M
michael nikolaou
- Jan 1, 1970
- 0
Hi to newsgroup
I want to use one optocoupler type LTV-8x6 from LITE-ON as a simple switch .
Output transistor drives one 4.7 K load @ 3,3V and directly to a mcu pin.
Input led is biased from 12 or 24 volts. As i see i can use a resistor to
bias the led at 12 volt and have double current at 24 volts . I imagine 6 ma
for 12 volt is ok . This calculates to 12 ma for 24 volts with the same
resistor.My question is after 10 years of operation if the led deteriorates
is the current sufficient ?. Do i need absolutely a reverse polarity diode
for the led?. Finally what is the simplest configuration in the input led
circuit so it can be driven with active low or active high signals . The
thing is i need an array of 4 optocouplers and only one common input per
opto for both types of logic .
Any help would be appreciated .
I want to use one optocoupler type LTV-8x6 from LITE-ON as a simple switch .
Output transistor drives one 4.7 K load @ 3,3V and directly to a mcu pin.
Input led is biased from 12 or 24 volts. As i see i can use a resistor to
bias the led at 12 volt and have double current at 24 volts . I imagine 6 ma
for 12 volt is ok . This calculates to 12 ma for 24 volts with the same
resistor.My question is after 10 years of operation if the led deteriorates
is the current sufficient ?. Do i need absolutely a reverse polarity diode
for the led?. Finally what is the simplest configuration in the input led
circuit so it can be driven with active low or active high signals . The
thing is i need an array of 4 optocouplers and only one common input per
opto for both types of logic .
Any help would be appreciated .
