DC-DC
365 Watts
DFA Series
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xppower.com
U Channel and Hotswap DC-DC Converter
-48 VDC Input
DC Input version of MFA350 AC-DC Converter
-10
°C to + 70 °C Operation
Power Fail and DC OK Signals
High Power Density up to 11.1 W / in
3
5 V Standby and 12 V Fan Supply Outputs
Specification
Input
Input Voltage Range
Input Current
Input Reverse Voltage
Protection
Undervoltage Lockout
Protection
• 48 VDC nominal (36 - 75 VDC).
Can be configured as -48 VDC input
• 9.2 A typical, 12.5 A max
• Continuous protection with
automatic recovery
• 32 - 36VDC
General
Efficiency
Isolation Voltage
• 85% typical
• 1500 VDC Input to Output,
1000 VDC Input to Ground,
500 VDC Output to Ground.
• 370 kHz typical
• 11.1 W/In
3
Switching Frequency
Power Density
Output
Output Voltage
Output Voltage Trim
Minimum Load
Line Regulation
Load Regulation
Setpoint Accuracy
Turn-on Time
Transient Response
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See table
±10% via potentiometer
No minimum load required.
±0.5% of nominal with input variation of
36-75V DC
±1% of nominal with load variation
0-100%
±1% of nominal with 48 VDC input
and 50% load
1 s typical from application of DC input
<4% deviation with a 50-75-50% load
change at 1 A/µs. Output returns to within
1% in less than 500 µs
1% max pk-pk 20 MHz bandwidth,
0.1 µF capacitor connected across
measurement points
115-140% of nominal,
recycle input DC to reset
105-115% of max current
Continuous protection, trip and restart
(Hiccup mode) characteristic
0.02%/°C (after 20 minute warm up)
Environmental
Operating Temperature
• -10 °C to +50 °C with full load, derate
linearly to 50% load at 70 °C forced cooled.
Cooling
• >20 CFM forced airflow required
-H versions have integrated fan
Operating Humidity
• 0 to 95% RH non condensing.
Storage Temperature
• -40 °C to +80 °C.
Storage Humidity
• 0 to 95% RH non condensing.
Operating Altitude
• 3000m.
Shock
• ±3 shocks in each axis (total 18 shocks)
30 g 11ms (half sine).
Vibration
• 2 g, 10 - 500Hz 10 sweeps.
EMC & Safety
Emissions
EFT/Burst
Surge
Conducted Immunity
Safety Approvals
• Compliant with EN61204-3 2000,
EN55022 class A conducted & radiated
• Compliant with EN61000-4-4 level 1 Perf
Criteria A
• EN61000-4-5 level 1 Perf Criteria A,
• Compliant with EN61000-4-6 level 2 Perf
Criteria A
• UL60950-1 (2003), CE Marked to LVD
Ripple & Noise
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Overvoltage Protection
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Overcurrent Protection
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Short Circuit Protection
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Temperature
Coefficient
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DC-DC
Models and Ratings
Output Voltage
V1
12 VDC
24 VDC
Max Output Current
V1
29.0 A
14.5 A
Fan Output
V2
12 V/1 A
12 V/1 A
Standby Supply
V3
5 V/1 A
5 V/1 A
Max Power
20 CFM Airflow
365 W
365 W
DFA350
Model
Number
DFA35048S12
DFA35048S24
Mechanical Details (U Channel)
A
A
8 X M3-0.5 MOUNTING THREAD
0.236(6.0) MAX SCREW PENETRATION
TYP ON ALL SIDES OF POWER SUPPLY
6.80
(172.7)
LOGIC
CONNECTOR
AIRFLOW
3.20
(81.3)
VOLTAGE ADJUST
V1 (+)
DC OUTPUT
INTERFACE CONNECTOR
V1 (-
)
VA
(PRIMARY INPUT)
48 VDC
INPUT BLOCK
+
-
12 VOLT FAN CONNECTOR
1.50
(38.1)
2 X 0.75
(19.1)
A
A
2 X 0.60
(15.2)
2 X 5.80
(147.3)
2 X 0.60
(15.2)
A
A
2 X 2.00
(50.8)
A
A
0.60
(15.2)
2 X 5.80
(147.3)
Pin
1
2
3
4
5
6
7
8
9
10
Logic Connector
Function
DC IN OK
Inhibit / Enable
Not used
DC OK
Not used
+Sense
-Sense
Not used
5 V Standby
5 V Standby Return
Logic Connector: JST PN B10B-PHDSS(LF)(SN)
Mating Plug: JST PN PHDR-10VS
Contact, 26-22 AWG: JST PN SPHD-001T-P0.5
DC-DC
Thermal Considerations (U Channel)
DFA350
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 drawing on 2nd page of this datasheet 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.
Temperature Measurements (Ambient
≤50
ºC)
Component
L1
Q1
HS1
C25
Q2
Max Temperature ºC
90 ºC
105 ºC
85 ºC
75 ºC
105 °C
Signals DFA350 & DFA350-H
Input Fail
POWER SUPPLY
5 V Standby
Pin 9 or C3
330R
Max 12 V 20 mA
AC OK Collector
Pin 1 or B3
Transistor On (<0.8 V): AC NOT OK
Transistor Off (>4.5 V): AC OK
AC OK Emitter
Pin 7 or B1
5 V Standby
Return Pin 10
or D3
J3 Logic Connector
DC OK
POWER SUPPLY
5 V Standby
Pin 9 or C3
330R
Max 12 V 20 mA
DC OK Collector
Pin 4 or A3
DC OK Emitter
Pin 7 or B1
Transistor On (<0.8 V): DC NOT OK
Transistor Off (>4.5 V): DC OK
5 V Standby
Return Pin 10
or D3
J3 Logic Connector
See 2nd page of
this datasheet
Mechanical Details
for location
Remote On/Off (Inhibit/Enable)
POWER SUPPLY
Internal
Vref
JP1
Jumper (JP1) fitted (standard)
Open or TTL high=PSU On
Short circuit or TTL Low=PSU Off
Jumper (JP1) removed
Open or TTL high=PSU Off
Short circuit or TTL Low=PSU On
Pin 2
or D2
Pin 7 or B1
J3 Logic Connector
31-Oct-08
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