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UCC27524 Driving BJT Totem Pole

Heber Redd93
Prodigy 20 points
Other Parts Discussed in Thread: UCC27524

What are the limitations of the ucc27524 driving a BJT Totem Pole? 

  • 0
    TI__Expert 3200 points
    Heber, I will get you connected to an AE to help answer your question.
  • 0
    TI__Intellectual 2910 points
    Heber, usually a gate driver is not necessary to drive a BJT totem pole due to the low voltage/current needed to turn bipolar devices on or off. That said, there is nothing preventing the use of a device such as UCC27524 to do this. I would recommend using a series resistor to the base of each BJT to limit the current and protect the base.

    The UCC27524 is a dual low-side driver -- is the plan to drive each BJT separately?

    Please let us know more about what your application, particularly why you are thinking of using a driver., so we can provide better assistance.
  • 0 in reply to Daniel Ruiz
    Prodigy 20 points
    Thanks for responding. OutA is driving a push-pull BJT pair and OutB is driving a 2nd push-pull BJT pair to drive a primary of an aux power supply. Switching frequency is about 0.5MHz.
  • 0 in reply to Heber Redd93
    TI__Intellectual 2910 points
    Heber,

    Thanks for providing more details. Yes, UCC27524 will work for driving a BJT totem pole the way you described.

    Given the high drive strength of the UCC27524, ensure a proper series resistance is used to keep the base current within the specifications for the specific transistors used in order to protect the BJTs.