The demo board contains an optional third charge pump stage for applications requiring higher output voltages. The Board operates with a switching frequency of 400kHz and is designed to convert a 9V to 30V source to −250V, with 10mA output current. The DC2840A contains a selectable jumper, JP1, to aid in the selection of the desired Sync pin mode of operation. The default setting is a Burst Mode® operation. This layout is optimized for good EMI performance and small solution size. Input and output filters are necessary for CISPR 25 Class 5 emissions.