Hi everyone,
I'm reading about AC-DC and DC-DC converters and there's something I cannot quite grasp. A lot of AC-DC bricks output to 19V, and a lot of DC-DC units and motherboards take 19v as input. But then they regulate that down to 12v, 5v and 3.3v.
Is there a reasoning behind this 19v step between the 2 units? There are also AC-DC units that output 12v, which seems more efficient to me, as you don't have to regulate it again in the DC-DC unit. But I have no technical knowledge whats however about this. Anyone who straighten this out for me? Thanks!
I'm reading about AC-DC and DC-DC converters and there's something I cannot quite grasp. A lot of AC-DC bricks output to 19V, and a lot of DC-DC units and motherboards take 19v as input. But then they regulate that down to 12v, 5v and 3.3v.
Is there a reasoning behind this 19v step between the 2 units? There are also AC-DC units that output 12v, which seems more efficient to me, as you don't have to regulate it again in the DC-DC unit. But I have no technical knowledge whats however about this. Anyone who straighten this out for me? Thanks!