Automotive MOSFET...Something for motor drivers.
This recalls me the tales of certain tubes which are massive used as voltage regulators in 1940s, become "ultimate" audio devices now.
(Of course,540 is also something for voltage regulators.)
dv/dt...A MOTOROLA appnotes in 1990s said that reverse recovery faliure are NOT caused by dv/dt.
This recalls me the tales of certain tubes which are massive used as voltage regulators in 1940s, become "ultimate" audio devices now.
(Of course,540 is also something for voltage regulators.)
dv/dt...A MOTOROLA appnotes in 1990s said that reverse recovery faliure are NOT caused by dv/dt.
Well, as for mosfets, I guess Bruno beat me to the punch by another thread he just started, but I was going to comment that PC motherboards (with which I work on a daily basis) feature mosfets that are optimized for this kind of thing, and are usually SMD. From what I gather from JohnW's designs he uses SMD mosfets almost exclusively.
Also the output coils etc. are readily available in very small packaging. Keep in mind that a modern Pentium 4 or Athlon-64 processor consumes about 100-watts at core voltages of about 1.5-volts. This is derived from the 3.3 and 5-volts lines of the main PSU by a dual or triple phase switching powersupply with usually four or six mosfets sinking to the pcb, thus having very little dissipation, that's quite a feat considering the peak currents are over 100A.
Just a thought really, but I'd be happy to glance over a few motherboards and note a few mosfet types if needed.
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
Also the output coils etc. are readily available in very small packaging. Keep in mind that a modern Pentium 4 or Athlon-64 processor consumes about 100-watts at core voltages of about 1.5-volts. This is derived from the 3.3 and 5-volts lines of the main PSU by a dual or triple phase switching powersupply with usually four or six mosfets sinking to the pcb, thus having very little dissipation, that's quite a feat considering the peak currents are over 100A.
Just a thought really, but I'd be happy to glance over a few motherboards and note a few mosfet types if needed.
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
The CPU power supply are Buck regulators--class D producing DC power-- running at 500KHz and meet diode reverse recovery problems. So the device are fully designed to fight against diode reverse recovery problems.
Nowadays the whole power regulator industry are advertising on "quick transient response" or "ultimate transient response" . Maybe some of them are suitable for audio use (or even faster)
At least TI have a gate driver with self-adapted dead time and NSC have a controller based on hysteresis scheme.
The only problem is the loudspeaker . How to get a loudspeaker with impedance < 1ohm?
DIY it with a big Nd-Fe-B magnet plus a thin, big aluminium film ?
The old,middle school experimentcome back to life : a wire between two magnets...which is once considered to have too low impedance...
Maybe we can design some motor in the middle-school way and drive it with MOSFET use a single big battery...The tales of Nautilius: A submarine powered by a single Na:Hg-water battery.
Nowadays the whole power regulator industry are advertising on "quick transient response" or "ultimate transient response" . Maybe some of them are suitable for audio use (or even faster)
At least TI have a gate driver with self-adapted dead time and NSC have a controller based on hysteresis scheme.
The only problem is the loudspeaker . How to get a loudspeaker with impedance < 1ohm?
DIY it with a big Nd-Fe-B magnet plus a thin, big aluminium film ?
The old,middle school experimentcome back to life : a wire between two magnets...which is once considered to have too low impedance...
Maybe we can design some motor in the middle-school way and drive it with MOSFET use a single big battery...The tales of Nautilius: A submarine powered by a single Na:Hg-water battery.
I don`t understand, is there a problem to put small capacitive/low charge shottky diode between drain and source of output mosfet? I.e. SR1100 (1A/100V) for IRF540* ?
There is no need for large current capability fot these diodes and they can be mount directly to mosfet`s legs
There is no need for large current capability fot these diodes and they can be mount directly to mosfet`s legs
Hi Kanwar,
That's very cool! Nice to see there's a reference too. Thanks.
Thanks for posting it.
Regards,
Chris
That's very cool! Nice to see there's a reference too. Thanks.
Thanks for posting it.
Regards,
Chris
kartino said:
You're right 🙂 There's also other errors.
Copying and pasting is getting harder for students these days it seems.
Well, at least the thread was referenced.
Best Regards,
Chris
hi classd4sure any updates? can this amp be modified to use irf640 and +/-65vlts?
http://forcedgifting.com/?ref=stewin
http://forcedgifting.com/?ref=stewin
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With beefed up drivers, sure. Can't give you any detailed pointers though - my boss would be annoyed.
I'm sorry? By 'is no more' you mean he's no longer a member of this forum, or that he's no longer among the living? In the latter case I would appreciate having his contact info as I need to send his family my sincere condolences.
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