The simplistic Salas low voltage shunt regulator

[Salas]

Hi all,
I'm building a spice model of the Reflektor D to help me understand the way it works while I'm waiting for the board of the group buy to arrive.
It's almost there but I can't find a model for the MTP3055VL. Does somebody have its spice mdoel or maybe a suggestion for a part that can reasonably well replace it in the model?
Thanks

*MTP3055VL MCE 6/9/97
*Ref: Motorola TMOS Databook Q2/96
*60V 12A .12ohm Power MOSFET pkg:TO-220 2,1,3
.SUBCKT MTP3055VL 10 20 30
* TERMINALS: D G S
M1 1 2 3 3 DMOS L=1U W=1U
RD 10 1 56M
RS 40 3 4M
RG 20 2 40.6
CGS 2 3 389P
EGD 12 0 2 1 1
VFB 14 0 0
FFB 2 1 VFB 1
CGD 13 14 270P
R1 13 0 1
D1 12 13 DLIM
DDG 15 14 DCGD
R2 12 15 1
D2 15 0 DLIM
DSD 3 10 DSUB
LS 30 40 7.5N
.MODEL DMOS NMOS (LEVEL=3 VMAX=125K THETA=80M ETA=2M VTO=1.6 KP=18)
.MODEL DCGD D (CJO=270P VJ=0.6 M=0.68)
.MODEL DSUB D (IS=49.8N N=1.5 RS=31.7M BV=60 CJO=400P VJ=0.8 M=0.42 TT=55.7N)
.MODEL DLIM D (IS=100U)
.ENDS

 

[gior]

Thank you Salas

 

[50AE]

Hello,

I managed to find 2sk184 JFETS at my local electronic shop. Their datasheet are exactly the same as the 2sk117, only that the sk184 are in a smaller package.

But there were only Y grades. Anyway, I bought them (15 only). I will build 2 pairs of BLB1.1 with them for my PCM56 future project.

 

[Salas]

Its better they are Y because only 200mW so not to become hot in positions with enough voltage across them. Maybe you will not need R108 R208 but just jumpers not to decrease the Q102 Q202 Y range Idss further.

 

[50AE]

Yes, I can omit R108 completely.
I can also mix 2SK117 with 2SK184, because I have some 117s left.

For Q102 and Q103, I can place the 184s and for Q105 I can place 117s. What do you think?

 

[Salas]

I would put the K184s in places where they will not see more than 70mW dissipation considering their VDS for their individual IDSS in a particular Vin and Vout regulator.

 

[shattered_dream]

Hmmm is it possible to do +5V supply with the bjt kit? Need that for my raspberry

Gesendet von meinem HUAWEI P6 S-U06 mit Tapatalk

 

[Salas]

Yes. The base stopper resistor needs be an order of magnitude lower than when using a MOSFET though. Its all in the BIB guide for the BJT option as long as its output impedance plot. Many had made it in BJT output configuration in the past.

 

[stajo]

Salas, guys, the "minimum load of 100 mA" for the SSLV, is that the load itself or is that with the CCS settings?

 

[Salas]

Its the CCS setting even when the load itself is few mA only. So to have the reg run on some basically good spec.

 

[stajo]

Thank you very much sir Salas

 

[mlackey]

New to the party

I'm new to the party: where can I find info on the last (next) group buy, if it exists?

 

[AIM65]

Hi,

as the whole thread is a bit long to read (740 pages...), in addition of the next GB, in which post can I find the current version under discussion of the regulator schematics and BOM ?

Thanks !

 

[Salas]

Whenever there is a new GB announced its done in the GBs forum section. Post#2 here has links to the several types that are being discussed in this thread.

 

[mlackey]

Thank you

Thank you.

 

[leapcat]

🙄

 

[stajo]

Evening. The toshibas, QX02, QX03 and QX05 shall go in rising order. I have all values from 3,5 to 5,7. What spread should I ideally choose? 0,1 mA inbetween or lesser/more? Any max/min?

 

[Salas]

3.5-4-4.5 order with up to 10% in-between matching. Not crucial, but nice if you have many.

 

[2 picoDumbs]

Before I make some dumb comments is the circuit still based on post 1

 

[AndrewT]

Post1 sch still works.

For best performance the LOCATIONS of components needs to be considered.
See what you can find about monitoring the output voltage and how the lead outs of the monitoring circuit should be brought to the OUTPUT terminals of the regulator.
S0, S1, F0, F1 is typically used to differentiate between Force and Sense.