L4981B controller for use with 115V, 400Hz ac input

Yes, the L4981B can potentially be used at 400Hz, but it will not be a drop-in guarantee of the same performance as at 50/60Hz.

A near-unity power factor at 400Hz is achievable, provided the PFC stage, inductor, current loop compensation, and bus-voltage loop are all designed and validated for that frequency. Key point: the controller alone does not ensure unity PF; the overall power stage design is critical.

For specific guidance on possible alternatives, further information would be needed, e.g.:

• power level
• single- or three-phase topology
• and target DC bus voltage,

As the case with 400Hz occurs far less frequently than in typical industrial applications, there is little generally applicable guidance, so each design must be considered separately. It is very likely that the community will not really be able to help you here, so it may make sense to ask technical support at your local distributor about this.

Hope this helps?

Regards
/Peter