How to use PPK2 with voltage over 5V

[BobC]

I would like to use a PPK2 on a custom board I have developed.  This board requires an power supply voltage of at least 7.5V, up to 9V.

In looking over the wiring diagram for the PPK2, I see that the supplied power is run through the PPK2.  Since the PPK2 is specified for a maximum supply voltage of 5V, it seems that I cannot use it for the particular DUT at hand.

I've given this some thought, and it occurs to me that I might be able to power the DUT using a 5V-to-8V buck converter, thereby remaining within the limits of the PPK2 while still satisfying the DUT power needs.  I realize that there would be power loss due to the converter, but I might be able to account for that.  However, it also seems to me that the inductance of a buck converter would distort the current usage pattern, preventing the PPK2 from showing the actual peaks, lows, and duration of power usage by the DUT.

Does anyone have a means of obtaining accurate readings with a PPK2 where the DUT requires more than 5V?

[ketiljo]

Maximum voltage for the PPK2 is 5 V. If you need higher voltage, maybe tap into the circuit after the regulator? You can add loss in the regulator after. 

[ustire@Nordic]

Hi I just posted a similar question on Dev zone.. I am trying to use the PPk2 to measure current draw from a 9V battery which is used for powering my DUT. I am able to use the PPK2 in source mode however I need to consider the discharge characteristic of the battery hence my need to use it on the DUT with PPK 2 in ampere mode. You suggest a buck converter and then accounting for the loss . How would you add the loss and how would you determine it. Thanks

[Kenneth]

This is a 3year old case, please continue thread here:
PPK 2 for greater than 5V source and tests scenarios when used as source 

Kenneth