Author Topic: Looking for a high speed comparator for use in UD2.X drivers  (Read 1420 times)

Offline Late

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Looking for a high speed comparator for use in UD2.X drivers
« on: October 16, 2023, 11:25:44 PM »
Hello there,
Recently I've been working on making my own DRSSTC driver by modifying the already existing UD2.7 design by adding some new features and replacing all the ancient parts. Also have been doing some cost optimization. Though i have ran into the issue that I'm unable to find any relatively cheap and modern replacement for the tl3116 high speed comparator that's used for the feedback on UD2.7C.
Does anyone know of any relatively cheap and relatively modern ICs that would work for this task?
Second question is does anyone maybe know of some modern, cheap and available gate driver ICs that would work here too?

Thanks in advance for help,
Late
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline davekni

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #1 on: October 17, 2023, 06:22:23 AM »
Quote
Though i have ran into the issue that I'm unable to find any relatively cheap and modern replacement for the tl3116 high speed comparator that's used for the feedback on UD2.7C.
I've been using TLV3501 and quite happy with it.  Input range and output swing are both rail to rail.  However, it has a single output, not differential.  Not hard to deal with if AND gates following comparitor are replaced with a mux chip such as 74AHC157 as in this version:
https://highvoltageforum.net/index.php?topic=2054.msg15611#msg15611

Rail-to-rail capability makes adding self-oscillation easier too.  In above schematic and in this snippet:
https://highvoltageforum.net/index.php?topic=1336.msg9894#msg9894

Quote
Second question is does anyone maybe know of some modern, cheap and available gate driver ICs that would work here too?
Haven't searched much for UD2.7 driver options.  With only 9V needed, there are likely lots of options.  In case interested in driving small H-bridges (ie. single TO247 IGBTs) without GDT FET buffer stage, here's a post of driver chip options good to 20V or higher:
https://highvoltageforum.net/index.php?topic=2400.msg17650#msg17650

Another option to consider:  Use logic-level FETs for buffer stage, FETs with specified on resistance etc. at Vgs of 4.5V or less.  Logic level FETs can be driven directly from 5V logic.  Eliminates need for 9V supply.  If FET gate charge is low enough, something like 74AHC157 could drive gates directly.  For larger FETs, a CMOS buffer/inverter could be added.  For a hex inverter, parallel 3 to drive each P/N FET pair.
« Last Edit: October 18, 2023, 04:55:39 AM by davekni »
David Knierim

Offline Anders Mikkelsen

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #2 on: October 17, 2023, 04:45:31 PM »
MCP6561/MCP6562 are also nice options. Not as fast as the TLV3501 or TL3116, but very good value if your application can live with some 50 ns propagation delay.

Offline Late

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #3 on: October 19, 2023, 10:04:15 AM »
I've been using TLV3501 and quite happy with it.  Input range and output swing are both rail to rail.  However, it has a single output, not differential.
Thanks for suggestion.
Could i possibly use the TLV3502 which has 2 comparators in it and just connect the inverted input of one to noninverting input of the other and noninverted of one to inverting of the other to get one of the outputs to be inverted? or would that not work?
« Last Edit: October 19, 2023, 10:06:27 AM by Late »
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline davekni

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #4 on: October 19, 2023, 10:05:42 PM »
Quote
Could i possibly use the TLV3502 which has 2 comparators in it and just connect the inverted input of one to noninverting input of the other and noninverted of one to inverting of the other to get one of the outputs to be inverted? or would that not work?
Probably would work.  However, if a dual comparitor is really the best option, I'd use the second comparitor as an inverter after output of first comparitor.  Or just add a normal inverter.  Dual inverters are available in small packages such as 6-lead SOT23, ie. SN74LVC2G04.
David Knierim

Offline Late

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #5 on: October 20, 2023, 09:39:47 AM »
However, if a dual comparitor is really the best option, I'd use the second comparitor as an inverter after output of first comparitor.  Or just add a normal inverter.  Dual inverters are available in small packages such as 6-lead SOT23, ie. SN74LVC2G04.
Okay thanks!

Also i was looking on LCSC and found this comparitor GS8743-TR. It seems to be pretty fast and its also cheap. Would it work in this application on the UD2.X type boards?

Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Offline davekni

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #6 on: October 20, 2023, 10:19:04 PM »
Quote
Also i was looking on LCSC and found this comparitor GS8743-TR. It seems to be pretty fast and its also cheap. Would it work in this application on the UD2.X type boards?
Yes, looks like a great and inexpensive comparitor.  The SOT23-5 package is small, but still large enough to hand solder.
As with TLV3501, it is single output, not differential.  Not that difficult to handle, such as with SOT23-6 LVC2G04 or using a mux chip for enable and phase reversal logic instead of AND gates.
David Knierim

Offline Late

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #7 on: October 20, 2023, 10:39:57 PM »
The SOT23-5 package is small, but still large enough to hand solder.
I have experience soldering small parts with hand such as 0402 parts but for this board im planning to use a stencil and reflow solder the whole board so small parts arent an issue.

Quote
As with TLV3501, it is single output, not differential.
Yeah ik. Planning to use a small inverter ic to invert the output

Thanks for the help
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

YouTube: LateNightProjects

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Re: Looking for a high speed comparator for use in UD2.X drivers
« Reply #7 on: October 20, 2023, 10:39:57 PM »

 


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