xDot inrush current
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Peter Ferland.
Chad GoyetteI am trying to understand the expected inrush current of the xDot while transmitting at full power (worst case). In looking through the developers guide it list inrush charge in mC and a time duration. I am not sure how to work with that specification.
My board is currently using a 50mA regulator to power the xDot (nothing else is connected) and it seems to be dropping out (xDot resets) while trying to connect to my lora network. If i bypass the regulator with a test power supply i have no issues.
Is there a recommended minimum regulator size that should be considered to power the xDot before factoring in other loads?
Peter FerlandThe developer guide reports a worst case inrush charge of 0.132mC over 153us – you can simply divide that to get a mean inrush current of ~0.86A. You will definitely need a larger regulator. The xDot developer board uses a SPX3819 LDO voltage regulator rated at 500mA nominal and transients up to 950mA. You can see the supply circuit on page 49 of the developer guide.