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|Electromechanical switches use an electromagnetic coil to cause the mechanical actuation of DC and RF switch paths. Impellimax manufactures drivers specially suited to the requirements of these devices.
Many electromechanical switches require a high DC current, on the order of tens to hundreds of milliamps, to remain actuated. Additionally, each device has a specified “pull-in” voltage which must be exceeded in order to overcome the mechanical and electrical hysteresis in the system.
Impellimax fault-tolerant designs can withstand continuous hard short-circuits applied to their outputs, returning to normal operation once the short circuit is removed.
Drivers with high current capabilities are available, routinely sourcing or sinking 3 amperes per output. Internal clamping diodes absorb the inductive kickback without damage.
Impellimax fault-sensing drivers can provide a TTL level signal as built-in-test to identify short circuited loads, absent or open loads, and/or power supply droop beyond safe levels to maintain pull-in.
Some relays operate in a bistable mode, such that they only require a short pulse of high current (typically called a “Set” coil) in order to switch, and then they will remain in that position until a similar current pulse is applied to a different coil (typically called a “Reset” coil) to return to the original switch position. These latching designs use a special Impellimax driver which provides the properly sequenced and timed pulses to make latching relays operate under simple TTL control.
Appnote SD107 is currently undergoing revisions. Please contact the factory for your Relay Driver needs.
Output Buffered 1 of 8 Decoder, with kick protect diodes, for driving Relays and other High Current Loads