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Old 13th March 2012, 04:09 PM   #21
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Quote:
Originally Posted by pieter t View Post
I know Andrew; I guess that homemodder should look at bias voltages required for the output transistors.
I know what the voltage requirements are for the output transistors, I want to know whether the chip can supply these voltages. See post 12.

Lme49830 is 16v, enough to drive any mosfets including high VT ones. Lm49811 Vbias ???
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Old 14th March 2012, 12:36 PM   #22
Buslik is offline Buslik  Belgium
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As far as I understood gate-to-gate voltage of 2SK1058/2SJ162 should be around 3v. And this is in range of specs for LME4981.
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Old 14th March 2012, 01:11 PM   #23
AndrewT is offline AndrewT  Scotland
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3V when passing no output current.
When substantial output current is passed, the Gate to gate voltage is very much higher. This is due to the low transconductance of the Lateral FETs.

When high output current is used for the comparison, you will find that VFETs and LFETs have a similarly high gate to gate voltage requirement.

BJTs in this high current scenario do not require anywhere near those as base to base voltages. That's why the 830 was designed specifically for mosFETs in the output stage.
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Old 14th March 2012, 01:14 PM   #24
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What might work here is 2sj200/2sk1530.
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Old 15th March 2012, 02:45 AM   #25
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Quote:
Originally Posted by Buslik View Post
Any case advices?
Get them from China.
Siliconray makes ones that I like.
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