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About 2-Switch forward solution

Tsukui Yusuke
Guru 21930 points
Other Parts Discussed in Thread: LM5100A, UCC27211A, UC2844A, UCC28C40, UCC28C44, UC2844

Hi,

Customers are considering various forward circuits.
I got three questions from customers.
Could you give me your advice?

1.Please introduce a gate driver that can be turned on at the same time.
   Customers need it for 2-switch forward.

2.Could you introduce TI's forward converter design and new products?

Customer is designing AC/DC converter for chargers.
(Considering developing solutions other than LLC resonance solution)

Best Regards,
Yusuke / Japan Disty

  • 0
    TI__Genius 17090 points

    Yusuke-san, can you please tell us what kind of charger?  Phone?   Electric Vehicle?  USB C?

  • 0 in reply to Ian Bower
    TI__Genius 12990 points
    Hi Yusuke-san,

    I am an apps engineer, part of the gate drivers team, and will help with the gate driver part of your question.
    For gate drivers – any half bridge gate driver that will allow the outputs to happen simultaneously will work. The LM5100A can be used (also found in thread here: e2e.ti.com/.../2268277. A newer/ more flexible option is the UCC272xx family of half bridge drivers such as UCC27211A.

    Can you tell me more about your system constraints and application?

    As far as for controllers – a generic PWM is all that is needed. UCC28C40 (suggested by the controller group) or UC2844A found from this thread can be used. (e2e.ti.com/.../2124376 )

    Thanks,
  • 0 in reply to Jeffrey Mueller
    Guru 21930 points

    Jeff-san,Ian-san,

    Thank you for your response.
    The type of target charger is a power tool (lawnmowers etc.).
    Target power is 100W ~ 300W(max).

    When LLC is used, the output voltage range is restricted.
    In addition, ripple at CRM increases.

    In order to clear the above problem,
    Customers are researching and developing forward and 2 switch forward.

    Let me ask you one more thing.
    １．Is there a design example of a forward circuit targeting 100W to 300W?
    ２．Is UCC28C44 and UC2844  gate driver suitable for 2 switch forward?

    Best Regards,
    Yusuke / Japan Disty

  • 0 in reply to Tsukui Yusuke
    Prodigy 5 points
    Please see this paper I authored for the TI/Unitrode Power Seminars.
    Design Review: A Step-By-Step Approach to AC Line-Powered Converters
    http://www.ti.com/lit/slup229

    This is a 2 switch forward, offline, 150W design with coupled inductor outputs.

    More Seminar material is located here:
    www.ti.com/.../index.html