1300W PSU - Help with replacement mosfet

[sdinelli]

Re: 1300W PSU - Help with replacement mosfet

anyone?

[lotas]

Re: 1300W PSU - Help with replacement mosfet

Analogue table 817:

[momaka]

Re: 1300W PSU - Help with replacement mosfet

Im looking to replace all 3 optos since theyre only $.50 and testing seems to be a pain.

part number on chip is in fact B1745 817B
Looking these up on digkey, im trying to filter out but not sure what value i need on the "Voltage - Output (Max)" options are 35V, 70V, and 80V.

Can someone please recommend a replacement chip or acceptable voltage.

Replying a little later here... but better than never??

The output voltage mentioned above is just how much the transistor on the output of the optocoupler can handle (typically equivalent to V_ceo). So going with a higher value won't hurt. In fact, since you don't know what voltage the opto is handling, might as well go with the higher voltages... though in reality, these opto's usually have to handle 20V or less on the output, so probably even the 35V part would do okay.