• State Resolved
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 32 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

UCD3138: Totem pole PFC

Kwangwoon Lee
Prodigy 10 points
Part Number: UCD3138
Other Parts Discussed in Thread: PMP20873

Hello, teams

 My customer is interested in 3 phase AC input Totem-pole PFC for their product about 15kW.

 They want to use the pfc output voltage by varying it to the maximum possible range.

The AC input voltage is as follows:

      Phase-to-phase input voltage: 350 ~ 450Vac
      (Minimum Phase-to-Neutral input voltage: 200Vac) 

 What are the minimum and maximum possible output voltage?

Regards,

KW

  • 0
    TI__Expert 3220 points

    Hello KW,

    Thank you for you interest in the UCD3138x devices and totem-pole PFC. Our most relevant design is the PMP20873: https://www.ti.com/tool/PMP20873.

    A boost PFC requires boosting at least the maximum input voltage with some margin. At 450VAC, the peak voltage will be 450V*√2 = 636V. 650V would be the a target minimum output voltage. Boost PFC has a theoretical unlimited max output voltage but in reality a boost converter can only go up to around ~3-4x times. However, having a wide output voltage range is not recommended since the efficiency will decrease. Efficiency will be maximum when the boost output is minimized. It may be better to have a separate DC/DC stage after the PFC instead.  

    The overall concepts for a boost PFC should be similar for totem-pole PFC. 

    Regards,

    Jonathan Wong

  • 0 in reply to Jonathan Wong
    Prodigy 10 points

    Hi, Jonathan,

    thanks for your information.

    BR,

    KW