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UC2825A: how to produce synchronous rectifier driver signal using OUTA and OUTB signal of UC2825A

Part Number: UC2825A
Other Parts Discussed in Thread: LM5035

Tool/software:

 hi  expert ,   i want to  use uc2825a for a full bridge design, but this device has only two driver output . any ideas of  how to  drive   synchronous rectifier

 MOSFET using OUTA and OUTB  to produce SRA and SRB signals like the picture belwo ?  Thanks.

  • Hi,

    You need two half bridge drivers for full bridge converter. 

    Each half bridge driver drive diagonal MOSFETs.

    SRA and SRB need to match as show. You need to add delay circuit to make dead time. So not an easy way.

    Why not using an advanced one to make such a control, such as LM5035 which can produce SR signals. 

    If you want to use UC2825A, you would need to add discrete circuit to achieve.