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
AC-DC
MFA350/420
Models and Ratings
Output Voltage V1 Output Current V1 Fan Output V2 (2) Standby Supply V3 Output Power 13 CFM Airflow Model Number(1)
12 VDC 29.0 A 12 V/1 A 5 V/0.3 A 361 W MFA350PS12
24 VDC 14.5 A 12 V/1 A 5 V/0.3 A 361 W MFA350PS24
48 VDC 7
.3 A 12 V/1 A 5 V/0.3 A 364 W MFA350PS48
12 VDC 35.0 A 12 V/1 A 5 V/0.3 A 434 W MFA420PS12
24 VDC 17.5 A 12 V/1 A 5 V/0.3 A 434 W MFA420PS24
48 VDC 8.8 A 12 V/1 A 5 V/0.3 A 436 W MFA420PS48
Mechanical Details
Notes
1. Units supplied with AMP/TE connections for J1 & J2 as standard. Add suffix ‘-S’ to model number to replace with screw terminals. Add suffix ‘-TF’ for covered
version with top fan and suffix ‘-EF’ for covered version with end fan. Example:- MFA420PS12-STF, 12 V unit fitted with screw terminals and top fan.
2. Not available for -TF & -EF versions.
3.20
(81.3)
1.50
(38.1)
3.20
(81.3)
AIRFLOW 2 x 2.00
(50.8)
2 x 0.60
(15.3)
6.80 (172.7)
AC Input
Interface Conn 2 x
0.60 (15.2)
2 x 1.50
(38.1)2 x 0.75
(19.1)
2 x
0.60 (15.2)
6.80 (172.7)
2 x 5.80 (147.3)
2 x 5.80 (147.3)
Logic Connector
Voltage Adjust
DC output interface
connector
V1(+)
V1(-)
8 X M3-0.5 Mounting Thread
0.236 (6.0) Max Screw Penetration
Typ on all sides of power supply
Max Torque 4.0 - 5.0 in-lb
(0.045 -0.057 kg-m)
A
A
A
A
BR1
T3
L3
J4
1
2E1
E2
J3
JP1 12
10
D35
A
AA
A
JP1 (Enable)
Fan Connector V2
C63
C8
Screw Terminal Option Available
Add Suffix -S to Model Number
Max Torque 1.73 in-lb (0.02 kg-m)
0.80
(2.02)
0.6 (15.2) 5.8 (147.3)
0.663
(16.8)
2.0
(50.8)
ACL
GND
5
3J1
1
3.326
(84.5)
3.326
(84.5)
2.0
(50.79)
2.0
(50.79)
AC Input
Interface Conn 6.800 (172.72)
V1(-)
V1(+)
Logic
Connector
Voltage
Adjust
Output
Interface
Connector
4 x M3-0.5 Mounting Thread, 0.236 (6.0) Max Screw
Penetration, Bottom Side of Power Supply,
Max Torque 4.0 - 5.0 in-lb (0.045 - 0.057 kg-m)
5 x M3-0.5 Mounting Thread
0.236 (6.0) Max Screw Penetration
Bottom Side of Power Supply
Max Torque 4.0 - 5.0 in-lb (0.045 -0.057 kg-m)
8.280 (210.31)
0.80
(2.03)
0.60
(15.2)
0.663
(16.84)
3.326
(84.48)
2.0
(50.80)
1.375
(34.92)
3.326
(84.47)
1.750
(44.45)
AC Input
Interface Conn
GND
1.750
(44.45)
8.200
(208.28)
6.80
(172.7)
V1(-)
V1(+)
0.400
(10.16)
5.800 (147.32)
1.750
(44.45)
7.200 (182.88)
8.200 (208.28)
Output Interface Connector
Voltage Adjust
Logic Connector
ACL
AIRFLOW
AIRFLOW
U Channel
Top Fan (Suffix TF)
PIN CONNECTIONS AC INPUT
J1 AMP/TE CONN = 640445-5
1 GND
3 Neutral
5 Line
PIN CONNECTIONS DC OUTPUT
J2 AMP/TE CONN = 1-640445-0
PIN FUNCTION PIN FUNCTION
1 +V1 6 -V1
2 +V1 7 -V1
3 +V1 8 -V1
4 +V1 9 -V1
5 +V1 10 -V1
Mating Parts: AMP/TE CONN = 1-640250-0
Contact 350980-1,
Option ‘-S’ screw terminals
2 x Phoenix Contact: MKDS 1/5-3.81 or similar
accepts 26-16 AWG wire
Max Torque 1.73 in-lb (0.02 kg-m)
Mating Parts: AMP/TE CONN Housing = 640250-5
Contact 350980-1,
Option ‘-S’ screw terminals
Phoenix Contact: MKDS 1/5-3.81 or similar
accepts 26-16 AWG wire (contacts 2 & 4 removed)
Max Torque 1.73 in-lb (0.02 kg-m)
PIN CONNECTIONS LOGIC CONNECTOR
J3 JST B10B-PHDSS (LF) (SN)
PIN FUNCTION PIN FUNCTION
1 AC OK 6 +Sense
2ROF
(Inhibit/Enable) 7 -Sense
3 Current Share 8 Not Used
4 DC OK 9 5 V Standby V3
5 Not used 10 5 V Standby
Return V3
Mating Parts: JST, Housing PHDR-10VS
Contact SPHD-001T-P0.5
Mating Parts: Molex, Housing 22-01-1024
Contact 08-70-0057
PIN CONNECTIONS FAN OUTPUT
J4 Molex 22-04-1021
1 +V2
2 -V2
Notes
1. All dimensions in inches (mm).
2. Tolerance: .xx=±0.02 (±0.50); .xxx=±0.01 (±0.25)
End Fan (Suffix EF)
Weight: 1.7 lb (771 g) approx
Weight: 1.35 lb (612 g) approx
Weight: 1.7 lb (771 g) approx
AC-DC
MFA350/420
Output Voltage V1 Output Current Standby Supply V3 Output Power Model Number
12.0 VDC 29.0 A 5 V/0.3 A 350 W MFA350PS12-H
24.0 VDC 14.5 A 5 V/0.3 A 350 W MFA350PS24-H
48.0 VDC 7
.3 A 5 V/0.3 A 352 W MFA350PS48-H
12.0 VDC 35.0 A 5 V/0.3 A 434 W MFA420PS12-H
24.0 VDC 17.5 A 5 V/0.3 A 434 W MFA420PS24-H
48.0 VDC 8.8 A 5 V/0.3 A 436 W MFA420PS48-H
IEC320 INPUT CONNECTOR
AC INPUT &
DC OUTPUT
HEALTHY LED’S
EJECTOR HANDLE
OUTPUT CONNECTOR
0.125
(3.18)
1.60
(40.6)
GUIDE PIN C/L
0.655
(16.64)
0.385
(9.78)
10.06 (255.52)
10.00 (254.0)
ø0.156 (3.96) EJECTOR PIN
R0.225 (5.71) ROTATION RADIUS
0.225
(5.72)
0.175
(4.44)
CONNECTOR C/L
3.30
(83.8)
MAX
1.636
(41.55)
Pin Connections
PIN CONNECTIONS
INPUT CONNECTOR IEC320
Earth
Live
Neutral
V
Mating parts: FCI 51762-10401200AA-LF
PIN CON. OUTPUT CON.
FCI 51732-035-LF
A1 +Sense
A2 Not Used
A3 DC OK
B1 -Sense
B2 Not Used
B3 AC OK
C1 Current Share
C2 Not Used
C3 5 V Standby V3
D1 Not Used
D2 ROF (Inhibit/Enable)
D3 5 V Standby Return V3
P1 -V1
P2 -V1
P3 +V1
P4 +V1
PIN CONNECTIONS
OUTPUT CONNECTOR
123
D
C
B
A
P1 P2 P3 P4
Viewed looking at PSU male partViewed looking at PSU male part
Mechanical Details
Models and Ratings
-H Hotswap
Notes
1. All dimensions in inches (mm).
2. Weight: 2.65 lb (1202 g) approx
3. Tolerance: .xx=±0.02 (±0.50); .xxx=±0.01 (±0.25)
03-Jun-16
AC-DC
MFA350/420
Thermal Considerations (U Channel)
AC OK Collector
Pin 1 or B3
AC OK Emitter
Pin 7 or B1
POWER SUPPLY
Transistor On (<0.8 V): AC NOT OK
Transistor Off (>4.5 V): AC OK
J3 Logic Connector
330R
5 V Standby
Return Pin 10
or D3
5 V Standby
Pin 9 or C3
Max 12 V 20 mA
DC OK Collector
Pin 4 or A3
DC OK Emitter
Pin 7 or B1
POWER SUPPLY
Transistor On (<0.8 V): DC NOT OK
Transistor Off (>4.5 V): DC OK
J3 Logic Connector
330R
5 V Standby
Return Pin 10
or D3
5 V Standby
Pin 9 or C3
Max 12 V 20 mA
POWER SUPPLY
J3 Logic Connector
Pin 7 or B1
Pin 2
or D2
Jumper (JP1) fitted (standard)
Open or TTL high=PSU On
Short circuit or TTL Low=PSU Off
Internal
Vref
JP1
See 2nd page of this datasheet
Mechanical Details for location
Jumper (JP1) removed
Open or TTL high=PSU Off
Short circuit or TTL Low=PSU On
AC OK/Power Fail DC OK Remote On/Off (Inhibit/Enable)
MFA Temperature Measurements (Ambient 50°C)
Component Max Temperature °C
T3 90 °C
BR1 105 °C
D35 85 °C
L3 90 °C
C8 105 °C
C63 105 °C
Signals
DFA Temperature Measurements (Ambient 50°C)
Component Max Temperature °C
L1 90 °C
Q1 105 °C
HS1 85 °C
C25 75 °C
Q2 105 °C
In order to ensure safe operation of the PSU in the end-use equipment, the temperature of the components listed in the table below must not be
exceeded. See mechanical details for component locations. The temperature should be monitored using K type thermocouples placed on the hottest
part of the component (out of any direct air flow). See longform datasheet for further information of service life.