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These figures show the Load Current (IL) - Load Voltage (VL) characteristics of the output MOSFET. When VL is low, the current changes in a near linear manner as the output MOSFET characteristics are similar to a resistor and there is no offset voltage. The other figures compare the SSR linear behavior to the transistor behavior of the optocoupler output. The SSR channel resistance is not polarized and works with positive and negative voltages. The optocoupler works very well in applications where bi-directional behavior is not required, such as in data circuits and feedback paths. The third figure shows the conduction characteristic of a Thyristor, or Triac. It will conduct only when triggered “on” and forward-biased. Loss of forward voltage causes the device to drop out of conduction while an adequate forward voltage as well as a trigger condition will cause it to conduct. The SSR is “on” as long as the control input is adequately driven since the output MOSFET switch does not care about polarity or magnitude of the load voltage within allowed limits. This behavior lends the SSR as a better option for small to medium AC or DC signals and loads.
PTM Published on: 2009-03-27