"Yes! I would try that, the thing is that if I put those values, Ill get 350V
1,2mA as the datasheet says.
That´s why I made this calculations :
If I want to get a Vout of 180V for supply a Nixie tube, I need to put a R1
=47K and R2 = 300. that`s Why I putted those!
"
You need to look at the current in the FB loop. The datasheet values give a
feedback current around 35uA, so for 170v and FB i of 35uA, you're looking at
something around 5M for R1
CheersIan
On Wednesday, 24 June 2020, 14:13:15 BST, Paul Andrews <[email protected]>
wrote:
Also, if the datasheet shows transformer pin 6 connected to ground and pin 4
connected to the output. You have these swapped.
On Wednesday, June 24, 2020 at 9:08:46 AM UTC-4, Paul Andrews wrote:
Where is D4 in your circuit? It should be between the transformer pin connected
to SW and the transformer pin connected to ground.
On Wednesday, June 24, 2020 at 9:06:07 AM UTC-4, MrThe50sanchez wrote:
Hello !
Yes, I used the components that the Datasheet says, I got it from here:
The thing is, that a Triple Voltage Circuit uses electrolitic capacitors, this
is not the same configuration as a voltage triple circuit, but, Can It be that
the capacitors I added are not electrolitic? I just
putted normal ones (SMD 10nF 250V).
Thanks a Lot!
El miércoles, 24 de junio de 2020, 14:49:49 (UTC+2), Paul Andrews escribió:
Read the layout recommendations in the LT1308A datasheet. You will need to
adapt it to this configuration.
What is the voltage rating of the 47k resistor? What are the voltage ratings of
the 10nF capacitors? What is the voltage rating of BAV21W? What is the
saturation current of the transformer?
On Wednesday, June 24, 2020 at 6:46:01 AM UTC-4, MrThe50sanchez wrote:
Hello! Thanks for the response!
I add here again the PCB layers that Im using.
El martes, 23 de junio de 2020, 23:40:06 (UTC+2), Kevin A. escribió:
What does your layout look like? Show us a picture of the pcb with the layers
visible.
Just the layout of the board can make or break a DC-DC converter with all of
the high current transients and control signals.
On Tue, Jun 23, 2020, 4:22 PM MrThe50sanchez <[email protected]> wrote:
Hello Again, hope everyone is good!
I was trying to make a DC-DC booster converter using the LT1308B/A device, I
made a PCB for it, doing the same as the datasheet of this device says, but I
don´t get the High Votage, and that`s
why im here asking for help, I tried a lot of things put don`t know what it can
be.
This is the schematic I use (This one is from the datasheet) :
The PCB I made is the same as this schematic and using the same components, Im
using a rechargable battery CR2 800mAh 3.0V Li-on.
Any Ideas of what I can do to find what is going wrong?
*I have LBI and LB0 from the LT1308 Device not connected to anything.*/SHDN pin
is connected to Vin, Positive Voltage to It works.
*Because I want 180V output voltage I have resistor from FB R1 = 47K and R2 =
300 Ohm to get 1,21V Feedback.
*The capacitors Im using (10nF 250v) are not electrolitic, they are normal
ones.
Thankss Guys!
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