Optocoupler - emitter pull down

Thread Starter

Arne Spiessens

Joined Nov 8, 2016
17
Hello,

I want to use this optocoupler ILD205 ( https://www.vishay.com/docs/83647/ild205t.pdf ) for driving a PROFET (MOSFET basically) from a microcontroller MCU1.1
The output will now always be inverted, which I don't want. I can revert it with a logic CMOS inverter, but I want to avoid extra components.
Can I use a pull down resistor from the emitter to GND and no pull up resistor?
I know a lot of optocouplers are not designed for this, but the ILD205 seems to be alright with it?


Kind regards
 
Last edited:

bertus

Joined Apr 5, 2008
20,102
Hello,

What is the box with the P$ pins in it?
You can exchange the R5 and opto-output, but it will effect the timing, as you will have R5 parallel with C9.

Bertus
 

Thread Starter

Arne Spiessens

Joined Nov 8, 2016
17
Hello,

Why do you have C9 in the circuit?
Do you want a delay on switch off (when the opto opens)?

Bertus
I will not use this circuit for fast switching, the PROFET should turn on and stay on for hours. So It's not bad I think to make the circuit a bit slower reacting I believe
 
Top