opto isolated igbt driver - Electronic Circuits Projects Diagrams Free

finch661 · 7th January 2008, 11:34 PM

i am constructing an igbt driver using this part http://www.farnell.com/datasheets/86257.pdf
in the schematic, it uses an opto isolator. i have got the basic circuit to work (by grounding the in pin grounds the output voltage). i have also got an opto isolator to work (by passing a 10khz signal through it), but when i integrate the 2 systems nothing works... sigh! any ideas?

ronsimpson · 8th January 2008, 01:10 AM

The input should be below 0.8 volts for a low. The opto may not be able to pull the input that low.

The pullup resistor should pull up to 4.2 volts with a 1uA load.

So the question is; what is the high and low voltage on the input.

Do not pull more than 10mA from the reference voltage.

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7th January 2008, 11:34 PM	(permalink)
finch661	opto isolated igbt driver i am constructing an igbt driver using this part http://www.farnell.com/datasheets/86257.pdf in the schematic, it uses an opto isolator. i have got the basic circuit to work (by grounding the in pin grounds the output voltage). i have also got an opto isolator to work (by passing a 10khz signal through it), but when i integrate the 2 systems nothing works... sigh! any ideas?

8th January 2008, 01:10 AM	(permalink)
ronsimpson	The input should be below 0.8 volts for a low. The opto may not be able to pull the input that low. The pullup resistor should pull up to 4.2 volts with a 1uA load. So the question is; what is the high and low voltage on the input. Do not pull more than 10mA from the reference voltage.