I'm reviewing a single component DC converter for the TI SWIFT Power Module EVM RoadTest.
This article is a review of the efficiency of switching device.
Efficiency According to Specs and Fellow RoadTesters
The datasheet of the says shows the efficiency graph.
As in the image below, I've also measured with VG open.
Feeding a stable 5V to VG improves the efficiency with a few (2 - 4) %.
The datasheet and Frank's measurements show the switcher operating in the middle of it's input range, at 12 V*.
I've measured at the lower and upper range, 8 V and 14 V.
I've increased the current draw for 4 combinations, from 0 A to 7.75 A.
- top left: 8 V in, 0.6 V out
- top right 14 V in, 0.6 V out
- bottom left: 8 V in, 1.2 V out
- bottom right: 14 V in, 1.2 V out.
spreadsheet attached to this blog
Ignore the first few low range measurements. Too close to 0 to calculate a reliable efficiency.
The yellow coloured measurements are done with a non-calibrated current meter. Don't pin me down on those.
This is because the internal resistance of my DMMs limits what I can draw from the EVM at 0.6 and 1.2 V.
* Frank also tested at 9 V, see the referenced image and his review.
|TI SWIFT Power Module EVM RoadTest: Module Review and Test Setup|
|TI SWIFT Power Module EVM RoadTest: Noise Measurements|
|TI SWIFT Power Module EVM RoadTest: Efficiency|