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ISO5852S-EP: DESAT Pin maximum input current

Part Number: ISO5852S-EP

Hello, 

What is the reason behind the fixed output current of 500uA on the DESAT pin?

I'm finding that 500uA is not sufficient forward current to create the voltage drop across a series of switching diodes needed to reduce the DESAT threshold.

Is there a maximum input current on this pin? 


Kind regards, 
Jack