![]() ![]() A good rule of thumb is to work the output not higher than 80% of the mentioned maximum ratings and drive the input with the least amount of current possible (e.g. If your circuit will be working at temperatures higher than 25 oC, just compensate. For example, in the datasheet I referred above, there is a section called Absolute Maximum Ratings oC As long as you never exceed these values, your circuit will not be stressed. As long as you keep both sides of the circuit working within safe limits. is used for the electrical isolation and filtering of 0.20 mA and 4.20 mA standard current signals without additional supply voltage. The opto-isolator can deal with differential voltages of up to 4000V. The 6.2 mm narrow passive loop-powered isolator MINI MCR-SL-.CP-I-I. At the output side, it can drive loads up to 70V. I came across while reading the opto-isolator technique used for electric isolation in embedded systems/ Integrated Circuits design that ' Opto-isolator is not recommended for electric isolation in power applications ICs mainly due to its dV/dt sensitivity'. You can easily find optocouplers that can handle currents as high as 2A with blocking voltages up to 600V.Ībout your second question, the answer is you shouldn't be concerned. A small, cheap (4), common optoisolator like the ILD205T comes in an SMD SOIC-8 package, contains two channels, require just 10mA (and can tolerate up to 100mA) to turn the embedded LED on at 6V. This one, for example, can handle up to 75mA at a maximum voltage of 60V. However, how suitable are these for your application depends very much on the current and voltage of the output circuit. These can be easily implemented with depletion mode MOSFETS. This kind of optoisolators are pretty common. ![]()
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