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Old 13th March 2012, 12:10 PM   #11
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Quote:
Originally Posted by homemodder View Post
True. The bias voltage parameter for this chip is not given ....??
It's all in the LME49811 datasheet
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Old 13th March 2012, 12:40 PM   #12
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Another quick look and Vbias not stated on datasheet. For 49830 it is. Offcourse it can be calculated but Im lazy.
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Old 13th March 2012, 01:07 PM   #13
Buslik is offline Buslik  Belgium
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Any case advices?
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Old 13th March 2012, 02:02 PM   #14
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For mosfets rather use the lme49830. For higher performance with the mosfets use small drivers. National application note 1645 gives some valuable tips.
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Old 13th March 2012, 02:07 PM   #15
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Quote:
Originally Posted by homemodder View Post
Another quick look and Vbias not stated on datasheet. For 49830 it is. Offcourse it can be calculated but Im lazy.
Maybe a bit slower look?
It's really there, even with different + and - supply voltages.
But as you are lazy: output swing is 33 VRMS with +/- 50 volt rails, and 68 VRMS with +/- 100 volt rails.
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Old 13th March 2012, 02:18 PM   #16
AndrewT is offline AndrewT  Scotland
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The base to base, or gate to gate, bias voltage is not the same as the output swing.
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Old 13th March 2012, 02:26 PM   #17
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Where's SpittinLama when you need him? There's a chart of THD% vs bias current in the LME49830 data sheet. Best advice I can give is that the lateral MOSFETs don't need thermal compensation which is a big design simplification, secondly -- if you tweak the values of the gate stoppers on the MOSFETs you can reduce the THD% (which is already quite good.) This is illustrated in AN-1645. There was going to be another paper/application note on the compensation techniques for this series of drivers, but National decided to channel their resources toward solar power/alternative energy chips before that bubble blew up, and they got swallowed by Texas Instruments in the interim.
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Old 13th March 2012, 02:41 PM   #18
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Originally Posted by AndrewT View Post
The base to base, or gate to gate, bias voltage is not the same as the output swing.
I know Andrew; I guess that homemodder should look at bias voltages required for the output transistors. That has not so much to do with voltage swing of the driver. Important though is output current of the driver (is the driver capable of driving the input capacitance of the output device, where fets generally show higher input capacitance than BJT's - hence the LME49830 with it's much higher output current meant to drive fets).
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Old 13th March 2012, 02:41 PM   #19
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Interesting, TMC perhaps ??
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Old 13th March 2012, 02:44 PM   #20
AndrewT is offline AndrewT  Scotland
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FETs are reputed to have similar capacitance drive requirement to BJTs.

The BJTs also need current drive for the base.
Generally this makes the drive requirement for BJTs more onerous.
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