Use mosfet, do you have afraid for only 8mA: use big heatsink to dissipate the rest of current not used by the load.
Regal BiB max. Vout 45V Current 100mA-1.5A with IRF9610
Go Salas BiB thread to download the pdf http://www.diyaudio.com/forums/power-supplies/192625-sslv1-1-builds-fairytales.html
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If I remember corectly the output cap is 47uF, why do you want to increase the value?
It's a good idea power AVCC of ESS9018 directly with Salas shunt regulators.
That's integral to the open loop calculations of each. Just use what is listed in each schematic.
Listen to others with experience in combining with such DACs me I don't use them to tell you my subjective comments.
I did some changes to the calculator excel.
It now can calculate the dummy load resistance and its watt rating based on the expected consumption, and then the total mA consumption based on the voltage across the CCS resistor
It now can calculate the dummy load resistance and its watt rating based on the expected consumption, and then the total mA consumption based on the voltage across the CCS resistor
Hi Salas,
From the HV 1.2R schema, how can I increase the input voltage from 45v to 60v?
And, what is the requirement for Q5? I only know if I want LV output, I need to pick a low threshold version. How about capacitance and rise/fall time? Thanks.
From the HV 1.2R schema, how can I increase the input voltage from 45v to 60v?
And, what is the requirement for Q5? I only know if I want LV output, I need to pick a low threshold version. How about capacitance and rise/fall time? Thanks.
...and what about BC547B instead of BC546B (Vceo 45 vs. 65 and Vcbo 50 vs 80) for Q7 when Vout 35V?
R5 & R6 break the output voltage referenced across Q3 & Q4 in two. I don't see what is may hinder you for feeding 60Vin beyond the extra heat created across Q1 the larger the Vin to Vout DC difference becomes. The higher the DC across Q1, its parasitic capacitance tames lower. Just know to have Vout/(R5+R6)~3 to 5mA for the LED with resistors that handle the dissipation (Vo/2)*IR5,6 and adequate Q1 sinking with calculated Q1 temp to be still safe. Q5 should sustain the Vout and have capacitance specs similar to what used in the regular schematic. Dropping with RC,RC if the Vi-VoDC is very large is to be also considered.
Sorry, I should have mentioned earlier. I am going to build a 1.2R regulator for my amplifier VAS stage. My Vin is about 60V, but Vout is around 50V@20ma max. There is only 8V~10V in difference. So, I guess the original schema is fine?
Q7 will have problems with its dissipation sooner or later at 50V Vo. Better use some TO-126 there with highest beta and lowest Cob you can get.
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