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  • Cute new part: LMG5126

    From Phil Hobbs@21:1/5 to All on Tue Jul 1 15:17:07 2025
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims
    98% efficiency doing 21-24V at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs
    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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  • From john larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Tue Jul 1 13:39:52 2025
    On Tue, 1 Jul 2025 15:17:07 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims
    98% efficiency doing 21-24V at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs

    TI is doing some cool GaN stuff lately. We were considering using
    their LMG2100R044, which is a 100v 35a half-bridge, but it was
    overkill for our little project. Still, it's impressive.

    I have a summer intern, a really smart kid, and one of his projects is
    to make a high voltage pulse generator using power GaN fets. There are
    some 700v parts around now.

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  • From Phil Hobbs@21:1/5 to Phil Hobbs on Wed Jul 2 01:36:04 2025
    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims

    98% efficiency doing
    24V
    at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs



    --
    Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

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  • From john larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Wed Jul 2 09:36:16 2025
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims

    98% efficiency doing
    24V
    at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs

    What will you do about the transformer?

    The local Coilcraft guy is coming over this morning. He could buy us
    lunch.

    Their planar transformers could be made into some screaming fast
    parts.

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  • From Phil Hobbs@21:1/5 to john larkin on Wed Jul 2 13:40:56 2025
    On 2025-07-02 12:36, john larkin wrote:
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims

    98% efficiency doing
    24V
    at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs

    What will you do about the transformer?

    The local Coilcraft guy is coming over this morning. He could buy us
    lunch.

    Nice day for it, according to Accuweather.(*)

    Their planar transformers could be made into some screaming fast
    parts.

    For 0.01% of their customers. ;)

    What I want it for is all unipolar, so just the fast regulator plus a
    linear stage is the ticket.

    I might use something like a 48V POE supply and buck down to do the same
    thing.

    Cheers

    Phil Hobbs

    (*) As an aside, is Accuweather as uniformly pessimistic where you are?
    In NY it's always predicting clouds and rain, which frequently don't
    show up, and when the do, usually aren't nearly so dreary as they claim.


    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Joe Gwinn@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Wed Jul 2 14:34:21 2025
    On Wed, 2 Jul 2025 13:40:56 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    On 2025-07-02 12:36, john larkin wrote:
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs
    <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims [snip]

    (*) As an aside, is Accuweather as uniformly pessimistic where you are?
    In NY it's always predicting clouds and rain, which frequently don't
    show up, and when the do, usually aren't nearly so dreary as they claim.

    Yes, same in Boston (and likely everywhere), because people complain
    more about having their picnic rained out than if the warning was
    wrong.

    My favorite is Clime NOAA, which works worldwide. You do pay about
    $40 per year, so Clime can purchase the realtime radar and satellite
    data feeds.

    With Clime, you decide the optimism/pessimism balance.

    .<https://climeradar.com/>

    Joe

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  • From john larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Wed Jul 2 11:26:15 2025
    On Wed, 2 Jul 2025 13:40:56 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    On 2025-07-02 12:36, john larkin wrote:
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs
    <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims

    98% efficiency doing
    24V
    at several amps.

    It's advanced info, but TI claims that the 1000-pc price will be $4.
    I'm looking forward to using it for some Class-H stuff.

    Check it out!

    Cheers

    Phil Hobbs

    What will you do about the transformer?

    The local Coilcraft guy is coming over this morning. He could buy us
    lunch.

    Nice day for it, according to Accuweather.(*)

    We're hoping it might get up to 60F today.

    Sunday was Gay Freezing Day here. Sequins turn out to be not very good
    thermal insulation.



    Their planar transformers could be made into some screaming fast
    parts.

    For 0.01% of their customers. ;)

    Megahertz GaN power is a big deal lately. They need small, low loss,
    well shielded transformers.



    What I want it for is all unipolar, so just the fast regulator plus a
    linear stage is the ticket.

    I might use something like a 48V POE supply and buck down to do the same >thing.

    We're using the Silvertel PoE pickoff brick. I could share schematics.



    Cheers

    Phil Hobbs

    (*) As an aside, is Accuweather as uniformly pessimistic where you are?
    In NY it's always predicting clouds and rain, which frequently don't
    show up, and when the do, usually aren't nearly so dreary as they claim.

    We're in the Alamany Gap microclimate. It's a cold fog channel between
    the ocean and the bay.

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  • From john larkin@21:1/5 to Liz Tuddenham on Wed Jul 2 14:30:12 2025
    On Wed, 2 Jul 2025 22:15:39 +0100, liz@poppyrecords.invalid.invalid
    (Liz Tuddenham) wrote:

    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It doesn't rain here between March and November.

    It doesn't stop raining here between November and March. (...except
    when it snows.)

    I had a motorcycle in New Orleans. It would reliably rain hard between
    about 1 and 3 PM most every day, but I could bike to/from work.

    If I got caught once in a while, it was nice warm rain.

    In Truckee, up in the mountains, it can snow any day of the year. I
    skiied Sugar Bowl once on the 4th of July.

    --- SoupGate-Win32 v1.05
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  • From john larkin@21:1/5 to All on Wed Jul 2 13:36:07 2025
    On Wed, 02 Jul 2025 14:34:21 -0400, Joe Gwinn <joegwinn@comcast.net>
    wrote:

    On Wed, 2 Jul 2025 13:40:56 -0400, Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote:

    On 2025-07-02 12:36, john larkin wrote:
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs
    <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
    It's a 60-V, 20-A, 2.5 MHz boost with integrated GaN FETs, and claims >[snip]

    (*) As an aside, is Accuweather as uniformly pessimistic where you are?
    In NY it's always predicting clouds and rain, which frequently don't
    show up, and when the do, usually aren't nearly so dreary as they claim.

    Yes, same in Boston (and likely everywhere), because people complain
    more about having their picnic rained out than if the warning was
    wrong.

    It doesn't rain here between March and November.

    We rarely get thunderstorms or see lightning, less than once a year.
    We get more earthquakes than thunderstorms. Pity, I used to enjoy thunderstorms.

    --- SoupGate-Win32 v1.05
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  • From Jeff Layman@21:1/5 to Liz Tuddenham on Thu Jul 3 08:51:51 2025
    On 02/07/2025 22:15, Liz Tuddenham wrote:
    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It doesn't rain here between March and November.

    It doesn't stop raining here between November and March. (...except
    when it snows.)

    That used to be the case - more or less - but not now in most of the
    south and east of England. We have near drought conditions here in south Hampshire; the total rainfall for the first 6 months of this year is
    just under 300mm:

    Jan 128.7
    Feb 72.4
    Mar 8.9
    Apr 32.3
    May 14.4
    Jun 43.0

    If you omit January, we've had seven inches of rain in five months, and
    we're not so badly off as some of those in East Anglia.

    --
    Jeff

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  • From Liz Tuddenham@21:1/5 to john larkin on Thu Jul 3 09:13:55 2025
    john larkin <jl@glen--canyon.com> wrote:

    On Wed, 2 Jul 2025 22:15:39 +0100, liz@poppyrecords.invalid.invalid
    (Liz Tuddenham) wrote:

    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It doesn't rain here between March and November.

    It doesn't stop raining here between November and March. (...except
    when it snows.)

    I had a motorcycle in New Orleans. It would reliably rain hard between
    about 1 and 3 PM most every day, but I could bike to/from work.

    If I got caught once in a while, it was nice warm rain.

    In Truckee, up in the mountains, it can snow any day of the year. I
    skiied Sugar Bowl once on the 4th of July.

    English Winter 'rain' is rarely pleasant. We tend to have long spells
    of cold drizzle that chills to the bone and eventually penetrates to the insides of houses, making them clammy and damp if they aren't heated
    well (which is very expensive). Nothing ever gets properly dry for
    weeks or even months on end.

    Dry snow is a rarity as the temperatures usually hover just above and
    just below freezing, so the snow is wet and slushy. Warm rain sometimes
    occurs - but only in Summer.


    --
    ~ Liz Tuddenham ~
    (Remove the ".invalid"s and add ".co.uk" to reply)
    www.poppyrecords.co.uk

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Bill Sloman@21:1/5 to john larkin on Thu Jul 3 13:17:38 2025
    On 3/07/2025 4:26 am, john larkin wrote:
    On Wed, 2 Jul 2025 13:40:56 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    On 2025-07-02 12:36, john larkin wrote:
    On Wed, 2 Jul 2025 01:36:04 -0000 (UTC), Phil Hobbs

    <snip>

    Megahertz GaN power is a big deal lately. They need small, low loss,
    well shielded transformers.

    Probably with nickel-zinc ferrite cores. Manganese-zinc is a bit too
    conductive for megahertz switching frequencies.

    --
    Bill Sloman, Sydney

    --- SoupGate-Win32 v1.05
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  • From john larkin@21:1/5 to Liz Tuddenham on Thu Jul 3 07:22:16 2025
    On Thu, 3 Jul 2025 09:13:55 +0100, liz@poppyrecords.invalid.invalid
    (Liz Tuddenham) wrote:

    john larkin <jl@glen--canyon.com> wrote:

    On Wed, 2 Jul 2025 22:15:39 +0100, liz@poppyrecords.invalid.invalid
    (Liz Tuddenham) wrote:

    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It doesn't rain here between March and November.

    It doesn't stop raining here between November and March. (...except
    when it snows.)

    I had a motorcycle in New Orleans. It would reliably rain hard between
    about 1 and 3 PM most every day, but I could bike to/from work.

    If I got caught once in a while, it was nice warm rain.

    In Truckee, up in the mountains, it can snow any day of the year. I
    skiied Sugar Bowl once on the 4th of July.

    English Winter 'rain' is rarely pleasant. We tend to have long spells
    of cold drizzle that chills to the bone and eventually penetrates to the >insides of houses, making them clammy and damp if they aren't heated
    well (which is very expensive). Nothing ever gets properly dry for
    weeks or even months on end.

    That explains why the English colonized India and Africa and the
    Carribean. They were cold.

    It must have been dreadful before waterproof synthetics and stuff like Thinsulate were invented. When clothing was so expensive that people
    were killed for their clothes and here were no electric dryers.

    My grammy had a wood stove and hung her wet laundry outside to dry. If
    it was cold and rainy for a few days, it got moldy stinky and had to
    be washed again. By hand. Women used to average hours per day on
    sewing and laundry.


    Dry snow is a rarity as the temperatures usually hover just above and
    just below freezing, so the snow is wet and slushy. Warm rain sometimes >occurs - but only in Summer.

    In New Orleans as kids we would put on shorts and tee shirts and go
    for barefoot walks in the rain. The puddles on the sidewalks would be
    warm water. It was fun.

    It never snows in San Francisco. My neighborhood is almost always cool
    and often foggy, when a mile away is pleasant and sunny. The gradient
    in any inland direction from my house can be as much as 2 degF per
    mile.

    The Coilcraft rep bought is sandwiches and we ate outdoors at our
    "conference room", a random cluster of old chairs and benches near the Arlington Triangle. Our theory is that outdoor meetings have better
    dynamics than in closed conference rooms. It's the eyeball effect.

    They are doing some new low-inductance low-resistance high-frequency
    inductors moulded from powdered iron instead of epoxy, for GaN type high-current switchers.

    --- SoupGate-Win32 v1.05
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  • From Liz Tuddenham@21:1/5 to john larkin on Thu Jul 3 17:56:05 2025
    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It must have been dreadful before waterproof synthetics and stuff like Thinsulate were invented.

    Wax-impregnated cotton is fairly waterproof as long as it is re-treated
    every year. Wool is good for insulation (so is fur, if you are rich),
    so the traditional combination of cotton underwear for sweat absorbtion,
    wool for insulation and waxed-cotton outer clothing for weatherproofing
    worked quite well.

    One of my most useful emergency garments is a waterproof overskirt. It
    can be worn over a skirt or trousers and can be put on by pulling it
    over your head, so it doesn't drag wet from the ground up over your
    clothes like overtrousers would. It was made from an offcut of a tent I
    was making and happens to be waterproof rip-stop nylon, but a
    lightweight waxed-cotton material would be just as effective. I don't
    know why more people don't carry them; mine takes up very little space
    in my bag.


    --
    ~ Liz Tuddenham ~
    (Remove the ".invalid"s and add ".co.uk" to reply)
    www.poppyrecords.co.uk

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Liz Tuddenham@21:1/5 to john larkin on Wed Jul 2 22:15:39 2025
    john larkin <jl@glen--canyon.com> wrote:

    [...]
    It doesn't rain here between March and November.

    It doesn't stop raining here between November and March. (...except
    when it snows.)


    --
    ~ Liz Tuddenham ~
    (Remove the ".invalid"s and add ".co.uk" to reply)
    www.poppyrecords.co.uk

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)