Optocoupler combined with gate driver. cannot get output!

Thread Starter

hidayah15

Joined Mar 13, 2016
6
im doing a final year project.
im using optocoupler 6n137 and gate driver fan7382
it works okay on its own however when i connect the output of the optocoupler to my input fan7382, it does not give any output at the high out and low out. any advices??

6n137.jpg fan7382.jpg
 

Thread Starter

hidayah15

Joined Mar 13, 2016
6
What voltages are you seeing at input pins 2 and 3 of the 7382?
output from collector transistor.jpg
the yellow waveform is the input at the optocoupler
the blue waveform is the waveform at the transistor collector. i connected the collector output to the pin 2 and pin 3 separately to get the separate waveform for the lowout and highout. below are the 2 waveforms.
output lowout at driver side.jpg
the blue waveform output lowout at driver side
output highout from driver side.jpg
the blue waveform is the output highout from the driver side
 

Alec_t

Joined Sep 17, 2013
10,918
What voltage do you get at pin 6 of the 6N137?
Is pin 5 of the 6N137 properly grounded?
Try increasing RL to at least 1kΩ.
 
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