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How does MOSFET dirver-UCC27424 work?

Henry Kang
Intellectual 1080 points
Other Parts Discussed in Thread: UCC27424

Hi All,

I have a question about UCC27424, the block diagram as following picture.

Here is the question, what's the CMOS and TTL (in the red circle) functions?

In my concept, I think COMS is for quickly propagated for output, and TTL is for high driver current.

Is my concept make sense?

Regards,

  • 0
    Prodigy 10 points
    the fuction on the red circle its for PUSH PULL...can be on transistor or mosfet. if you noted the mosfet is one p-channel and other n-channel...
    on transistor its dual npn but one its not the other... so when on the base of the top its "1" on the botton transistor its "0"...
  • 0
    TI__Intellectual 2230 points
    Hi Henry,

    The output stage of UCC27424 is constructed of bipolar and MOSFET transistors in parallel, the bipolar carry most of output current when OUT swings betweet 1/3 to 2/3 VDD and the MOSFET pull the output to the High or low rail as it has much lower Vdson. The combination can provide large currents over a wide range of supply voltage to improve drive efficiency at the Miller plateau region during the MOSFET switching transition.

    Best Regards,
    Oliver