Not really, but the first thing you have to understand,is that in the buck-boost topology the current in the switch is Iin+Iout so for 74V in and -74Vout with 150mA of load your Switch current would be 300mA or so plus the ripple.
Reading the datasheet it looks like the part turns on for the lesser of 10usec or until the current limit is reached. Furthermore there is a minimum off time of 13usec. So that sets an fmax of about 77khz. The minimum frequency? I dunno as the load gets lighter and lighter the pulses space out and the frequency drops through some hidden MPS magic the peak current is also reduced in an attempt to prevent frequency dropping into the audio band and to improve efficiency. It looks like it may drop to about 150mA peak. Which drops the energy per pulse by about 20X.
At a guess, at 40V in at full load on the op 11.25W You get an Iin of 280mA . The inductor current will be Iin + IOout 430mA . With a peak turn off off 620mA the inductor is going to have about 380mA of ripple. To get a delta I of 380ma in less than 10usec with 40V the inductor needs to be about 950uH. Pick maybe 1.2mH with an Isat of above 750mA and you should be good. Once the inductor falls beneath about 1mH you run the risk of not being able to support the load at Vmin.