optocouple suggestion?

[qwertyqwq]

salut a tout !

I'm looking for a optocoupler ,which can turn on and turn of about 30kHz . There will be a mosfet at its output. Opto's supply voltage will around 12-24V. Also switching signal is from opamp's output, so signal current will be low. Any suggestion please ???

 

[qwertyqwq]

Is this suitable for my project?

 

[unclejed613]

yes, switching time is 0.5uS which would be usable up to about 500khz

 

[crutschow]

That MOSFET has a large gate input capacitance of 12,000pF and requires the transfer of 236nC of charge to turn it on and off, so you will need a low-impedance gate driver at the output of the opto to operate at 30kHz.
For example,, to achieve a rise/fall time of 1us will require a driver that can source and sink 230mA of current during that transition time.

 

[qwertyqwq]

That MOSFET has a large gate input capacitance of 12,000pF and requires the transfer of 236nC of charge to turn it on and off, so you will need a low-impedance gate driver at the output of the opto to operate at 30kHz.
For example,, to achieve a rise/fall time of 1us will require a driver that can source and sink 230mA of current during that transition time.

Hmm.
What about a mosfet driver like a ir2110 for output of the optocoupler ?

 

[crutschow]

What about a mosfet driver like a ir2110 for output of the optocoupler ?

That should work, but it is both a high-side and low-side driver.
You might be able to find a cheaper low-side only driver.

 

[qwertyqwq]

That should work, but it is both a high-side and low-side driver.
You might be able to find a cheaper low-side only driver.

Ahh okey. Bipolar/Mosfet totem pole will solve my problem then. Thanks a lot.

 

[ChrisP58]

You had originally asked for an optocoupler.

Here is one with a 2.5 Amp mosfet drive output current. Frequency is spec'd to 250 kHz.
https://www.mouser.com/datasheet/2/408/TLP152_datasheet_en_20171219-1133756.pdf