Hello all,
As per subject line, in the case of a CCS based on a depletion-mode FET feeding a shunt regulator.
The FET has a max 150mA rating and my output stage needs 130 mA, plus the current into the shunt. So was thinking about paralleling two CCS cells, i.e. each FET with its own gate stopper and current set resistor, running at say 90mA each. Common drain connections and of course outputs tied together.
Being CCSes there is no risk of one hogging all the current no? The only gotcha I can think of is the two of them starting to oscillate sympathetically, but I'm not knowledgeable enough to judge if it is a risk or not. There surely are other considerations I don't foresee.
For what it's worth both FETs will be put on the same heatsink close together to keep them at about the same temperature.
Thanks in advance for any insights!
Joris
As per subject line, in the case of a CCS based on a depletion-mode FET feeding a shunt regulator.
The FET has a max 150mA rating and my output stage needs 130 mA, plus the current into the shunt. So was thinking about paralleling two CCS cells, i.e. each FET with its own gate stopper and current set resistor, running at say 90mA each. Common drain connections and of course outputs tied together.
Being CCSes there is no risk of one hogging all the current no? The only gotcha I can think of is the two of them starting to oscillate sympathetically, but I'm not knowledgeable enough to judge if it is a risk or not. There surely are other considerations I don't foresee.
For what it's worth both FETs will be put on the same heatsink close together to keep them at about the same temperature.
Thanks in advance for any insights!
Joris
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