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Old 17th June 2011, 12:24 PM   #1
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Default LME49811 + 2SK1529/2SJ200

EDIT:

After getting the bias circuitry working correctly (many thanks to all the members here), this one has evolved to quite an extraordinary little amplifier during the past few years.
So I decided to revisit this thread and post the most recent updates and show how it all looks like today.

Circuit on post #6 updated.
For 100W Class-AB output (8R);
use +/-48V supplies and adjust bias down to 150mA!
THD 1kHz8R is less than 0.001% (with the Toshibas...).

Click the image to open in full size.

Here is also a "universal" LME49811 PCB which you can use.
Click the image to open in full size.

There is no reason for not using this one for Darlington output pairs as well. Just replace RB3 with a jumper and adjust Gate (Base) resistors accordingly (start with zero ohms for example).
I actually tested a MJH11021/22 pair with this. I had to change the bias transistor to a darlington type and change Rp to 1kohm and RB1 to 1.2kohm to keep the bias stable and adjustable in a good range.
I used BD681 as Qvbe. But you might want to experiment with that (those)... Anyhow, optimal bias seemed to be around 110mA, at which level the 1MHz 8Vpp signal was clean on the scope.

Some suitable Darlington pairs for the output stage:
BDW63/BDW64
BDW83/BDW84
2SD2083/2SB1383
TIP142/TIP147
MJH11022/MJH11021
...and so on...

If you use the MosFET pair 2SK1530/2SJ201,
change RGN to 365ohm and RGP to 220ohm.

IRFP240/9240 is a no-can-do. LME49811 can barely deliver 5V of bias voltage, which is not enough for the IRFs.

Oh... And the chips GND pin? Yes, its the return for the ShutDown, so all ripple, noise and interference you feed to the SD pin, comes out from the GND. So keep that clean from the audio grounds if you decide to make your own PCB.

Also, if you happen to wonder, how much current does the chip draw during ShutDown? It pretty much shuts down itself also (not only the bias voltage and output signal) and draws therefore MICRO amperes only.

Click the image to open in full size.
Some high quality gold plated double sided PCBs available for this project. PCB size 61mm x 84mm.
I can sell for 20€ / 26$ a piece.
PM if interested...

Thanks again, and good luck!

Last edited by palstanturhin; 24th July 2014 at 07:16 AM.
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Old 17th June 2011, 02:36 PM   #2
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I think you can go without the Vbe multiplier circuit in the bias stage with 2SK1529/2SJ200 mosfet.
But you must use large bias current about 300mA.
Also large THD distortion rises because 2SK1529/2SJ200 have large thermal variation.
So distortion level increased.
You can see national semiconductor application note AN-1645 fig. 20.
Where graph with Vbe multiplier shows bias stability , which is not so good.
So you can see itself. 2SK1529/2SJ200 have large thermal variation.
My suggestion is , you must use renesas mosfet 2SK1058/2SJ162 for your application with resistor bias stage.

2SK1529/2SJ200 and 2SK1530/2SJ201 caracterstics are almost same. 2SK1530/2SJ201 have high voltage and currunt rating.
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Old 17th June 2011, 03:52 PM   #3
AndrewT is offline AndrewT  Scotland
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the 49811 will almost certainly not have sufficient + to - drive voltage to be compatible with either LatFETS nor to normal VertFETs.
It may work with with the low Vgs High gfs 1529/200.

The 49830 is designed to specifically have sufficient drive voltage for FET outputs.
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Old 20th June 2011, 02:43 PM   #4
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Thanks for the input!

I have decided to use thermal tracking in the bias stage after all...
Is it OK to use almost what ever BJT transistor in the VBE multiplier circuit?
For example TIP31?

Thanks again for your help!
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Old 20th June 2011, 05:10 PM   #5
AndrewT is offline AndrewT  Scotland
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bc54xb and thousands of other small signal transistors.
Or use a sot23 NPN glued to the collector leg of one power device where it exits the package. For better tracking of both output devices use an NPN & a PNP glued to both output device collectors. Then use the dual transistor version of the Vbe multiplier.
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Old 24th June 2011, 11:26 AM   #6
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Thanks Andrew for your suggestions!

It would probably be better your way, but I was thinking to make this very small and compact.
This is what I have in my mind and actually have all the components for it also.
Will it work?
Click the image to open in full size.

Questions:
Does the component values seem OK?
Suggestions for CB? Value, type?
I have TIP31 for QVBE, OK?
Will I get a problem, if I used Rs as the volume control at the same time?

Thanks again for all input...
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Old 24th June 2011, 05:27 PM   #7
AndrewT is offline AndrewT  Scotland
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Is Cb the cap across the Vbe multiplier?

Cn seems too low. It creates an ~7MHz low pass filter.

Is Rb3 (390r) in the correct place?

The gate stoppers should be fixed value resistors soldered directly to the gate pins.
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Old 25th June 2011, 01:30 PM   #8
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Quote:
Originally Posted by AndrewT View Post
Is Cb the cap across the Vbe multiplier?

Cn seems too low. It creates an ~7MHz low pass filter.

Is Rb3 (390r) in the correct place?

The gate stoppers should be fixed value resistors soldered directly to the gate pins.
Yes, CB is the Vbe multiplier capacitor.

Cn - noted...

RB3 is needed according to the LM data sheet AN-1645, but I don't know how much I can copy from there directly for this chip???

Gate resistors - noted.
Can I use the values from AN-1645 (500r for P-channel and 175r for N-channel)?
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Old 27th July 2011, 04:01 PM   #9
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Hello again!

Circuit updated!
NOT WORKING!
I believe it oscillates like crazy, or at least it consumes all power available from the PSU.

No DC voltage at the output.

One channel consumes 95W of power with 10k resistor (RS) at the input. With input short circuited power consumption rises to 110W (55W per rail = PSU max.) - how interesting?

Is my circuit OK? Or do I have a problem with my PCB?
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Old 27th July 2011, 06:09 PM   #10
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I measured the voltages at the source and the sink pins.
Voltage at the source is +2.55V,
and at the sink -2.38V.

OK???
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