AC-DC
Specification
350/420 Watts
•U-Channel, Cover Fan & Hotswap Formats
•Power Density up to 12.8 W/in3
•Power Fail, DC OK & Active Current Share
•5 V Standby Outputs
•12 V Fan Supply Outputs
•Screw Terminals Available
•3 Year Warranty
MFA Series
Input
Input Voltage • 85-264 VAC
(derate output power 10% below 90 VAC)
Input Frequency • 47-63 Hz
Input Current • Typically 3.6 A at 115 VAC &
1.8 A at 230 VAC
Inrush Current • <60 A max at 230 VAC cold start at 25 °C
Power Factor • >0.9
Earth Leakage Current • Typically 1 mA at 230 VAC/50 Hz,
0.5 mA at 115 VAC/60 Hz
Input Protection • T6.3 A/250 V fuse in line
Output
Output Voltage • See tables
Output Voltage Trim • ±10%
Initial Set Accuracy • V1 ±1%, V2 ±5%, V3 ±3%
Minimum Load • No minimum load required
Start Up Delay • 2 s maximum, typically 1 s
Hold Up Time • 16 ms minimum at 90 VAC full load
Drift • ±0.2% after 20 min warm-up
Line Regulation • V1 ±0.5%, V2 ±3.0%, V3 ±0.5%
Load Regulation • V1 ±1.0%, V2 ±5.0%, V3 ±1.0%,
0-100% load V1 & V3, 10-100% load V2
Over/Undershoot • <1% maximum
Transient Response • <4% max deviation,with 50-75-50% load
step. Recovery to within 1% <500 µs
Ripple & Noise • V1 & V3: 1%, V2: 2% pk-pk,
20 MHz bandwidth
Overvoltage Protection • 115-140% Vnom (on V1 only)
Overtemperature • Thermal sensor under PCB shuts unit
Protection down typically >+75 °C, restarts after
cooling
Overload Protection • 110-140%, I nom V1
Short Circuit Protection • Continuous trip and restart (hiccup mode)
Temperature • 0.05%/ºC
Coefficient
Remote Sense • Compensates for 0.5 V total voltage drop
Remote On/Off • Short circuit or TTL Low turns PSU off, can
also be configured as enable
Current Share • Up to 3 supplies can be connected in
parallel, derate total output current to 90%
xppower.com
General
Efficiency • Typically 86%
Isolation • 3000 VAC Input to Output
1500 VAC Input to Ground
100 VDC Output to Ground
Switching Frequency • PFC 62 kHz typical,
Main converter 157 kHz, typical
Power Density • 11.1 W/In3 (MFA350), 12.8 W/In3 (MFA420)
Signals • Power Fail - open collector, transistor off
for AC good, ≥5 ms warning of loss of
output. DC OK - open collector, transistor
off for DC good
MTBF • 460 kHrs to MIL-HDBK-217F, notice 2,
at +25 °C, GB, typical
Environmental
Operating Temperature • Forced cooled: -10 °C to +70 °C, derate
linearly from +50 °C at 2.5%/°C to +70 °C
Cooling • >13 CFM forced airflow required for U
Channel Versions, ‘-H’, ‘-TF’ & ‘-EF’
versions have integral fan
Operating Humidity • 5-95% RH
Storage Temperature • -20 °C to +85 °C
Operating Altitude • 3000 m
Shock • 30 g pk, half sine, 6 axes
Vibration • Single axis 10-500 Hz at 2 g x 10 sweeps
EMC & Safety
Emissions • EN55022, class B conducted,
class A radiated
Harmonic Currents • EN61000-3-2 class A
EN61000-3-2 class C for loads ≥20%
Voltage Flicker • EN61000-3-3
Radiated Immunity • EN61000-4-3, level 3 Perf Criteria A
EFT/Burst • EN61000-4-4, level 3 Perf Criteria A
Surge • EN61000-4-5, installation class 3
Perf Criteria A
Conducted Immunity • EN61000-4-6, 10 V rms Perf Criteria A
Dips & Interruptions • EN61000-4-11, 30% 10 ms, 60% 100 ms,
100% 5000 ms, Perf Criteria A, B, B
Safety Approvals • CB Report, IEC60950-1,
CSA22.2 No. 60950-1-05,
UL60950-1, TUV EN60950-1/A11