GLOSSARY

Direct or alternating current flowing between the input and output or housing of a galvanically isolated power supply at a defined voltage.

Percentage deviation of the output parameters from their nominal value, taking into account all minimum or maximum permissible operating conditions.

In switching power supplies, derating is the specified reduction of an operating parameter to increase reliability. This is usually a reduction in power at elevated ambient temperatures.

Change in parameters within a specific period of time, measured in a steady state under constant nominal conditions.

Circuit topology for switching power supplies. Energy flows from the primary to the secondary side during the conduction phase of the switching transistor and the secondary diode. The energy required to maintain the output voltage during the blocking phase is temporarily stored in the output choke.

Behaviour of the control system during rapid load changes; parameters are settling time and deviation of the output voltage, including tolerances.

Filter at the power supply input to suppress mains interference and comply with normative EMC requirements. This filter can also be connected externally.

The input voltage range is defined by the upper and lower tolerance limits of the input voltage of an AC/DC power supply or DC/DC converter.

Circuit or measure for limiting the inrush current.

Short-term peak current flowing at the input of a device from the moment it is switched on until it reaches operating status.

Power supply circuit that uses a transistor as a switch. During the forward phase of the semiconductor switch, energy is stored in the transformer, which is then released to the secondary side during the reverse phase.

Input current of a power supply unit when idle or switched off by remote control.

Ratio of power absorbed to power delivered, expressed as a percentage; generally specified at rated input voltage and full load.