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21st December 2006, 02:31 AM
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#1 |
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diyAudio Member
Join Date: Jul 2003
Location: Israel , haifa
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new thermal trak transistors
from on semi...
http://www.onsemi.com/PowerSolutions...tem.do?id=1218 did somebody tried those allready?
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if you are not living on the edge you are taking too much space 
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21st December 2006, 06:31 PM
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#3 |
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diyAudio Member
Join Date: Apr 2003
Location: Copenhagen, Denmark
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They sound good, and with the thermal diodes in the bias circuit, the amps stays very stable
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com |
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21st December 2006, 07:06 PM
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#4 |
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Account Disabled
Join Date: Jun 2004
Location: Animal farm
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A Missed Opportunity.
What OnSemi ought to have done is include another transistor on the same substrate as the power device for biasing with a Vbe-multiplier.
Then the things would probably have sold like hot cakes. |
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21st December 2006, 07:29 PM
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#5 | |
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diyAudio Member
Join Date: Sep 2002
Location: near Milano , Italy
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Quote:
I ask because at a quick glance the SAPs have several diodes integrated while ONSemi's seem to have just a diode and thus (like in their application note) there seems to be the need of multiple devices to achieve a correct polarization of the output stage... Cheers Andrea
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I don't believe in audiophile components - except when I can get them at frugal-phile(tm) prices
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21st December 2006, 08:11 PM
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#6 | |
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diyAudio Member
Join Date: Nov 2006
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Quote:
It's not strictly necessary. Diodes embedded in onsemi devices may be used as a sensor for a second circuit (just the usual VBE mult a bit rearranged) that really "track" the idle current against temperature. However is a very niceful idea! With appropriate circuit this device may really help to keep at minimun crossover distortion in Class AB amplifier especially when the output devices are the only that commute on zero crossing and when driver and predriver stages are keep in a continous conduction state (really a kind of non linear class A).Normally, if crossover is restricted to the effective power devices, crossover distortion - in well trimmed amplifier of couse! - became hardly detectable without measurement. If bias control tracking with temperature is thermally improved as Onsemi device promises, crossover may became hardly detectable *even* with instrumental measurement. May be a real improvement toward theoretical minima of crossover distortion (for bipolar devices at least) without excessive entanglement of output stage topologies. Ciao Piercarlo |
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21st December 2006, 08:23 PM
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#7 |
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diyAudio Member
Join Date: Dec 2004
Location: Next door
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Mikeks
---What OnSemi ought to have done is include another transistor on the same substrate as the power device for biasing with a Vbe-multiplier.--- A dream for amplifier engineers since more than thirty years. Manufacturers seem to have the worst difficulities to understand it. At last they are on the right way, but still far from the real demand. |
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21st December 2006, 08:23 PM
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#8 |
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diyAudio Member
Join Date: Sep 2005
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21st December 2006, 08:55 PM
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#9 | ||
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diyAudio Member
Join Date: Aug 2002
Location: Right here
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Quote:
Quote:
One 10uF Cap! I've used OnSemi schematic, only from VAS to output. I've used a differential pair with current mirrors at the input. |
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21st December 2006, 09:09 PM
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#10 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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I don't believe additional diodes would help them to compete against Toshiba.
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