Hardware Insights Forum

Excellent review.

I really like your thoroughness.

When you said that the 5VSB was inefficient because it was an inexpensive standby chip, did you mean that this particular chip was inefficient, or that all standby circuits designed with a PWM chip are inefficient?

Cheers

It's because they used an under-rated chip (and increased the no-load voltage in an attempt to compensate). You'd think a high-end unit could afford to do it properly, though.

This one, there is a few corners which have been cut here. Overall with the better clamp meter and more precise low-power measurement, it seems most of the units do not even reach 80 %. But it could still be few percent better than this and that is with lower (closer to nominal) output voltage.