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Selecting the proper Mosfet driver parts

Dimit Ariti
Prodigy 110 points
Other Parts Discussed in Thread: UCC27511, UCC27519, TPS2828

Hello all

I'm trying the drive IPP60R099C7 power mosftet in PFC boost stage with Switching frequency equal to 125kHz.  . This Mosfet Qg is 45nC and I believe either UCC27511, UCC27519 can easily drive it. Both UCC27511, UCC27519 cost the same and come with SOT-23 package  and have similar output current capabilities (4 amps for both) . . The UCC27519 has enable feature but UCC27511 can also be configured to have enable capability also. The  UCC27511 has a great advantage of split output so resistors  with different values can be used for turn on and turn off . It  will save at least one schottky diode and more space so that driver  can be positioned closer to Mosfet to minimize EMI issue. Now the question is that  while UCC27511 offering such great advantage    why somebody want to use UCC27519? What I'm missing here? Is there a  limitation with UCC27511 that I'm not aware of?

  • 0
    TI__Mastermind 23215 points

    Hello Mosi,

    In many respects, the UCC27511 and UCC27519 do have similar parameters regarding driver current and Vdd operating range.

    A couple of points I notice on the UCC27519 is that It is pin compatible with the TPS2828 and TP2829 which would be an advantage if the user has a design compatible with this pinout.

    Also one difference of the UCC27511 and the UCC27519, is that the input thresholds are CMOS level (% of Vdd) on the UCC27519 and fixed threshold levels for the UCC27511. At higher Vdd levels, the hysteresis of the turn on threshold and turn off threshold is higher on the UCC27519 (1.9V) Vs 1V for the UCC27511.

    As you suggested, the split output of the UCC27511 is an advantage in many designs to optimize the turn on and turn off speed of the power MOSFET. If the parameters of the UCC27511 are compatible with your design, this is a good choice.  

  • 0 in reply to Richard Herring
    Prodigy 110 points
    Thanks for your prompt response. I have one other question:
    I've been told that I'm using a TI driver I need to use schottky diode (something like SK16 diode) from driver output to VCC. This is to protect the driver internal output stage top transistor against reverse current by providing a low impudence path. However, I didn't see any recommendation on any of TI apps. can you please provide me with your feedback?