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UCC27714: UCC27714

Alex Gomes
Prodigy 10 points
Part Number: UCC27714

I am interested in using a high side gate driver (ex. UCC27714) with an N channel MOSFET to act like an electronic switch for a high voltage operation. I've researched a bit about high side gate drivers and noticed that they have a draw back in continuous operation cases. My case is the following:

  • Source a 150V and 2A (300W) to charge a capacitive load
  • The capacitive load needs about 15 to 20 seconds to fully charge (the N MOS would need to remain active for this time)
  • Power source is connected to the Drain
  • Capacitive load is connected to the Source

Would the UCC27714 gate driver work in this case?

Is there another gate driver that would be better recommended?

Would I need to use some sort of PWM to make this switch work? (I am not converting any voltage, just charging a capacitor and using the MOSFET as a switch)

Would I need to use a bootstrap capacitor and diode for this design?

Thank you,

Alex

  • 0
    TI__Prodigy 430 points

    Hi Alex,

    Thank you for your interest in UCC27714. It sounds like you are interested in having a bidirectional circuit switch. You can read about the specifics in this application note here. The guide will explain this switch in detail and also aid in component selection. As a summary, you can use the low-side driver of a half-bridge driver as a charge pump to the high side supply, HB, through a charge pump capacitor. This approach is best suited to DC "on/off" operations or low frequency operations since the charge pump capacitor usually has a large value. This will keep the high side biased as you are charging your capacitive load for your required length of time. This FAQ also discusses various ways to bias the high side of a half bridge gate driver, where a bootstrap method is not adequate. 

    Regards,

    Zihao