Circuit assembly for connecting to a current source

A field device of automation technology, comprising:

• a terminal pair for connecting the field device to a 4-20 mA current loop;
• a radio module for wireless communication with the field device;
• and
• a circuit assembly, including:
• a boost converter including a coil, a flyback diode connected in series with the coil, an output-side storage capacitor for summing an output voltage, and a switching element for connecting the coil to ground;
• and
• a circuit part for dynamically controlling the switching element of the boost converter, wherein the circuit part is designed to control the switching element of the boost converter in a start-up phase such that the current loop directly charges the storage capacitor via the coil until a predefinable or adjustable switching threshold is reached,
• wherein the circuit assembly is connected on the input side to the terminal pair and on the output side to the radio module.