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Ask an Expert Forum Trying to find a high-speed, high-power transistor to use as a switch
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Trying to find a high-speed, high-power transistor to use as a switch

ZappaMap
ZappaMap over 1 year ago

I'm designing a high power H-bridge circuit, and I'm trying to find the best transistor for the design. The most important parameters are that it has
- 10MHz switching speed frequency

- Low on-state resistance

- Low off-state capacitance

From there, I would need it to handle high voltages and have a low gate charge. With that in mind, does anyone know of any parameter relationships I should be aware of or what products potentially match that description? Thank you!

EDIT:

Thank you all for your responses! To answer a couple questions I saw:

- I do not have a preference between MOSFETS and BJTs.

- For voltage and amperage, I don't have hard numbers for those. I'm still operating in the tradespace stage of the design right now, so I'm still figuring out what options I have. To give a ballpark range, a component that works with volts on the order of 10V or 100V and amps on the order of 10A wouldn't hurt. I am more concerned with the switching frequency, on-state resistance, and off-state capacitance.

I also learned a little more about switchmode amplifiers, and that is another avenue that I am now looking down (specifically class D and E).

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  • michaelkellett
    michaelkellett over 1 year ago +5
    I think you'll need to quantify the current and voltage to get good advice. 10MHz is very fast for typical H bridge type applications. Do you have a preference between MOSFETs and BJTs ? As you probably…
  • dougw
    dougw over 1 year ago +3
    You might have a look at Gallium Nitride transistors.
  • scottiebabe
    scottiebabe over 1 year ago +3
    You may also consider pre-engineered GaN half-bridge modules or ultrasound pulse drivers.
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  • michaelkellett
    0 michaelkellett over 1 year ago in reply to $parentForumReply.Author.DisplayName

    http://www2.arrl.org/files/file/QEX_Next_Issue/2014/May-Jun_2014/Horowitz.pdf

    But .... this is a quasi linear application of an IGBT.

    The rise and fall times (of the IGBT they used) add up to 37ns so they wouldn't work in a switching H bridge at anything like 20MHz - might scrape1MHz but they would get warm.

    But unless the OP comes back an explains better what they are looking for we are, to coin a phrase, "switching in the dark" (although he did say switching speed, but he might have meant switching frequency which is more commonly measured in Hz)

    Has anyone (here on E14) used IGBTs in a linear application.

    There is a nice Analogue Devices app note for an audio power amplifier design but you can't buy the P channel parts any more.

    I've used IGBTs in linear (high-ish) power regulators with reasonable success.

    MK

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  • shabaz
    0 shabaz over 1 year ago in reply to michaelkellett

    I have not used them (linear or otherwise), although I'm interested. IGBTs passed me by, they were not taught when I was at uni, and I didn't come across them in any on-the-job (or otherwise) applications or training. I missed out. And now there are interesting high power and voltage semiconductors like SiC for high power or GAN for power+speed, so I'm unsure when IGBTs would be selected (presumably they are lower-cost than SiC). I've experimented a bit with SiC parts for switching, but even the experiments end up pricey.

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