A new improvement in preregulation makes this linear power supply as small and efficient as a high frequency switcher, but with better specifications and at a more economical price. * Efficiency 80% * Small dimensions * Fast response, low ripple * Natural convection cooling, no blower * No inrush current * Ready for programming by computer (via PSC 625 programmer) * All programming and monitor levels standardized at 0-5 V * Protected against all overload and short circuit conditions * Equal current sharing when connected in parallel and equal voltage sharing when used in series Efficiency The efficiency is very high (80%) and constant over a large output range. At no load the input power is less than 15 Watts. Input voltage 198-265V 50Hz +/-1 Hz (for use at 220 and 50Hz line voltage) Up to 25V 10A the input voltage range is 185-265VAC. This power supply can only be used at 50 Hz because the pre-regulation is frequency dependent. Inrush current During switch-on the inrush current is kept very low to avoid stress on the input fuse and switch. Photo: AC input voltage and current during switch on. Upper diagram : Input voltage, 200V/div. Lower diagram: Input current, 5A/div. Input current The input current is 2,6 A rms at 220VAC input and 300Watts output. Input current shows no sharp peaks that can cause distortion at the line voltage. Photo: Input voltage and current at 300W output Upper diagram: Input voltage, 200V/div. Lower diagram: Input current, 5A/div. Insulation voltage Input-output 2500 Vrms Input-case 2500 Vrms Output-case 500 VDC Safety is in accordance with IEC 3^8 For extra safety the input transformer has a split bobbin with an insulation voltage of 3750Vrms