How did you calculate the current through the 10Ohm resistor connected to the TPs? I mean 2.04V across 6.8 Ohm is 300 mA, but serially to this circuit (and so - the current must be the same) you calculated 46.7mA.
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The voltage across the dummy load suggests much more current than what the TP suggests. Use mA meter in series from lab PSU to CCS and verify the current draw.
Is incredible, I connected 100R between the PSU and the CCS with 6R8 load connected and adjusted to 3V across 100 ohm = 30mA across 100R, I measured the voltage across 6R8 and is 0.151V / 6R87 = 21mA, really I don't understand nothing.....or the own CCS consume by itself 9mA?
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Maybe some tolerance on 6R8 absolute value and the 0.151V DMM reading? Use a higher value dummy?
In normal no mod SSHV2 test in that post#1 troubleshooting link I could adjust expected mA range for zero Ohm CCS load. There is picture with lab PSU showing 45mA. If yours (modded) can't adjust low or even draws hundreds of mA with very low dummy or jumper, means it needs some series resistor to break it, that is why it burned?
Tested with 9V bench PSU, jumper as load, voltage across 100R between the PSU and the modded CCS 2.944V, still have I to add some series resistor?
Merlin I really don't know what is the deal with Jung mod at HV. I suggested a suspicion maybe a series resistor could be holding it better but maybe it was you had no Zeners it burned. Your choice.
I don't have 10K for dummy load, could use 4k75 or 15k for HV?
Walt Jung says 10dB at low frecuencies.
Walt Jung says 10dB at low frecuencies.
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15K + 15K in series for 10mA ( @ 300V ) consumption dummy across the output of the whole regulator.
That's the PSRR getting better spec. That we know. How the MOSFETS react to HV power-on transient with the VGS booster including a capacitor to charge we don't know.😉