indicate charger status. A power path FET is also included that provides a low-loss path between the battery and an external system load when the input power is removed. Terminals are included for PAUSE and SHUTDOWN. The power portion of the circuit consists of a PNP power transistor constant current source which can provide up to 2A of charge current under some conditions. Jumpers are provided for programming charge currents of 0.5A, 1A or 2A. Other charge currents can be programmed by adding an external resistor to the “PROG” terminal post.

• Included on this board is a power path MOSFET