Author Topic: Logic question  (Read 432 times)

Offline dj.cosmo.esq

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Logic question
« on: April 17, 2020, 10:47:45 PM »
Ok so I'm going through the motions on making a driver and if possible can someone explain if there is a difference between two gates. One inverted and one non inverted going to a dual non inverted output driver. Versus splitting a single gate signal going to a driver that's dual output but one inverted and one non inverted. Wouldn't the output to the mosfets be the same? Or am I completely off?
Thanks,
Courtney

Offline T3sl4co1l

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Re: Logic question
« Reply #1 on: April 21, 2020, 06:31:39 PM »
Yes, down to timing differences.  Also the dual driver may have dead time generation inside, or may be independent, which also factors into timing.

Tim

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Re: Logic question
« Reply #2 on: April 25, 2020, 09:07:02 PM »
Thanks for the response tim. I think I can elaborate more now the deeper im getting into it. So say the signal is coming through the gates. One inverted and split through another inverter so now two signals are going to the driver let's say UCC27423. So if I take that same signal and run it without splitting it to invert to the UCC27423 it would destroy the output putting both high, correct? However if I used a UCC27425 I would get the desired output? Is there a more beneficial reason to split up the signal earlier in the logic vs at power output stage of a drsstc driver. Sorry if it's a stupid question but I haven't found a definitive answer anywhere. Thanks

Offline T3sl4co1l

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Re: Logic question
« Reply #3 on: April 27, 2020, 05:07:42 AM »
That's a duplicate thread, I guess: https://highvoltageforum.net/index.php?topic=1050.0

If you're talking about drivers with transformer outputs, one inversion is obligatory, otherwise nothing comes out.

You can use a single dual complementary driver.  These aren't usually rated as high as single drivers, since, well, there's two of them.
For more output, two separate drivers might be used.
The two can be complementary, in which case you need two part numbers, adding another BOM item.
If they are identical, you need an inverter somewhere.  Which you might already have, for other logic functions.  Otherwise, an inverter must be added, increasing parts count, and maybe adding a BOM item too.

The kind with dual complementary inputs are handy, you can just wire the input for inverting or non-.  I forget if there's a UCC family that has that.  FAN3100 does.  Think some TC4xxx's do?  Lots of families to choose from, in any case.

Drivers with independent gate drivers (usually the dual bootstrap type, or independent isolated driver modules) need the correct polarities and dead timing, else the inverter will be destroyed.

Incidentally, inverters can be made in the current-sourcing type, where dead time is both switches on.  These are less common, but absolutely possible; it's not a foregone conclusion that the inverter is always voltage-sourcing (where dead time is both switches off).  Also, in both cases, a small or even negative dead time can be useful for adjusting commutation efficiency, but this is also not common (or needed) in the present application.

Tim

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Re: Logic question
« Reply #3 on: April 27, 2020, 05:07:42 AM »

 


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