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Old 30th April 2011, 04:00 PM   #11
Stee is offline Stee  Italy
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Default maybe is better start

to make experiment with an easy circuit
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Old 30th April 2011, 10:08 PM   #12
ilimzn is offline ilimzn  Croatia
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Very easy and very wishful thinking!
What sets the bias current of the output transistors and what keeps it thermally stable? And NO it's not simple substituting a Toshiba made-for-audio P-trench MOSFET with an IGBT 'just so'.
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Old 1st May 2011, 07:26 AM   #13
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Quote:
Originally Posted by ilimzn View Post
Very easy and very wishful thinking!
What sets the bias current of the output transistors and what keeps it thermally stable? And NO it's not simple substituting a Toshiba made-for-audio P-trench MOSFET with an IGBT 'just so'.
high values of source- (emitter-) resistors and large amount devices in parallel could be the right solution.
Because there is no possibility in variation of the internal source resistor of the IGBT (and thus no predictable current distribution between the MOSFET part and the BjT part), I would avoid this kind of power device.
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