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UCC256301: About suitable device for Non-PFC

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Guru 21045 points
Part Number: UCC256301
Other Parts Discussed in Thread: UCC256302

Hi Team,

 

Our customer doesn’t use PFC for application.

Then, could you please let us know the best solution for Non-PFC (UCC256301 or 2 or 3 or 4)?

 

And, I have one more question.

They would like to use UCC25630x at AC120V and AC240V.

Then, they would like to control a peak output power at AC120V and AC240V in less than 10%.

(For example, if Peak output power at AC120V is 20W, AC240V is 22W.)

I understand that UCC25630x can adjust over current protection value.

Could you please let us know if you have any idea?

 

Regards,

Kanemaru

  • 0
    TI__Mastermind 27145 points
    Hi Kanemaru-san,

    Thanks for your interest in UCC25630x. A high voltage startup function would be beneficial in offline LLC applications. HV startup is included on versions 1, 2 and 4. If you use a voltage doubler in front of the LLC then you will want a version without X cap discharge (UCC256302).

    It will be very difficult to realize a LLC for both 120V input and 240V input. The reason for this is LLC does not handle wide input voltage range well as it will be forced to operate far away from the resonant frequency at either high line or low line depending on how the resonant tank is designed. Operating far away from the resonant frequency will result in very poor efficiency.

    Yes, UCC25630x does have overcurrent protection. Please keep in mind however that this protection senses the resonant current on the primary side. The resonant current will have considerable change in magnitude at low line compared to high line. If you need <10% change in the OCP trip point, it would be better to implement an external OCP detection circuit on the secondary side.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    Guru 21045 points

    Hi Ben-san,

    Thank you for your prompt reply and information.

    I understand. Thank you very much.

    Regards,

    Kanemaru