DFC25 Single-Output DC-DC Series Data Sheet
Description
The DFC25 Series dc-dc converter provides tightly-regulated output
voltages for industrial and datacom applications from 24 or 48 Volt
inputs. Available output power ranges from 24.75 to 30 watts. Excellent
noise performance is attained via an aluminum case, toroidal
magnetics, and double shielded transformers. Common mode and
differential mode input filtering is integral to the design. Selected
models provide 1544 volts isolation from the input to output.
The input and output sections of the DFC25 Series are protected from
overvoltage transients via internal circuitry. Same voltage models of the
DFC25 family may be connected in parallel to achieve additional output
current.
Features
• RoHS lead solder exemption compliant
• Up to 30 watts output power
• Remote On/Off
• Common and differential mode input filters
• +5 or +12V outputs
• Remote voltage sense
• Efficiencies to 81%
• Operation from -25 °C to 85 °C
• 700/1544 V Isolation
• Two-year warranty
• UL/CSA/TÜV
BOTTOM VIEW
Selection Chart
Model
DFC25E24S5
DFC25E48S5
DFC25E48S12
Input Range
VDC
Min
Max
18
36
36
36
72
72
Output
VDC
Nominal
5
5
12
Output
mA MAX
6000
6000
2500
2.50
(63.5)
2.75
(70.0)
9
8
7
6
5
SIDE VIEW
0.040 (1.02) DIA
9 PLACES
Model numbers highlighted in yellow or shaded are
not recommended for new designs.
3.00
(76.2)
General Specifications
(1)
All Models
Isolation (3)
Isolation Voltage
Input to Output
24V Input
48V Input
10µA Leakage
Input to Output Capacitance
Remote ON/OFF
ON Logic Level or Pin Open
Off Logic Level or Tie to -Input
Converter Idle Current
Output Trim Function
Input Resistance
Programming Range
Environmental
Case Operating Range (2)
Case Functional Range
Storage Range
Thermal Impedance
General
MTBF (Calculated)
Unit Weight
TYP
TYP
1,000,000
2.6/71
Hours
oz/gm
MIN
MAX
MIN
MAX
MIN
MAX
TYP
-25
+60
-40
+105
-45
+105
10
°C
°C
°C
°C/Watt
TYP
MIN
40
±10
k
%
MIN
MAX
TYP
2.5
0.7
10
Volts
Volts
mA
MIN
MIN
TYP
700
1544
700
Volts
pF
PIN CONNECTIONS
PIN NUMBER
PIN OUT
1
-INPUT
2
+INPUT
3
N/C
4
ON/OFF
5
TRIM
6
+OUTPUT
7
-OUTPUT
8
N/C
9
N/C
0.00
Units
0.25
(6.3)
0.00
1
2
4
0.85
(21.6)
1.25
(31.8)
1.65
(42.0)
0.38
(9.65)
0.000
0.45
(11.4)
2.05
(52.1)
NOTE:
All pins are 0.040"
diameter brass with tin plating.
Mechanical tolerances unless
otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
NOTES
(1) All parameters measured at 25 °C, nominal input voltage, and full rated load unless
otherwise noted.
(2) Derate linearly to 0 Watts at 105 °C ambient. Operation to +70 °C ambient with
externally supplied forced-air cooling, 100 LFM.
(3) Case is tied to -Input, Pin 1.
REV. JAN 25, 2006
Page 1 of 2
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0.43
(11.0)
DFC25 Single-Output DC-DC Series Data Sheet
Input Parameters (1)
Model
Reflected Ripple (2)
Input Current
Full Load
No Load
Inrush Current (4)
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
100ms Maximum
Turn-on Time,
1% Output Error
TYP
TYP
TYP
MAX
TYP
TYP
MAX
TYP
DFC25E24S5
230
1563
10
50
80
150
45
10
DFC25E48S5
150
781
10
50
80
150
85
10
DFC25E48S12
150
762
10
50
82
150
85
10
Units
mA
PP
mA
A
PK
%
kHz
VDC
ms
Output Parameters (1)
Model
Output Voltage
Output Voltage Accuracy
MIN
TYP
MAX
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
TYP
TYP
DFC25E24S5
5
5.05
5.10
5.15
0.60
6.00
1
0.2
2
<0.05
<0.1
>40
75
100
DFC25E48S5
5
5.05
5.10
5.15
0.60
6.00
1
0.2
2
<0.05
<0.1
>40
75
100
DFC25E48S12
12
11.90
12.00
12.10
0.25
2.50
1
0.2
2
<0.05
<0.1
>40
75
100
Units
VDC
VDC
A
%
%
%
%/24Hrs
%/kHrs
dB
mV
PP
ppm/°C
Rated Load Range
Load Regulation
10% Load - Max Load
Line Regulation
Vin = Min-Max VDC
Transient Response
25% Load Step (5)
Short Term Stability (3)
Long Term Stability
Input Ripple Rejection
Noise, Peak - Peak (2)
Temperature Coefficient
Short Circuit Protection
from +OUT to -OUT
Continuous, Current Limit Protection
DFC25 SERIES APPLICATION NOTES:
External Capacitance Requirements
A low ESR external capacitance is required for operation of the DFC25 Series. For maximum
performance, it is recommended that the DFC25 Series use a capacitor of sufficient ripple
current capacity connected across the input pins, especially if a capacitive input source is farther
than 1" from the converter. To meet the reflected ripple requirements of the converter, an input
impedance of less than 0.09 Ohms at 200 kHz is required. External output capacitance is not
required for operation, however it is recommended that 1μF to 10μF of Tantalum and 0.001 to
0.1μF ceramic capacitance be selected for each output to reduce system noise. Additional
output capacitance may be added for increased filtering, but should not exceed 400μF.
Remote ON/OFF Operation
The remote ON/OFF pin may be left floating if this function is not used. It is recommended to
drive this pin with TTL compatible circuitry. When the ON/OFF pin is pulled low with respect to
the -INPUT, the converter is placed in a low power drain state. The input capacitors are kept
fully charged in the OFF mode. For proper operation, this input may be driven from a logic gate
directly. The ON/OFF pin should never be pulled more than 0.3 volts below -INPUT or have a
voltage greater than +6 volts applied.
NOTES
(1) All parameters measured at Tc=25°C, nominal input voltage and full rated load unless
otherwise noted.
(2) Measurement bandwidth is 0-20 MHz for peak-peak measurements, 10 kHz to 1 MHz for
RMS measurements. Output noise is measured with a 0.01μF/100V ceramic capacitor in parallel
with a 1μF/35V Tantalum capacitor, 1 inch from the output pins to simulate standard PCB
decoupling capacitance.
(3) Short-term stability is specified after a 30 minute warm-up at full load, constant line and
recording the drift over a 24-hour period.
(4) Per ETSI-300-132
(5) Recovery to within 1% in less than 1 millisecond after transient has been applied.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components
in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective
divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
REV. JAN 25, 2006
Page 2 of 2
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