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TPS54240 Ground and Rise Time Question

John Demery
Intellectual 2745 points
Other Parts Discussed in Thread: TPS54240

All:

One of my customers plans on using the TPS54240 as an inverter based off an app note.  One question in particular is if they tie the ground to a negative voltage, how does that impact the maximum ratings.

For instance, would PWRGD now range from -6.8 to -0.5V instead of the -0.3 to 6V?  Is this acceptable?

Additionally, I see the minimum controllable on time as being 135ns.  Could I get clarification on what the rise time of the FETs are?

Thanks for your assistance.

Sincerely,

JD

  • 0
    TI__Guru**** 191445 points

    The absolute maximum ratings are the same relative to the IC ground pin.  So if a pin was rated from 0 to 10 V and the ground is at -5V, then the rating would be -5V to +5V.

    I don't have a numbe rfor the switching node ris time, but it is "fast", on the order of a few nsec.