Friday, September 3, 2010

More on Opto-couplers

Opto-couplers are optically isolated devices. They come in handy when systems of different voltage levels have to be coupled together, and when controlling noisy inputs or outputs. They are often used to provide system isolation, or as a remote system control.

 
Specific applications include
  • high-end instrumentation
  • lab equipment
  • linear regulators
  • high voltage switches.

 
The idea is pretty straightforward – forward current through LEDs generate smaller leakage current in a photo-diode. The leakage current is linear, and can be monitored and controlled.

 
VMI manufactures several styles of opto-couplers in several breakdown voltages.

 
• The OC025 features the lowest breakdown voltage, and also, not coincidently, has the smallest foot print (approximately .46” x .46” x .33”, (11.7 x 11.7 x 8.3mm), excluding leads.

 
• The OC100 family has a Vrwm of 10kV to 15kV, depending on the selected product. Dimensions are approximately .45” x 1.0” x .32” (11.4 x 25.4 x 8.1mm), excluding leads.

 
• The OC250 has a Vrwm of 25kV, and comes in the largest package, measuring 1.4” x 2.1” x 1.0”

 
For more info on applications, visit our website.

 

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