Hi,
I'm trying to get this tiny XL6009 board working with 35 Volt DC output and a default load of 35 mA with 9.5 Volt DC input from a wall wart.
When I power the the wall wart I get 35 Volt DC. I can change the voltage if I want, so the XL6009 board is working. When I connect a 35 mA load I still get 35 mA. Still good!
But when I power the wall wart with the load already connected I get an oscillating output voltage my DMM cannot follow, from 4 to 15 Volt (very unstable).
The wall wart gives 9.5 Volt DC all the time, so the input voltage is stable.
Is there anything I can do to get the XL6009 board running with a load already connected?
Regards, Gerrit
I'm trying to get this tiny XL6009 board working with 35 Volt DC output and a default load of 35 mA with 9.5 Volt DC input from a wall wart.
When I power the the wall wart I get 35 Volt DC. I can change the voltage if I want, so the XL6009 board is working. When I connect a 35 mA load I still get 35 mA. Still good!
But when I power the wall wart with the load already connected I get an oscillating output voltage my DMM cannot follow, from 4 to 15 Volt (very unstable).
The wall wart gives 9.5 Volt DC all the time, so the input voltage is stable.
Is there anything I can do to get the XL6009 board running with a load already connected?
Regards, Gerrit
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At startup it is common for switching boost converters to have current swings that are much larger than at nominal load. It is possible that your wall wart is not up to it. Try a larger wall wart or bench PSU.
Hi Bohrok2610,
I guess this could be the reason. I will definitely try with another wall wart.
As I had several XL6009 boards lying around I took a "fresh" one. Same issue as the other two I tried.
I solved this by adding a 6.8 Ohm resistor in series with the + lead of the wall wart to the XL6009 board and a 22000 uF capacitor after the series resistor (palallel with the board's input).
This was done with my trial and error method, and the result is now a 100% output stable voltage and the XL6009 board is starting with my default load (only 25mA).
Regards, Gerrit
I guess this could be the reason. I will definitely try with another wall wart.
As I had several XL6009 boards lying around I took a "fresh" one. Same issue as the other two I tried.
I solved this by adding a 6.8 Ohm resistor in series with the + lead of the wall wart to the XL6009 board and a 22000 uF capacitor after the series resistor (palallel with the board's input).
This was done with my trial and error method, and the result is now a 100% output stable voltage and the XL6009 board is starting with my default load (only 25mA).
Regards, Gerrit