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 31 
 on: January 12, 2019, 06:20:22 18:20 
Started by gfull - Last post by pickit2
CountryCanada
NoteMy profession; Hardware Engineer and hobby includes , Micro-controllers and FPGA, DSP, LED for grow lights, High power lasers. Enjoy discussing and sharing on any topic of interest.
you forgot the part about getting membership to a forum while on a Mute: nice try.

 32 
 on: January 12, 2019, 01:50:42 13:50 
Started by Manuel - Last post by Manuel
Mains to 12Vdc,
then connected to an electronic that use V-REG to reduce voltage for processor side to 3.3V.
take care,
Xo!

 33 
 on: January 12, 2019, 01:48:00 13:48 
Started by Manuel - Last post by vern
What are you talking about? Now I understand absolutely nothing. What is it, Mains to 12V, or 12 to 3.3V or what?

 34 
 on: January 12, 2019, 10:18:33 10:18 
Started by Manuel - Last post by Manuel
What a Nice Mess is growing up....

I will explain you all tomorrow, since I am away today.

Voltage regulator was: MCP1703 at 3.3V SOT23-3: in my project just such type of product can be used, since it's small, efficient and really with low noise. A common 78L03 can not be used because too noisy.

5 different switching low cost power supplies from chinese market, all are working correctly, all expose same issue. CUI and MEANWELL does not expose this issue.....

I will give you further detail tomorrow...

take care,
Xo!





 35 
 on: January 12, 2019, 09:17:17 09:17 
Started by Manuel - Last post by zokij
Manuel,
What 12V 2A switching power supplay do you use?
that it might not be a 2V 2A switching power supplay battery charger?
for 2V 2A switching power supplay battery charger its all what you write normal when you connect other then battery...

probably you  should  check is it charger...

 36 
 on: January 12, 2019, 08:12:51 08:12 
Started by Manuel - Last post by Sideshow Bob
It could also be that your test load is to light. You could introduce a bleed resistor to closer mimic your real load. And also we are not sitting next to you on your workbench so we know nothing about your setup. Instead of giving information drip by drip. Put ALL relevant information on the table

 37 
 on: January 12, 2019, 07:06:53 07:06 
Started by Manuel - Last post by optikon
Thank you to you all first of all !
...

Anyhow, there are also other considerations that can be done: does a spike of 2us up to 20.8V will destroy a component that has 18V as absolute maximum rating ?


After repeated applications of power up spikes, I would say YES quite possibly it will damage / destroy in the long run. It is an electrical over-stress for the component.

If  in the end, its a poor converter design -- then change it. No use keeping junk designs around. If on the other hand you HAVE to live with it.. then perhaps you can use higher voltage rated components or add some clamping protection like TVS diodes, series R-C, zener diode etc... or do both.

 38 
 on: January 12, 2019, 05:54:18 05:54 
Started by Manuel - Last post by pickit2
Another point you say the Voltage Regulator gets fried.
What Device? Please don't say a 7805
What extra Protection?
We are looking into a fog of mist.

 39 
 on: January 12, 2019, 05:46:20 05:46 
Started by Manuel - Last post by vern
This has nothing to do with cable length, filtering etc, there is definitely something wrong with the control loop or maybe a missing or broken output cap.
What kind of power supply is it? Off-the-shelf power supply or your own design?
Did you try and put a larger cap (like several 100uF) to the output? That would stabilize the control loop.

To SIGNAL: in your diagram L1 should be more like 3uH with 2m cable and of course there must be a similar one in the - line.


 40 
 on: January 12, 2019, 05:39:12 05:39 
Started by Manuel - Last post by Signal
On picture I previously posted an "Out" is a supposed connection point of oscilloscope probe. At R2 a voltage spike is higher.

In some of my low power devices to be connected to vehicle's 12/24V battery line I use serial Anti-Pulse serial resistor (3.9 Ohm) before 30 - 50 uF capacitance at voltage regulator's input. Of course, in case you need 2A this solution is not suitable and should be modified. For example by adding serial resistor not in serial with input but in serial with input capacitor (or to add RC snubber in parallel to input C).

pickit2 already suggested that you need higher ESR, Manuel. You, instead, change to ceramic capacitor with even lower ESR. Why to ask if then not to listen?

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