DC1899A-B

DC1899A-B demonstration circuit controls two independent power rail circuits each with Hot Swap™ and ideal diode functionality provided by LTC4228-2 dual ideal diode and Hot Swap controller. DC1899A facilitates evaluation of LTC4228 performance in different operation modes such as supply ramp-up, power supply switchover, steady state, and overcurrent faults. Each DC1899A circuit is assembled to operate with a 12V supply and 9A maximum current load. The board has LTC4228 controller, 2x MOSFETs operating as ideal diodes, 2x MOSFETs operating as Hot Swap devices, 2x current sense resistors, 2x jumpers for independently enabling each rail, 6x LEDs to indicate status, power good and fault conditions separately for each channel, and input voltage snubbers. There are pads for optional RC circuits for each Hot Swap MOSFET gate in order to adjust output voltage slew rate. In addition to this there are jumpers allowing monitoring of supply undervoltage conditions at either IN or SENSE+ pins.

• Board also has pads for a configuration with hot swap MOSFET located ahead of ideal diode MOSFET
• Power supply switchover mode can be realized as either an ideal diode or as a prioritize