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LM5106: Min and Max Dead Time

Pedro Silva1
Prodigy 10 points
Part Number: LM5106

Hi,

In the datasheet I found:

"The LM5106 is a single PWM input gate driver with Enable that offers a programmable dead-time. The dead-time is set with a resistor at the RDT pin and can be adjusted from 100 ns to 600 ns. The wide dead-time
programming range provides the flexibility to optimize drive signal timing for a wide range of MOSFETs and applications."

But when I look at Figure 19 it seems that the maximum RDT is 110k. 

So my question is, can we go with the RDT above 100k? Can I get a dead time of 800ns using a 150k resistor?
I know that the temperature will change the resistance, but at normal temperatures can we use Figure 19 to extract the correct RDT value? Because that sentence at the beginning says otherwise... 

Thanks

Pedro S.

  • +1
    TI__Genius 9301 points

    Hi Pedro, 

    Welcome to the forum and thank you for your question! While increasing the resistor value would result in a longer dead time as shown in the plot, I recommend to keep the resistor to the range specified in the electrical characteristics table (100K max to produce 600ns). A couple of reason are that we characterize the device up to the maximum 100K value recommended and have not run characterization beyond that. Another concern with increasing the resistor value is that the current on this pin will be smaller and be more susceptible to noise fluctuations.

    Best regards,

    Leslie

  • 0 in reply to Leslie Marquez
    Prodigy 10 points

    Thanks for the help.