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UC3845: Higher Driver Strength Device Replacement

Francis Jiang
Expert 3160 points
Part Number: UC3845
Other Parts Discussed in Thread: UCC25800

Tool/software:

Hi Team,

Do we have other higher driver strength device like UC3845?

Customer uses UC3845 driving isolation transformer to drive post-stage MOS, now the MOS is paralleled, so the driver strength of UC3845 should also bigger now.

They don't like UCC14240 series, as it is single source.

Any further questions please feel free to let me know.

BRs,

Francis

  • 0
    TI__Mastermind 32775 points

    Not sure I understand the comparison between UCC14240 and UC3845? Most PWM controllers with integrated gate drive will be limited to ~±1S source/sink drive current but take a look at TI PWM controllers and if the controller cannot be changed, then consider TI low-side gate drivers as a higher current interface between the PWM controller and parallel MOSFET combination.

    Regards,

    Steve

  • 0 in reply to Steven Mappus1
    TI__Expert 3160 points

    Hi Steven, 

    Let me get the customer's schematic to you, it is quite difficult to explain the application by words. Will update here later.

    BRs,

    Francis

  • 0 in reply to Francis Jiang
    TI__Expert 3160 points

    Hi Steven,

    I find the UCC25800 that is same as customer application, which is shown below, the transformer secondary side is connected the VCC of isolated gate driver, as the isolated power supply.

    Hope this can help you understand the current application of UC3845. And would like to double check with you whether we have other higher driver strength device. Thanks in advance.

    BRs,

    Francis

  • 0 in reply to Francis Jiang
    TI__Mastermind 32775 points

    You have shown/mentioned all three types of bias supplies: (1) UC3845 as distributed flyback (1) UCC14240 with integrated transformer and (3) UCC25800 is a open loop transformer driver. When you mention "driver strength", I believe you mean bias supply power capability but the term is somewhat confusing because "driver strength" is a measure of the drive current capability for a gate driver.

    Steve