Arrangement - with an isolated power supply device , which has: an input (E20) for applying an input voltage (Ue), an output (A20) isolated from the input (E20) for outputting a controlled output voltage (Ua) and a control terminal (S20), to which a control signal (Srk) can be applied for raising or lowering the output voltage (Ua), and - with a voltage evaluation module , which is connected to the output (A20) of the power supply device and supplies a feedback signal (Sr), which is dependent on the voltage level of the output voltage (Ua), to an isolated component (OPTO), - wherein the voltage evaluation module is configured so that the feedback signal (Sr) is additionally dependent on the operating frequency spectrum, which is dependent on the input voltage (Ue), of the power supply device , - wherein the voltage evaluation module comprises at least two differently operating target-actual comparators , which generate different output signals (Sr1, Sr2), and comprises a frequency-dependent control element , - wherein the target-actual comparators generate a comparison signal as a function of the voltage level of the output voltage (Ua), - wherein the frequency-dependent control element influences the mode of operation of the voltage evaluation module as a function of the operating frequency spectrum of the power supply device , wherein - the frequency-dependent control element is configured so that it selects in each instance one of the target-actual comparators to generate the feedback signal (Sr) as a function of the operating frequency spectrum of the power supply device . - with an isolated power supply device , which has: an input (E20) for applying an input voltage (Ue), an output (A20) isolated from the input (E20) for outputting a controlled output voltage (Ua) and a control terminal (S20), to which a control signal (Srk) can be applied for raising or lowering the output voltage (Ua), and - with a voltage evaluation module , which is connected to the output (A20) of the power supply device and supplies a feedback signal (Sr), which is dependent on the voltage level of the output voltage (Ua), to an isolated component (OPTO), - wherein the voltage evaluation module is configured so that the feedback signal (Sr) is additionally dependent on the operating frequency spectrum, which is dependent on the input voltage (Ue), of the power supply device , - wherein the voltage evaluation module comprises at least two differently operating target-actual comparators , which generate different output signals (Sr1, Sr2), and comprises a frequency-dependent control element , - wherein the target-actual comparators generate a comparison signal as a function of the voltage level of the output voltage (Ua), - wherein the frequency-dependent control element influences the mode of operation of the voltage evaluation module as a function of the operating frequency spectrum of the power supply device , wherein - the frequency-dependent control element is configured so that it selects in each instance one of the target-actual comparators to generate the feedback signal (Sr) as a function of the operating frequency spectrum of the power supply device . <EOS>