Ø  Universal input 80~264Vac or 113~370Vdc Ø  Built-in Active PFC, PF≥0.95 Ø  400W convention, 550W forced air Ø  No load power consumption<0.5W by PS­_ON/OFF Ø  Extremely low leakage current≤0.1mA Ø  12V/0.5A fan supply Ø  Output protections: SCP/OVP/OCP/OTP Ø  Wide operating ambient temperature (-40℃~70℃) Ø  Operating altitude up to 5000m Ø  5’’*3’’ Compact size Ø  Meet medical safety(2*MOPP) Ø  Fit for Class I & Class II configuration Ø  3 years warranty MODEL PSF-550S-12 PSF-550S-24 PSF-550S-36 PSF-550S-48 PSF-550S-54 OUTPUT DC Output 12V 24V 36V 48V 54V Rated Current (Convection) 33.4A 16.7A 11.1A 8.34A 7.4A Rated Current (16CFM forced air) 41.7A 22.9A 15.3A 11.46A 10.2A Rate Power(Convection) 400.8W 400.8W 399.6W 400.3W 399.6W Rate Power(16CFM forced air) 500.4W 549.6W 550.8W 550W 550.8W Ripple and Noise @25℃ Note 2 ≤200mVp-p Voltage ADJ.  Range 11.4~12.6V 22.8~25.2V 34.2~37.8V 45.6~50.4V 50.5~54V Voltage Accuracy ±2% Line Regulation ±1.0% Load Regulation ±1.0% Set-up Time ≤1.0S (230Vac input, Full load) Hold up Time 8mS @115/230Vac input   Full load Temperature Coefficient ±0.02%/℃ Overshoot <5.0% INPUT Voltage Range   Note 3 80~264Vac or 113～370Vdc Rated input voltage range 100~240Vac Frequency Range 47Hz-63Hz Efficiency ( Typical) 93.5% 94% 94% 94% 94% Power Factor(Typical) ≥0.95 @ 100~240Vac  full load AC Current (max.) ＜6.5A Inrush Current (Typical) ＜40A@115Vac ; ＜80A @ 230Vac      Cold start Leakage Current Touch current ≤0.1mA   @ ac input to dc output PROTECTION Over Current 110%~150%, hiccup mode, recovers automatically after fault condition is removed Over Voltage 110%~130%, constant voltage, recovers automatically after fault condition is removed Over temperature Shut down o/p voltage, recovers automatically after temperature goes down Short Circuit Long-term mode, auto recovery ENVIRONMENT Operating amb. Temp. & Hum. -40℃~70℃;  20%~90%RH  No condensing (refer to the derating curve) Storage Temp. & Hum. -40℃~85℃;  10%~95%RH  No condensing Operating altitude (Note 3) 5000 meters SAFETY &EMC   (Note 4) Safety Standards IEC62368 / IEC60601 Withstand Voltage Primary-Secondary: 4KVac/5mA; Primary to PG: 2.0KVac/5mA; Secondary-PG: 1.5Vac/5mA Isolation Resistance 100M ohms EMI Conduction&Radiation Compliance to EN55032 Class B(Class I); Harmonic Current Compliance to EN61000-3-2, Class A EMS Immunity Compliance to EN61000-4-2,3,4,6,11; OTHERS MTBF (MIL-HDBK-217F) More than 200,000Hrs (25℃) 5V standby 5V/1A,tolerance ±2%, ripple : 120mVp-p(max.) PS_ON/OFF Power ON: PS-ON/OFF, "Hi" or " > 2 ~ 5V" ; Power OFF: PS-ON/OFF,"Low" or " < 0 ~ 0.5V" POWER GOOD / POWER FAIL 500ms>PG>10ms ; The TTL signal goes high with 10ms to 500ms delay after power set up ; The TTL signal goes low at least 1ms before Vo below 90% of rated value Dimension  (L*W*H) 127*76.2*40.5mm (5’’*3’’*1.59’’ inch) Packing TBD Cooling method 400W free air convection; 550W with 16CFM forced air NOTE 1.     All parameters NOT specially mentioned are measured at rated input, rated load and 25℃ of ambient temperature. 2.     Measured at 20MHz of bandwidth by using a12”twisted pair-wire terminated with a 0.1 uF & 10uF parallel capacitor. 3.     The ambient temperature derating of 0.5℃/100m for operating altitude higher than 2000m. 4. The power supply is considered as a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives.