So I am trying to understand something about one of my Boost/Buck converters.
Sorry for the long write up. I can't always seem to get out of my brain what I want to make it easier for others so bare with me please.
One I am working with a Boost/Buck that I will call B/B for ease. At the Input it is being powered with 19.5v and Max input of 4.24amps.
I am Boosting the B/B upto only 20v and have set a Current limit of 2.60amps.. This is going to a Buck converter that is setup at 12.9v and have it set to current limit to 2.40 amps.
My question and looking to understand why the Output in current from B/B is lower then the output to the Device to the load.
While I didn't look at the inrush of the B/B I did have an inrush at the Buck of 2.30amps before it settled down to 1.30amps. This was confirmed with my DVOM also connected inline with the load. Once I was to the current of 1.30amps on my DVOM between the load and the buck I looked at the current on the B/B and it was only 0.943. I didn't understand how that could be so I then connected my DVOM between the B/B and the Buck ran the test again and it did show 0.945 once the inrush went to normal current showing on the buck of 1.28amps.
Everywhere you read that the Supply of the unit needs to be a higher rated current then the buck or boost by a large degree. and for what ever reason this isn't the case in this and was wondering if there was some way I could read somewhere why this B/B is lower in current then the buck while at 20v output. It does change if I change the output voltage from 20v to 30v on B/B
Thank you in advance
James
Sorry for the long write up. I can't always seem to get out of my brain what I want to make it easier for others so bare with me please.
One I am working with a Boost/Buck that I will call B/B for ease. At the Input it is being powered with 19.5v and Max input of 4.24amps.
I am Boosting the B/B upto only 20v and have set a Current limit of 2.60amps.. This is going to a Buck converter that is setup at 12.9v and have it set to current limit to 2.40 amps.
My question and looking to understand why the Output in current from B/B is lower then the output to the Device to the load.
While I didn't look at the inrush of the B/B I did have an inrush at the Buck of 2.30amps before it settled down to 1.30amps. This was confirmed with my DVOM also connected inline with the load. Once I was to the current of 1.30amps on my DVOM between the load and the buck I looked at the current on the B/B and it was only 0.943. I didn't understand how that could be so I then connected my DVOM between the B/B and the Buck ran the test again and it did show 0.945 once the inrush went to normal current showing on the buck of 1.28amps.
Everywhere you read that the Supply of the unit needs to be a higher rated current then the buck or boost by a large degree. and for what ever reason this isn't the case in this and was wondering if there was some way I could read somewhere why this B/B is lower in current then the buck while at 20v output. It does change if I change the output voltage from 20v to 30v on B/B
Thank you in advance
James