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opto isolated igbt driver

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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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