Some of these curves are already defined to IF at range of 10-16mA, but increasing the supply from a factor of 3x would also multiply IF to something staying much above device limit of 25mA.
Do you know a opto coupler that has THL longer than TLH?
For an optocoupler, a simple and straightforward means of speeding up the output is to employ a cascode connection.
Generally these parameters are informed on parametric search tools as having the same value or THL>TLH, but not the opposite, and don´t know the technical reason. Anyway, once you are apparently dealing with severe speed transfer requirements, why don´t you consider use some opto coupler based on active device as for instance this here ?
https://www.mouser.com/ds/2/38/V02-2947EN_DS_ACPL-M484_2013-09-23-256503.pdf
The main requirement is an difference between TPHL and TPLH larger than 400ns and less than 800ns (400ns<TPHL-TPLH<800ns)
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