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PCB for cascoded IXYS CCS (tube)

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#162
So ... total number of confirmed boards is 213. Audiofanatic confirmed 20 (payment still pending). I'll order 240 boards so a few extra will be available. Most probably I will have them shipped to USA (no VAT) and every board will be cheaper than 3.7$ we are using as preliminary price. We will know that tomorrow.

Attached you'll find the last revision of the board, let me know if you have comments or suggestions
 

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#164
Gluca said:
So ... total number of confirmed boards is 213. Audiofanatic confirmed 20 (payment still pending). I'll order 240 boards so a few extra will be available. Most probably I will have them shipped to USA (no VAT) and every board will be cheaper than 3.7$ we are using as preliminary price. We will know that tomorrow.

Attached you'll find the last revision of the board, let me know if you have comments or suggestions
Click to expand...

for my is good, if you could make the biggest tracks is better
 
#165
Ordered. They will check the design and confirm the quotation tomorrow. Price so far is 704.2$ for the boards and 86$ for the shipping. That makes a crude price per board of 3.30$. There should be enough headroom to cover mailing costs too with the preliminary price of 3.7$ we were considering. I ordered 240 boards (vs the 233 confirmed) so sigfire can jump on in case he decides so or I (or anyone else) will buy the extra boards.

Boards will be 1.5mm thick, 2oz copper, ENIG finish (gold plated), white silkscreen on black mask.

Tracks are 16mils which is 20x the minimum required for 200mA currents and 10degC temp increase. Increasing the width would require a larger board. IXTP can be operated at 100mA maximum! DN2540 can go up to 500mA in TO220 (8x headroom in this case).
 

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#170
Gluca said:
Hi Radek ... we'll see. I ordere only a very few extra.
Click to expand...

OK, thanks Gluca and remember about me.

Am I correct, that up to 400V B+ there is no problem with substitute DN2540-N5 instead 1000V IXYS IXTP 01N100D without any elements change?

Is LND150 substitutable in this circuit with DN2540-N5 too (despite their differences)?
(I have many DN2540-N5, so for me they are "natural" ;-) )
 
#173
If you use DN2540N5 at Q100 and Q200 (see my schematics) the board will take 400V max. Keep in mind that your B+ must be higher than the plate voltage (if you are using the CCS as plate load): plate voltage (example 150V) + peak signal voltage swing (ex. 50V) + headroom (ex. 20V) ... so you end up with a B+ of 220V minimum to load a 150V tube.

If you are using IXTP01N100D at Q100 and Q200 you can go up to 1000V as the upper FETs (Q100 and Q200) are taking all the voltage drop.

Lower FETs will only see a little Drain-Source voltage drop so DN2540 are fine there.

Clearly you need to stay safe so dissipation and max voltage (I'd derate DN2540 and IXTP by 20% as a minimum) must be kept under control.
 
#175
To make the board work as VCCS you need to replace the jumper JP3 and JP1 with a 0.1u high voltage cap. Q102 (and Q202) needs to be installed too and it works as a CCS and sets the voltage at the gate of Q101 (and Q201) hence the voltage at its drain is fixed.
 
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