nRF52832 BLE Beacon sample not working with external buck converter

[X4ce]

Hello,

I am developing a custom board using nRF52832 (QFAA) and flashed (no debug) it with sample beacon app (NCS) to check the transmission. When I power custom board using VDD & Gnd from nRF52840 DK, I can see the beacon packets on the nRF app but when I power it using on-board buck converter (TPS5430), I don't see any beacon packet on the app but it does when I revert power to nRF DK. Using buck converter, I see a voltage of 3.4V across the decoupling caps. Here is my nRF52832 schematic along with buck converter.

I will be grateful, if someone could shed their expert opinion/ suggestion on this issue.

Regards

Shahid

[Simonr]

Hi

Okay, so as long as you have 3V or more over the test point from the buck converter you should be fine here. But please double check that the Buck converter is connected/soldered properly, as it seems very strange. The other thing it could be is that it outputs too little current and that the Ampere is to low, but that seems strange too.

Best regards,

Simon

[X4ce]

Thanks for reply.

I have checked voltage at all the decoupling caps of nRF and also Buck's LED at 3.4V is also working.

This is Buck supports 1A.

I am still unable to figure out what could be the issue.

Regards