To my knowledge, boost PFCs are almost never operated in DCM at high load. You'll get faster loop response, but at the cost of higher input ripple current.
Thanks, for a 150W PFC stage, with input = 230VAC, output = 400V, L=450uH, F(sw) = 100kHz, then its pretty much in DCM all the time, and the peak current is only about 2.1A. This is very manageable as you know.
In fact, i attach the inductor current waveform herewith.
LED drivers, specially decorative ones, often switch on and off at full load. This obviously causes deviation in the output voltage of the PFC stage, and the PFC output voltage deviation can be made less (without needing a bigger PFC output capacitor) IF your transient response is slightly quicker.
Another point is that almost all the offtheshelf PFC inductors are at the lower Henryic value range, (below 450uH),..this often means DCM operation, but can sometimes be worth it to benefit from the offtheshelf inductor…specially if your volumes are small and your company’s ERP system simply cannot handle another custom wound component, with all the background logistical operation and communication that custom wound components inevitably involve.
The following two offtheshelf PFC chokes are typical of what’s on offer offtheshelf. As you can see, they are relatively low Henryic values..
PQ core PFC inductor by we-online.com (330uH)
https://katalog.we-online.de/pbs/datasheet/760806302.pdf
Coilcraft PFC inductor: (450uH)
**broken link removed**