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UCC21750: Maximum delay between two devices

David Bohne
Prodigy 10 points
Part Number: UCC21750

Hello,

I want to find out, to what extent two different devices can differ in their maximum delay of the gate driver output. In my understanding, there is the propagation delay (which is just dependend on temperature as depicted in the grap in the datasheet) and the rise and fall time (which are also just dependend on temperature).

Summing up these two parameters (propagation delay + rise / fall time), the maximum delay for each device is something in between, right?

And if I want to find out the maximum difference between the delays of two different devices, can I just assume the part-to-part skew and ignore the information about the propagation delay and rise/fall time (if I assume the same operating conditions for these two devices)? Or is it more complicated? If I just consider the part to part skew, the maximum deviation is 30ns?!

Thank you in advance for your help.

Best regards

David

  • +1
    TI__Expert 7473 points

    Hi David,

    Thanks for the interesting question. Propagation delay time, low-to-high level output (tPLH) is the time between the specified reference points on the input and output voltage waveforms with the output changing from the defined low level to the defined high level (for UCC21750 it is 50% to 10% or 90% based on rising or fall and inverting or non-inverting logic). The maximum prop delay is 130 ns for VCC=5.0V, 1uF capacitor from VCC to GND, VDD–COM=20V, 18V or 15V, COM–VEE = 3V, 5V or 8V, CL=100pF which also depends on temperature

    The maximum part to part skew is 30 ns for VCC=5.0V, 1uF capacitor from VCC to GND, VDD–COM=20V, 18V or 15V, COM–VEE = 3V, 5V or 8V, CL=100pF which also is temperature dependent

    And if I want to find out the maximum difference between the delays of two different devices, can I just assume the part-to-part skew - The answer is Yes!

    Hope this helps!

    Best,

    Pratik