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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 24th February 2019, 09:40 AM   #1231
dewdrop is offline dewdrop  Singapore
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Salas SSLV1.3 UltraBiB shunt regulator
Looks very good!
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Old 24th February 2019, 09:54 AM   #1232
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Looking like it means business. Its also good that he used thick enough cabling between the PSUs and the Soekris input power connector. Something that not all remember to do all the time.
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Old 24th February 2019, 10:24 AM   #1233
RainfallSky is offline RainfallSky  Russian Federation
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What would be the best M1 and M2 transistors for DCG3?
I guess DCG3 is always below 1A.


Some random comparisons:

M1 Positive:
FQP3P20 (Ciss 190 pF, -2.8 A)
IRF9610 (Ciss 170 pF, -1.0 A)

M2 Positive:
IRF530 (Ciss 670 pF, 10 A, Gfs 5.1 S)
IRF620 (Ciss 260 pF, 3.3 A, Gfs 1.5 S)
IRF610 (Ciss 140 pF, 2.1 A, Gfs 0.8 S)

---

M1 Negative:
FQP3N30 (Ciss 175 pF, 3.2 A)
IRF610 (Ciss 140 pF, 2.1 A)

M2 Negative:
IRF9530 (Ciss 860 pF, -8.2 A, Gfs 3.7 S)
IRF9620 (Ciss 350 pF, -2.0 A, Gfs 1.0 S)
IRF9610 (Ciss 170 pF, -1.0 A, Gfs 0.9 S)

Last edited by RainfallSky; 24th February 2019 at 10:28 AM.
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Old 24th February 2019, 10:45 AM   #1234
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
M1 can alternatively be IRF9610/IRF610 (pos/neg) when below 1A setting. It also consumes less gate to source voltage. So good enough for DCG3 UBiB PSU use. The FQP3P20 is good up to 1.77A when well hot, its 2.8A headline spec is at an optimal 25C core temperature. That is why I spec the regs at 1.5A max before considering slower but more powerful M1 types like the IRF9630/IRF630. So to stay on the conservative side.

M2 is always IRF530/IRF9530 (pos/neg) due to correct open loop gain phase margin considerations. IRF630/IRF9630 could be their only secure alternative for maintaining correct stability margins in these circuits. Theoretically so because I haven't tested them on an actual UBiB PCB as M2.
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Old 24th February 2019, 10:55 AM   #1235
RainfallSky is offline RainfallSky  Russian Federation
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Got it. Thank you, Salas!

P.S.: Yes took wrong Ampere numbers from FQP3P20, FQP3N30.

Last edited by RainfallSky; 24th February 2019 at 10:58 AM.
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Old 24th February 2019, 11:00 AM   #1236
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
See you at the DCG3 thread then with a pre-amp build made in Peter to show
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Old 24th February 2019, 11:22 AM   #1237
RainfallSky is offline RainfallSky  Russian Federation
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Quote:
Originally Posted by Salas View Post
See you at the DCG3 thread then with a pre-amp build made in Peter to show
I will.
You know. This is how we call our city in short.



One last question.
Is it a bad thing to mix IRF5** and IRF6** series?

M2 Positive Board:
IRF530 (Ciss 670 pF, 10 A, Gfs 5.1 S)
IRF630 (Ciss 800 pF, 5.7 A, Gfs 3.8 S)

M2 Negative Board:
IRF9530 (Ciss 860 pF, -8.2 A, Gfs 3.7 S)
IRF9630 (Ciss 700 pF, -4.0 A, Gfs 2.8 S)

IRF530 seems like a beter at Ciss and IRF9630 seems beter overall (for DCG3).
So can M2 Pos IRF530, M2 Neg IRF9630 be used?
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Old 24th February 2019, 11:57 AM   #1238
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Its not bad to mix when the pF are close. The gfs S (Siemens) are closer at low current on the curves too.
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Old 24th February 2019, 12:01 PM   #1239
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
P.S. For correct current setting of dual UBiBs as coming from the DCG3 thread, remember:

"Rule of thumb for knowing you always got 100mA reserve, massaging the particular shunt regs to good effect in all DCG3 uses, is: Negative rail R1 setting = DCG3 bias level +100mA. Positive rail R1 setting = 2xDCG3 bias level + 100mA. Sinks size must be adequate. The UBiB's MOSFETS are tough but for robust reliability better not have more than 60C on their sinks in the long run. With so much high idling circuitry in a box, good ventilation is a must too."
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Old 24th February 2019, 12:21 PM   #1240
nashbap is online now nashbap  United States
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Quote:
Originally Posted by Salas View Post
Looking like it means business. Its also good that he used thick enough cabling between the PSUs and the Soekris input power connector. Something that not all remember to do all the time.

Salas what do you suggest is thick enough AWG?
Thanks. nash
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