PFC275-48 Custom Power Supply from RAM Technologies


275-Watt Medical Power Supply

The PFC275-48 is a 48 Vdc 275W medical-grade ATX power supply. The power supply is specifically designed to deliver power through a distribution cable of up to 100 feet. The remote sense lines ensure tight point of load regulation with voltage drop-up to 5 volts. The PFC275-48 is cooled by dual fans with Smart Fan Technology, for ultra-low noise operation.




Cabling: Cable connectors and lengths are customized to your specifications. Please consult our Output Cable configurator or contact us for details.


Input Voltage Range: 100 to 264 Vac
Input Current: 4.5 A max
Frequency: 50/60 Hz
Inrush Current: 35A Cold
Efficiency: 75% to 80% typ
PFC Correction: Active > .95
Leakage Current: < 90uA +/-10% @ 120 Vac
Input Fuses: 2X 6.3A 250V Line & Neutral


Output Voltage: 48Vdc +/- 3%
Hold-Up Time: > 40ms @ full load
Overvoltage Protection: +15% of set voltage
Overload Protection: Manual reset
Minimum Loading: None
Peak Output Current: 7A 50ms
Load Regulation: +/-3%
Line Regulation: < 1%
Turn-On Time: < 2 sec
Auxiliary Output: 12Vdc @ 0.1A
Remote Sense Differential: +/- 5.5 Vdc

Note: Output on/off is accomplished by grounding of power-on signal. Power-on signal is internally pulled up to +5 volts through a 200k resistor and is compatible with the ATX power-on signal input.


Operating Temperature: 0 to 50°C
Storage Temperature: -40 to 80°C
Operational Humidity: 0 to 95% nc
Storage Humidity: 0 to 95% nc
Operational Altitude: -500 to 10,000 ft
Storage Altitude: -500 to 40,000 ft


MTBF (demonstrated): > 500,000 hours
Expected Life: > 8 years, when use as specified

EMC Compliance

Self-contained EMI filtering for compliance to the following standards (measured with unit mounted in chassis):

EN61000-4-2 ESD Level 3
EN61000-4-3 RF Susceptibility 3v/m
EN61000-4-4 EFT Level 3
EN61000-4-5 Surge Level 3
EN61000-3-2 Harmonics
EN61000-3-3 Flicker
EN61000-4-11 Voltage Dips, Short Interruptions
EN55011 Conducted and Radiated Emissions, Class B

Standards Compliance

IEC/ ES60601-1 2nd edition
UL file E191947 ISO9001:2008
Lead-free RoHS and REACH compliant
ECCN# EAR99 Conflict Material compliant
Patient Protection: Two MOPP


Note: To meet class B, two ferrites (28A2029-0A0 & 28A0807-0A2) must be added to the output cable.

A QSB-80-01 EMI fan filter must be added to the internal fan. Refer to output cable drawing for placement of ferrite clamps.