Salas SSLV1.3 UltraBiB shunt regulator

[asphalt]

It’s current draw is not more than 2 amps
I will start going through the board after dinner
Thank you for your input so far
Mark

 

[merlin el mago]

Also remember reg. needs 100mA on top of load power consumption to work properly.

 

[merlin el mago]

Measure the voltage at C1 to see if you have between 12-13VDC

 

[merlin el mago]

Something is happening that DC doesn't arrives to R1

 

[asphalt]

There is 12.65VDC across C1

 

[merlin el mago]

That's ok

 

[merlin el mago]

Could you test the VGS for M1, Q1 & J1?

 

[merlin el mago]

J3 have more of 7.5 mA Idss for 5 Vout?

 

[asphalt]

I got a measured J3 Idss from Teabag of 4.4mA

 

[merlin el mago]

That's the guilty

 

[asphalt]

I’m confused the Idss for J3 needed to be < 7.5 mA for 5V outputs per the instructions

 

[merlin el mago]

Yes

 

[asphalt]

So isn’t 4.4 ok?

 

[merlin el mago]

I'm sorry, not for 5 Vout.

 

[merlin el mago]

If you have more PF5102 could you measure the Idds and use one of more of 7.5 mA

 

[asphalt]

Yes I can do this

 

[merlin el mago]

Let us know how it goes?

 

[asphalt]

No change still ~12.5 V DC at output with a 7.4 Idss

 

[merlin el mago]

Guide says <7.5 mA

Still 0V across R1?

 

[asphalt]

Yes
I pm’d Salas to review our thread so far. I really think it’s a design issue. I think I will try changing R1 to a much higher value tomorrow. I’m giving up tonight.
Again thank you for all your help
Mark