2018-08-07, 04:13 PM
See a comparison of two different 12V to 5V converters. One uses a TPS 40057 and the other one a LM2596S switching regulator.
https://www.rooco.eu/2018/08/07/improve-...wer-supply
The results with the TPS regulator are really bad. You should not conclude from this, that you should avoid TPS based converters. The problem might not be caused solely by the switching regulator chip, but also by the converter design itself (capacitor values, capacitor types, inductor quality, PCB design etc.)
In general, do not use the cheapest converter you can get. Rule of thumb: The cheaper the converter, the higher the noise. Low-cost designs do not really care about noise, ringing, oscillation, etc. These converters might work satisfactorily to load your smartphone battery but are not recommended to power RF device, like the Moitessier HAT.
https://www.rooco.eu/2018/08/07/improve-...wer-supply
The results with the TPS regulator are really bad. You should not conclude from this, that you should avoid TPS based converters. The problem might not be caused solely by the switching regulator chip, but also by the converter design itself (capacitor values, capacitor types, inductor quality, PCB design etc.)
In general, do not use the cheapest converter you can get. Rule of thumb: The cheaper the converter, the higher the noise. Low-cost designs do not really care about noise, ringing, oscillation, etc. These converters might work satisfactorily to load your smartphone battery but are not recommended to power RF device, like the Moitessier HAT.