IGBT amplifier?

[Chaos Master]

Hey people,

Does someone here knows if is it possible to make an audio amplifier using
IGBT's (Insulated Gate Bipolar Transistor)?

If yes, is there any web page about IGBT amplifiers?

Thanks!

--
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___|_____| irc.brasnet.org #XLinuxNews #POA

 

[Chaos Master]

Quotin' Quotin' Quotin' Jeff Liebermann:

On Sun, 28 Mar 2004 22:06:28 -0300, Chaos Master <a@yahoo.com> wrote:

Does someone here knows if is it possible to make an audio amplifier using
IGBT's (Insulated Gate Bipolar Transistor)?

If yes, is there any web page about IGBT amplifiers?

Google found several by simply searching for "igbt audio amplifier"
http://digilander.libero.it/essentialaudio/unetto_home.htm

http://tatooine.fortunecity.com/slaine/152/doc/igbt_audio_amplifier.jpg
http://www.audioxpress.com/bksprods/books/bkee38.htm

Interesting. I'll take a look. Thanks

--
_____ ___ Chaos MasterŽ
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[Ken Smith]

In article <c47spg$2fqjmr$2@ID-88878.news.uni-berlin.de>,
Chaos Master <renan.birck.REMOVE-ALL-IN-CAPS@ibestvip.com.br> wrote:

Hey people,

Does someone here knows if is it possible to make an audio amplifier using
IGBT's (Insulated Gate Bipolar Transistor)?

Yes, many of the newer IGBTs are fast enough to make audio bandwidth class
D power amplifiers out of. Im sure that if you google on ' "class D" IGBT
audio ' you'd find something in the links useful.

IGBTs really-really hate running in linear mode. All the electrons get
together and charge (pun) though one bit of silicon. This is a bad thing.


--
--
kensmith@rahul.net forging knowledge

 

[Terry Given]

"Ken Smith" <kensmith@violet.rahul.net> wrote in message
news:c47vm8$q77$1@blue.rahul.net...

In article <c47spg$2fqjmr$2@ID-88878.news.uni-berlin.de>,
Chaos Master <renan.birck.REMOVE-ALL-IN-CAPS@ibestvip.com.br> wrote:
Hey people,

Does someone here knows if is it possible to make an audio amplifier
using
IGBT's (Insulated Gate Bipolar Transistor)?

Yes, many of the newer IGBTs are fast enough to make audio bandwidth class
D power amplifiers out of. Im sure that if you google on ' "class D" IGBT
audio ' you'd find something in the links useful.

IGBTs really-really hate running in linear mode. All the electrons get
together and charge (pun) though one bit of silicon. This is a bad thing.

kensmith@rahul.net forging knowledge

In the Analog Devices 1993 Applications reference Manual, AN211 "The
Alexander Current-Feedback Audio Power Amplifier" describes a LINEAR IGBT
amplifier, built using N- and P-channel IGBTs. The problem is buying
them.....

 

[Winfield Hill]

Jeff Liebermann wrote...

Chaos Master wrote:

Does someone here knows if is it possible to make an audio
amplifier using IGBT's (Insulated Gate Bipolar Transistor)?

Google found several by simply searching for "igbt audio amplifier"
http://digilander.libero.it/essentialaudio/unetto_home.htm

UGH!

http://tatooine.fortunecity.com/slaine/152/doc/igbt_audio_amplifier.jpg

Yes, very nice. Using Toshiba's unusual GT20D101 and --201
complementary IGBTs, which are rated at 250V 20A and 180W (for
an impossible, theoretical 25C heatsink). Cetainly practical
for use in John Linsley Hood's nice 80W amplifier design.

http://www.audioxpress.com/bksprods/books/bkee38.htm
(etc...etc...etc...)

What's in the Elektor Electronics Magazine's "Build Your Own
High-End Audio Equipment" that's relevant to IGBT amplifiers?

Thanks,
- Win

whill_at_picovolt-dot-com

 

[Chaos Master]

Quotin' Quotin' Quotin' Winfield Hill:

http://tatooine.fortunecity.com/slaine/152/doc/igbt_audio_amplifier.jpg

Yes, very nice. Using Toshiba's unusual GT20D101 and --201
complementary IGBTs, which are rated at 250V 20A and 180W (for
an impossible, theoretical 25C heatsink). Cetainly practical
for use in John Linsley Hood's nice 80W amplifier design.

This gave me a FortuneCity "logo" instead of a schematic.

--
_____ ___ Chaos MasterŽ
| | Posting from Brazil
| | MSN: wizard_of_yendor at hotmail.com
___|_____| irc.brasnet.org #XLinuxNews #POA

 

[Ban]

Chaos Master wrote:

Hey people,

Does someone here knows if is it possible to make an audio amplifier
using IGBT's (Insulated Gate Bipolar Transistor)?

If yes, is there any web page about IGBT amplifiers?

Thanks!

I do not think an IGBT has any advantage over plain Mosfets for audio use.
The only plus of IGBTs is their high voltage rating, you actually find them
only in 600V and 1200V. The downside is the much higher saturation voltage
(>2...3V) which results in higher losses and heat sinking problems,
especially for the high currents needed in audio apps. This applies to
analog as well as digital circuits.
--
ciao Ban
Bordighera, Italy

 

[Fred Bartoli]

"Winfield Hill" <Winfield_member@newsguy.com> a écrit dans le message news:
c482ut0291r@drn.newsguy.com...
<snip>

http://tatooine.fortunecity.com/slaine/152/doc/igbt_audio_amplifier.jpg

Yes, very nice. Using Toshiba's unusual GT20D101 and --201
complementary IGBTs, which are rated at 250V 20A and 180W (for
an impossible, theoretical 25C heatsink). Cetainly practical
for use in John Linsley Hood's nice 80W amplifier design.

Question :
How can one tell it's an IGBT amplifier without looking at the schematics ?

Answer :
Because the waveforms are quite unusual ;-)

Thanks,
Fred.

 

[Winfield Hill]

Ban wrote...

Chaos Master wrote:

Does someone here knows if is it possible to make an audio amplifier
using IGBT's (Insulated Gate Bipolar Transistor)?

I do not think an IGBT has any advantage over plain Mosfets for audio
use. The only plus of IGBTs is their high voltage rating, you actually
find them only in 600V and 1200V. The downside is the much higher
saturation voltage (>2...3V) which results in higher losses and heat
sinking problems, especially for the high currents needed in audio apps.
This applies to analog as well as digital circuits.

Another serious downside is a lack of p-channel IGBTs. The Toshiba
part used in both Alexander's and Hood's amplifiers (the GT20D201, a
250V 20A TO-264 monster) is the only one I'm familiar with, assuming
it's still available. Harris discontinued their HGTD8P50G1, a small
500V 8A part. Zetex' ZCP0545A, a small 450V 0.3A TO-92 part, is gone.

Thanks,
- Win

whill_at_picovolt-dot-com

 

[Winfield Hill]

Ban wrote...

Chaos Master wrote:

Does someone here knows if is it possible to make an audio amplifier
using IGBT's (Insulated Gate Bipolar Transistor)?

I do not think an IGBT has any advantage over plain Mosfets for audio
use. The only plus of IGBTs is their high voltage rating, you actually
find them only in 600V and 1200V. The downside is the much higher
saturation voltage (>2...3V) which results in higher losses and heat
sinking problems, especially for the high currents needed in audio apps.
This applies to analog as well as digital circuits.

Another serious downside is a lack of p-channel IGBTs. The Toshiba
part used in both Alexander's and Hood's amplifiers (the GT20D201, a
250V 20A TO-264 monster) is the only one I'm familiar with, assuming
it's still available. Harris discontinued their HGTD8P50G1, a small
500V 8A part. Zetex' ZCP0545A, a small 450V 0.3A TO-92 part, is gone.

Thanks,
- Win

whill_at_picovolt-dot-com

 

[Winfield Hill]

Winfield Hill wrote...

Another serious downside is a lack of p-channel IGBTs.

sorry for the double-post, a little ISP screwup...

Thanks,
- Win

whill_at_picovolt-dot-com