Engineers have a few design options in low-voltage systems when several high current loads need to be controlled. The first option is the make versus buy decision. Then, should the loads be controlled by relays or solid state power switches? If the make choice is made, several more options need to be considered. For controlling four to six 15A loads, a flexible ready-made solution may simplify the choices.
StacoSwitch's High Power Switching Module (PSM) contains most of the power control elements for handling up to six 15A loads in a 88.9-mm (3.5-inch) x 127-mm (5-inch) board. Designed for the requirements of marine industry applications, the unit is powered by 6 to 28V and available with either four or six power MOSFETs with heatsinks to handle up to 15A. The total current to all power switches is limited to 30A.
A DIP switch allows each channel to independently have either momentary or true on/off action. LED dimming controls allow light intensity adjustment for backlighting (green) and switch status (red) indicators. Each switch has an output shutdown at 21A and a standard 30A automotive-type fuse protects the board. With the S option, boards can be stacked to reduce wiring, but the total stack current is still limited to 30A. The use of the keypad interface or other low-current switch inputs allows the module to be mounted behind a panel.
Potential applications for the PSM module in the automotive industry include van conversions, emergency vehicles, toy haulers, specialty vehicles, motor homes, heavy equipment and off-road vehicles. In the aviation industry, applications include cabin lights, cargo area, lavatories and experimental aircraft.
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 Design for operation from -40C to +70C, the PSM4000S version of StacoSwitch's High Power Switching Module has four power MOSFET switches with all the necessary control circuitry on board. |
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