Motorola's new approach arround 1977 - serial cascaded power devices instead very special BjT's with High Voltage UCE
In the German magazine "Funkschau" issue 4/1977, page 61/161 I read the article
"Reihengekoppelte Ausgangsstufe ermöglicht hohe Leistung bei niederigen Kosten" Translate:
Cascaded Power Follower allows High Power and Low Cost at the same Time
A serious option to (often hard to find) high voltage power devices (and also VAS medium power) transistors with not very favorable parameters.
Here my translation from German language:
In opposite to a normal cascode - i. e. fix voltage for the lower transistor - it is to see instead the typical zener also a resistor (see attachement). But similar to the normal cascode, the lower transistor is to be drive while the upper works as a slave. Because the bias voltage (0,5 UCC) corresponds to half the supply voltage UCC , UCE from upper and lower transistor always has the same value. This concept was developed in Motorola's European consumer laboratory
For this approach Motorola has developed a very special series of power devices with very high hfe (>20 at 10A).
There are three Uce groups:
1) 50V: BD364/365
2) 60V: BD366/367
3) 80V: BD368/369
The number of cascaded series devices is of course not limited to two pcs.
I want to have the original application paper from Motorola.
In the German magazine "Funkschau" issue 4/1977, page 61/161 I read the article
"Reihengekoppelte Ausgangsstufe ermöglicht hohe Leistung bei niederigen Kosten" Translate:
Cascaded Power Follower allows High Power and Low Cost at the same Time
A serious option to (often hard to find) high voltage power devices (and also VAS medium power) transistors with not very favorable parameters.
Here my translation from German language:
In opposite to a normal cascode - i. e. fix voltage for the lower transistor - it is to see instead the typical zener also a resistor (see attachement). But similar to the normal cascode, the lower transistor is to be drive while the upper works as a slave. Because the bias voltage (0,5 UCC) corresponds to half the supply voltage UCC , UCE from upper and lower transistor always has the same value. This concept was developed in Motorola's European consumer laboratory
For this approach Motorola has developed a very special series of power devices with very high hfe (>20 at 10A).
There are three Uce groups:
1) 50V: BD364/365
2) 60V: BD366/367
3) 80V: BD368/369
The number of cascaded series devices is of course not limited to two pcs.
I want to have the original application paper from Motorola.
Attachments
Last edited:
Various Threads about High Voltage Transistors
http://www.diyaudio.com/forums/soli...ver-stages-high-power-amplifier-overview.html
http://www.diyaudio.com/forums/solid-state/112227-about-vas-drivers-transistors.html
http://www.diyaudio.com/forums/soli...0-bd159-gbp-transit-frequency-ft-unknown.html
http://www.diyaudio.com/forums/solid-state/169783-its-2010-whats-your-fav-vas-transistor.html
http://www.diyaudio.com/forums/solid-state/66234-vas-transistors.html
http://www.diyaudio.com/forums/solid-state/168851-transistor-data-sorting-2.html#post2238038
http://www.diyaudio.com/forums/soli...ver-stages-high-power-amplifier-overview.html
http://www.diyaudio.com/forums/solid-state/112227-about-vas-drivers-transistors.html
http://www.diyaudio.com/forums/soli...0-bd159-gbp-transit-frequency-ft-unknown.html
http://www.diyaudio.com/forums/solid-state/169783-its-2010-whats-your-fav-vas-transistor.html
http://www.diyaudio.com/forums/solid-state/66234-vas-transistors.html
http://www.diyaudio.com/forums/solid-state/168851-transistor-data-sorting-2.html#post2238038
Most of the useful VAS transistors from my line up about
http://www.diyaudio.com/forums/soli...ver-stages-high-power-amplifier-overview.html
are obsolete, particularly the SANYO ones. Therefore I still looking for the mentioned Motorola application note from post #1.
http://www.diyaudio.com/forums/soli...ver-stages-high-power-amplifier-overview.html
are obsolete, particularly the SANYO ones. Therefore I still looking for the mentioned Motorola application note from post #1.
Any news?Motorola's new approach arround 1977 - serial cascaded power devices instead very special BjT's with High Voltage UCE
In the German magazine "Funkschau" issue 4/1977, page 61/161 I read the article
"Reihengekoppelte Ausgangsstufe ermöglicht hohe Leistung bei niederigen Kosten" Translate:
Cascaded Power Follower allows High Power and Low Cost at the same Time
A serious option to (often hard to find) high voltage power devices (and also VAS medium power) transistors with not very favorable parameters.
Here my translation from German language:
In opposite to a normal cascode - i. e. fix voltage for the lower transistor - it is to see instead the typical zener also a resistor (see attachement). But similar to the normal cascode, the lower transistor is to be drive while the upper works as a slave. Because the bias voltage (0,5 UCC) corresponds to half the supply voltage UCC , UCE from upper and lower transistor always has the same value. This concept was developed in Motorola's European consumer laboratory
For this approach Motorola has developed a very special series of power devices with very high hfe (>20 at 10A).
There are three Uce groups:
1) 50V: BD364/365
2) 60V: BD366/367
3) 80V: BD368/369
The number of cascaded series devices is of course not limited to two pcs.
I want to have the original application paper from Motorola.
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