Is it possible to run the SSHV2 at lowish voltage and highish current. Such as 100v and 200mA output?
Near lower depletion Mosfet CCS part's IDSS. It varies per unit. Maybe 100mA plus. To surely go 100V you would need 27K resistors instead of 68K in SSHV2. SSHV1 has much more capability in CCS current by using a single enhancement mode part.
i think SSHV V1 can run 200mA at 100V
V in = 120VDC
So you can set R current all = 230 to 250mA . ( R1 ~ 7-10R )
And you need 200mA, can try to make it!
thanks
If you mean how many volts it drops across the cascode, then its about 7 plus whatever mA you set times (R4+R5).
With DCin 176VDC & 32,5mA for two #26 tube preamp, tx is 125VDC 100VA , I ask because I haven't enough space to fit a big heatsink for SSHV2, wich will be the minimum heatsink required if I use all SSHV2,because my box is only 40mm high?
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The sinked CCS Mosfet will burn about 1.5W in that case (with ~30mA setting). So a small one like we use for not too hot LM317 situations will do the job.
I read VR150 datasheet and said the minimum voltage operation is 180-185V, do you think will operate with 176,25VDC?
Not sure, I have checked some of those only above 200V in the past. Better ask the #26 guys.
But the output Mosfet will burn 3.5W so its sink better be 3x the size of the CCS one.
This one 3.7K/W also?
Compre Disipadores Disipador de calor,50x100x28mm KL/B/100 AAVID THERMALLOY KL/B/100 en RS Online y lo recibir en 24/48 horas.
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Compre Disipadores Disipador de calor,50x100x28mm KL/B/100 AAVID THERMALLOY KL/B/100 en RS Online y lo recibir en 24/48 horas.
N.B. I have this one on hand.