Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
On 3/27/2025 5:19 PM, john larkin wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
MSL 3 so buy them in onesies and twosies if you're going to prototype >perhaps.. my experience is that chips with internal isolation barriers
are very sensitive if they get waterlogged, not just reflow but even hot
air or hand soldering may wreck them if they've sat out too long.
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid <martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN totem-pole driver and want a floating power supply for the high side,
but I want very low switching noise for low jitter on the rising edge.
I might try one of these with a bunch of added filtering. It might be
better than some dc/dc that works in the 100 KHz sort of ballpark.
Or it might be much worse.
john larkin <jl@glen--canyon.com> wrote:
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN
totem-pole driver and want a floating power supply for the high side,
but I want very low switching noise for low jitter on the rising edge.
I might try one of these with a bunch of added filtering. It might be
better than some dc/dc that works in the 100 KHz sort of ballpark.
Or it might be much worse.
I bet the gain bandwidth of a GaN FET in its linear range at high current
is pretty impressive.
Im using SiGe BJTs to speed up the edges of my TDR pulse generators.
Driven from a 500-ps comparator edge, its fast enough to oscillate on the >falling edge if the layout isnt right. Thatll make really entertaining >jitter.
Cheers ?
Phil Hobbs
On Sat, 29 Mar 2025 16:30:23 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN
totem-pole driver and want a floating power supply for the high side,
but I want very low switching noise for low jitter on the rising edge.
I might try one of these with a bunch of added filtering. It might be
better than some dc/dc that works in the 100 KHz sort of ballpark.
Or it might be much worse.
I bet the gain bandwidth of a GaN FET in its linear range at high current
is pretty impressive.
Im using SiGe BJTs to speed up the edges of my TDR pulse generators.
Driven from a 500-ps comparator edge, its fast enough to oscillate on the >> falling edge if the layout isnt right. Thatll make really entertaining >> jitter.
Cheers ?
Phil Hobbs
One part that I like is the EPC2037, the tiny BGA thing. I think you
have used it too.
Transconductance is about 1.5S and it's on hard by 3 volts on the
gate. Capacitances are absurdly low compared to a silicon mosfet...
reverse transfer is 0.1 pF.
But a little noise on the gate drive will surely jitter the output.
I never had much luck getting bipolars to make fast output edges, but
I haven't tried SiGe.
That tiny EPC thing is rated for 100 volts and can conduct 2 amps!
john larkin <jlArbor.com> wrote:
On Sat, 29 Mar 2025 16:30:23 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN
totem-pole driver and want a floating power supply for the high side,
but I want very low switching noise for low jitter on the rising edge. >>>>
I might try one of these with a bunch of added filtering. It might be
better than some dc/dc that works in the 100 KHz sort of ballpark.
Or it might be much worse.
I bet the gain bandwidth of a GaN FET in its linear range at high current >>> is pretty impressive.
I?m using SiGe BJTs to speed up the edges of my TDR pulse generators.
Driven from a 500-ps comparator edge, it?s fast enough to oscillate on the >>> falling edge if the layout isn?t right. That?ll make really entertaining >>> jitter.
Cheers ?
Phil Hobbs
One part that I like is the EPC2037, the tiny BGA thing. I think you
have used it too.
Transconductance is about 1.5S and it's on hard by 3 volts on the
gate. Capacitances are absurdly low compared to a silicon mosfet...
reverse transfer is 0.1 pF.
But a little noise on the gate drive will surely jitter the output.
I never had much luck getting bipolars to make fast output edges, but
I haven't tried SiGe.
I get about 30-40 ps falling edges, which are all that matter for TDR. The >rising edges arent nearly as good, because Im saturating the poor thing >completely. Its a 65 GHz transistor, though, so even an edge like that
has room for a snivet.
That tiny EPC thing is rated for 100 volts and can conduct 2 amps!
Yup, a very nice part. I use it in my ultrafast temperature controller,
which I call a thermal Faraday shield. ?? (Details forthcoming when the >patent gets filed.)
Cheers
Phil Hobbs
On Sat, 29 Mar 2025 20:22:48 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jlArbor.com> wrote:
On Sat, 29 Mar 2025 16:30:23 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It >>>>>>> switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN >>>>> totem-pole driver and want a floating power supply for the high side, >>>>> but I want very low switching noise for low jitter on the rising edge. >>>>>
I might try one of these with a bunch of added filtering. It might be >>>>> better than some dc/dc that works in the 100 KHz sort of ballpark.
Or it might be much worse.
I bet the gain bandwidth of a GaN FET in its linear range at high current >>>> is pretty impressive.
I?m using SiGe BJTs to speed up the edges of my TDR pulse generators.
Driven from a 500-ps comparator edge, it?s fast enough to oscillate on the >>>> falling edge if the layout isn?t right. That?ll make really entertaining >>>> jitter.
Cheers ?
Phil Hobbs
One part that I like is the EPC2037, the tiny BGA thing. I think you
have used it too.
Transconductance is about 1.5S and it's on hard by 3 volts on the
gate. Capacitances are absurdly low compared to a silicon mosfet...
reverse transfer is 0.1 pF.
But a little noise on the gate drive will surely jitter the output.
I never had much luck getting bipolars to make fast output edges, but
I haven't tried SiGe.
I get about 30-40 ps falling edges, which are all that matter for TDR. The >> rising edges arent nearly as good, because Im saturating the poor thing >> completely. Its a 65 GHz transistor, though, so even an edge like that
has room for a snivet.
That tiny EPC thing is rated for 100 volts and can conduct 2 amps!
Yup, a very nice part. I use it in my ultrafast temperature controller,
which I call a thermal Faraday shield. ?? (Details forthcoming when the
patent gets filed.)
Cheers
Phil Hobbs
I use the 2037 and 2038 in the output stage of our DDG
https://highlandtechnology.com/Product/P500
which was a lot of work.
john larkin <jlArbor.com> wrote:
On Sat, 29 Mar 2025 20:22:48 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jlArbor.com> wrote:
On Sat, 29 Mar 2025 16:30:23 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
john larkin <jl@glen--canyon.com> wrote:
On Fri, 28 Mar 2025 16:49:23 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:
john larkin <jl@glen--canyon.com> Wrote in message:r
Check out UCC33420. It's a tiny cheap isolated dc/dc converter. It >>>>>>>> switches at 64 MHz!
Why does it have such poor esd ratings?
The ucc33421 is better, but not 15kv.
Cheers
Right now I dodn't need kilovolts of isolation. I want to make a GaN >>>>>> totem-pole driver and want a floating power supply for the high side, >>>>>> but I want very low switching noise for low jitter on the rising edge. >>>>>>
I might try one of these with a bunch of added filtering. It might be >>>>>> better than some dc/dc that works in the 100 KHz sort of ballpark. >>>>>>
Or it might be much worse.
I bet the gain bandwidth of a GaN FET in its linear range at high current >>>>> is pretty impressive.
I?m using SiGe BJTs to speed up the edges of my TDR pulse generators. >>>>> Driven from a 500-ps comparator edge, it?s fast enough to oscillate on the
falling edge if the layout isn?t right. That?ll make really entertaining >>>>> jitter.
Cheers ?
Phil Hobbs
One part that I like is the EPC2037, the tiny BGA thing. I think you
have used it too.
Transconductance is about 1.5S and it's on hard by 3 volts on the
gate. Capacitances are absurdly low compared to a silicon mosfet...
reverse transfer is 0.1 pF.
But a little noise on the gate drive will surely jitter the output.
I never had much luck getting bipolars to make fast output edges, but
I haven't tried SiGe.
I get about 30-40 ps falling edges, which are all that matter for TDR. The >>> rising edges aren?t nearly as good, because I?m saturating the poor thing >>> completely. It?s a 65 GHz transistor, though, so even an edge like that >>> has room for a snivet.
That tiny EPC thing is rated for 100 volts and can conduct 2 amps!
Yup, a very nice part. I use it in my ultrafast temperature controller,
which I call a thermal Faraday shield. ?? (Details forthcoming when the
patent gets filed.)
Cheers
Phil Hobbs
I use the 2037 and 2038 in the output stage of our DDG
https://highlandtechnology.com/Product/P500
which was a lot of work.
I believe that. Did you get one for your bench?
Cheers
Phil Hobbs
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
On 30 Mar 2025 21:43:28 GMT, Uwe Bonnes <bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
https://www.dropbox.com/scl/fo/w90gg474w9h0wsqkbpd9e/AC8Oh-LB9La9PcvIGGOYWtg?rlkey=agwx067u5vk6z04ir2ktp4dy0&dl=0
john larkin <jlArbor.com> wrote:
On 30 Mar 2025 21:43:28 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
...
And MPS MIE1Wxx?
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
On 30 Mar 2025 21:43:28 GMT, Uwe Bonnes <bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
...
On 30 Mar 2025 21:43:28 GMT, Uwe Bonnes <bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
https://www.dropbox.com/scl/fo/w90gg474w9h0wsqkbpd9e/AC8Oh-LB9La9PcvIGGOYWtg?rlkey=agwx067u5vk6z04ir2ktp4dy0&dl=0
On 31-03-2025 01:37, john larkin wrote:
On 30 Mar 2025 21:43:28 GMT, Uwe BonnesThat vertical relative to the PCB winding structure is really nice.
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
https://www.dropbox.com/scl/fo/w90gg474w9h0wsqkbpd9e/AC8Oh-LB9La9PcvIGGOYWtg?rlkey=agwx067u5vk6z04ir2ktp4dy0&dl=0
Solved problems with clearances.
If only I could have a PCB manufactorer do that, but maybe it's out there.
Murata is 3.11mm PCB. Could be done with 2 1.6mm PCBs, and pocket
milling, turned over, plopping in a ferrite, glue, and solder.
But, do they make the vias after the ferrite has been sandwiched?
On Fri, 4 Apr 2025 23:48:53 +0200, Klaus Kragelund
<klauskvik@hotmail.com> wrote:
On 31-03-2025 01:37, john larkin wrote:
On 30 Mar 2025 21:43:28 GMT, Uwe BonnesThat vertical relative to the PCB winding structure is really nice.
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
About 100 KHz.
https://www.dropbox.com/scl/fo/w90gg474w9h0wsqkbpd9e/AC8Oh-LB9La9PcvIGGOYWtg?rlkey=agwx067u5vk6z04ir2ktp4dy0&dl=0
Solved problems with clearances.
If only I could have a PCB manufactorer do that, but maybe it's out there. >>
Murata is 3.11mm PCB. Could be done with 2 1.6mm PCBs, and pocket
milling, turned over, plopping in a ferrite, glue, and solder.
But, do they make the vias after the ferrite has been sandwiched?
Seems to me that they have to. It's an ordinary PCB fab process,
except there's that ferrite inside the board first.
The vent hole on the side is interesting. Why not squirt in ferrite
paste, or 3D print the core?
There are several people now who are integrating the isolation
transformer into a single IC somehow.
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
On 30-03-2025 23:43, Uwe Bonnes wrote:
john larkin <jl@glen--canyon.com> wrote:
Check out UCC33420.
It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz!
I guess Murata NXJ switches at a similar frequency!
Wont they get in trouble with conducted emissions, since only a very
small parasitic capacitance from primary to secondary is able to push a
lot of current at 64MHz?
And MPS MIE1Wxx?
Do you use that one? It looks tiny, cheap, noisy, and inefficient but
would be fine for many uses. It would be interesting to x-ray.
By the reel, it's 89 cents!
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