"high voltage" MOSFET

Looking for a MOSFET with a 100 or 150-200 (would be better), Vds 
N-channel that can switch a couple amps at a couple MHz, preferably in 
D-pak or something for ease of compact Manhattan-prototyping.

MOSFET-selection is always problematic for me there are so many and the 
parameters like temperature de-rating and how fast you can switch it at 
a given temperature all interact so it's hard to know where to start. A 
master list of a few favorite devices to run the numbers on/check in the 
sim/blow up by accident, for a set of applications/speeds/voltages that 
are people's favorites to use in their own work would be helpful, if 
anyone's got a physical or mental list or somethin'.

since you are hand soldering, I would go for a TO-220 part.  lots of parts to choose from, many probably fine.  Look at the tradeoff between Rds_on and Ciss.  You might need small Ciss since you are switching pretty fast; then keep an eye on temperature if you choose a part with higher Rds_on. It goes without saying if you are switching at 2MHz keep the leads short. 

On Friday, March 20, 2020 at 10:19:05 PM UTC-4, bitrex wrote:
> Looking for a MOSFET with a 100 or 150-200 (would be better), Vds 
> N-channel that can switch a couple amps at a couple MHz, preferably in 
> D-pak or something for ease of compact Manhattan-prototyping.

If you can keep it cool, IRFP4668 (in TO-247AC package).
One of my favorites, but influenced by the fact I have plenty on-hand.  :)

Note that it sports a rather hefty gate-charge, so be prepared to drive it hard to get that low Rds(on) quickly.  Typically .008 to .010 Ohms.

On 3/20/2020 11:13 PM, mpm wrote:
> On Friday, March 20, 2020 at 10:19:05 PM UTC-4, bitrex wrote:
>> Looking for a MOSFET with a 100 or 150-200 (would be better), Vds
>> N-channel that can switch a couple amps at a couple MHz, preferably in
>> D-pak or something for ease of compact Manhattan-prototyping.
> 
> If you can keep it cool, IRFP4668 (in TO-247AC package).
> One of my favorites, but influenced by the fact I have plenty on-hand.  :)
> 
> Note that it sports a rather hefty gate-charge, so be prepared to drive it hard to get that low Rds(on) quickly.  Typically .008 to .010 Ohms.
> 

So to hopefully helpfully clarify my needs further the application is 
like an interleaved synchronous-buck-type converter but I'm using it to 
generate a power sine wave at a couple MHz. There is a goodly amount of 
dead-time for the switches. The gate driver is an Analog Devices ADuM4120.

Just testing a few MOSFETs from the LTSpice library with fairly high 
Vds. IRFH5207, Vds 75 volts - blah! Way too slow, these will shoot-thru 
and smoke themselves instantly. no good for these speeds.

Infineon BSZ900N15NS3G, Vds 150 volts - yes, this is my ballpark. Looks 
like will drive my load and stay cool under a couple 100mW dissipation 
no problem. That laptop-motherboard style package seems a bit 
inconvenient for a copper-clad-board test item, though.

<https://www.mouser.com/Search/Refine?Keyword=BSZ900N15NS3G>

On 3/20/2020 11:02 PM, sea moss wrote:
> since you are hand soldering, I would go for a TO-220 part.  lots of parts to choose from, many probably fine.  Look at the tradeoff between Rds_on and Ciss.  You might need small Ciss since you are switching pretty fast; then keep an eye on temperature if you choose a part with higher Rds_on. It goes without saying if you are switching at 2MHz keep the leads short.
> 

Looking thru the LTSpice lib it looks like there's a set of Infineon 
parts that have Vds in the range of 100-200 volts, gate charges of about 
5-20 nC and Rds-ons in the range of about 0.2-0.5 ohms that, at least in 
the sim, look like they'll work great at this speed with my Analog 
Devices 2A isolated gate driver. The package is "PG-TSDSON-8" or "laptop 
motherboard" as I call it which is a bit inconvenient for hand soldering 
I think.

On 3/20/2020 11:45 PM, bitrex wrote:
> On 3/20/2020 11:02 PM, sea moss wrote:
>> since you are hand soldering, I would go for a TO-220 part.  lots of 
>> parts to choose from, many probably fine.  Look at the tradeoff 
>> between Rds_on and Ciss.  You might need small Ciss since you are 
>> switching pretty fast; then keep an eye on temperature if you choose a 
>> part with higher Rds_on. It goes without saying if you are switching 
>> at 2MHz keep the leads short.
>>
> 
> Looking thru the LTSpice lib it looks like there's a set of Infineon 
> parts that have Vds in the range of 100-200 volts, gate charges of about 
> 5-20 nC and Rds-ons in the range of about 0.2-0.5 ohms that, at least in 
> the sim, look like they'll work great at this speed with my Analog 
> Devices 2A isolated gate driver. The package is "PG-TSDSON-8" or "laptop 
> motherboard" as I call it which is a bit inconvenient for hand soldering 
> I think.

Even with a hot-air station once you slap it down to a sheet of 
copper-clad they're pretty hard to get off I expect if you blow it. 
Maybe tack their drain pad to risers of copper-clad and let the source 
and gate pins hang off the side.

On 3/20/2020 11:32 PM, bitrex wrote:
> On 3/20/2020 11:13 PM, mpm wrote:
>> On Friday, March 20, 2020 at 10:19:05 PM UTC-4, bitrex wrote:
>>> Looking for a MOSFET with a 100 or 150-200 (would be better), Vds
>>> N-channel that can switch a couple amps at a couple MHz, preferably in
>>> D-pak or something for ease of compact Manhattan-prototyping.
>>
>> If you can keep it cool, IRFP4668 (in TO-247AC package).
>> One of my favorites, but influenced by the fact I have plenty 
>> on-hand.  :)
>>
>> Note that it sports a rather hefty gate-charge, so be prepared to 
>> drive it hard to get that low Rds(on) quickly.  Typically .008 to .010 
>> Ohms.
>>
> 
> So to hopefully helpfully clarify my needs further the application is 
> like an interleaved synchronous-buck-type converter but I'm using it to 
> generate a power sine wave at a couple MHz. There is a goodly amount of 
> dead-time for the switches. The gate driver is an Analog Devices ADuM4120.
> 
> Just testing a few MOSFETs from the LTSpice library with fairly high 
> Vds. IRFH5207, Vds 75 volts - blah! Way too slow, these will shoot-thru 
> and smoke themselves instantly. no good for these speeds.
> 
> Infineon BSZ900N15NS3G, Vds 150 volts - yes, this is my ballpark. Looks 
> like will drive my load and stay cool under a couple 100mW dissipation 
> no problem. That laptop-motherboard style package seems a bit 
> inconvenient for a copper-clad-board test item, though.
> 
> <https://www.mouser.com/Search/Refine?Keyword=BSZ900N15NS3G>

Obviously cuz the ~0.2 ish Rds looks ok we're not talking huge output 
power requirements, here. Trading that off for lower gate charge seems 
the right way to go.

bitrex <user@example.net> wrote:
> Looking for a MOSFET with a 100 or 150-200 (would be better), Vds 
> N-channel that can switch a couple amps at a couple MHz, preferably in 
> D-pak or something for ease of compact Manhattan-prototyping.
> 

I think "serveral MHzand Ampere" contradicts and easy to handle
package. Did you have a look at the bare die GAN mosfets, like those
from EPC?
-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------

bitrex <user@example.net> wrote:
> Looking for a MOSFET with a 100 or 150-200 (would be better), Vds 
> N-channel that can switch a couple amps at a couple MHz, preferably in 
> D-pak or something for ease of compact Manhattan-prototyping.
> 

I think "serveral MHz and Ampere" and easy to handle package contradict.
Did you have a look at the bare die GAN mosfets, like those
from EPC?
-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------

bitrex wrote...
>
> Looking for a MOSFET with a 100 or 150-200 Vds 
> N-channel - switch a couple amps at a couple MHz,
> preferably in D-pak ...

 You should avoid the temptation to go big, with 
 low Rds(on).  Instead go for low Qg and low Coss.
 Power dissipation terms are f Qg Vg, f Coss Vd^2,
 and i^2 Rds(on).  It'd be good to keep Coss under
 50pF.  Looking in my giant MOSFET spreadsheet, an
 FQD5N20L looks good, Qg = 5nC with 5V gate drive, 
 Coss = 40pF, and Rds = 1-ohm, oops, a little high.
 Or maybe FDD7N20TM, Rds = 0.58 ohms, Coss = 45pF.


-- 
 Thanks,
    - Win