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UCC29910A: Design Tool Questions

Carter Timm
Prodigy 210 points
Part Number: UCC29910A
Other Parts Discussed in Thread: UCC29910,

Greetings,

Short background on the application: I am creating a 90-528 VAC input, 24V 150W output PFC power supply. I'm looking at a buck-boost topology for this to regulate Vbulk at around 400V regardless of input. Because I cannot find a buck-boost PFC controller (please let me know if you have one available or know of one), I am utilizing the UCC29910 and an additional unchosen PFC boost controller with additional circuitry to control which one is active, etc.

I'm looking at the UCC29910A Design Calculator (rev A) (SLUC265) and have a couple of questions.

1. For the 'minimum AC input' field, should this number be the minimum AC input voltage that could ever be present or the minimum AC input voltage where the controller should be running? There is a distinct difference in my design because from 90-282 VAC input I will want to boost to 400V and from 283-528 VAC input I want the UCC29910 active. The 282/283 crossover range is flexible if you have a better suggestion, it's just right at the 400V mark.

2. What does the 'boundary AC input voltage' field refer to?

Thank you for your time,

Carter

  • 0
    TI__Guru 55285 points

    1. For the 'minimum AC input' field, should this number be the minimum AC input voltage that could ever be present or the minimum AC input voltage where the controller should be running? There is a distinct difference in my design because from 90-282 VAC input I will want to boost to 400V and from 283-528 VAC input I want the UCC29910 active. The 282/283 crossover range is flexible if you have a better suggestion, it's just right at the 400V mark.

    Minimum AC input is the minimum input when you want to UCC29910A to operate. If you want UCC29910A to start operate from 282Vac, that is min.

    2. What does the 'boundary AC input voltage' field refer to?

    Your UCC29910A operation is between 282Vac and 528Vac, you can pick up some voltage in between to make design. In the design sheet, 160Vac is about in the middle of 90Vac to 264Vac.