DFC15 Single-Output DC-DC Series Data Sheet
Description
The DFC15 Series of DC-DC converters is designed
to provide a wide range of PCB power solutions. The
converters feature dual-output filters for low noise.
Trim and remote On/Off features give flexibility to
designs. The output of the converter is electrically
isolated, thereby allowing the output to be configured
as a positive or negative output voltage. The ultra-
wide input range, from 20 to 60 volts, allows use in
many industrial and communication applications.
Model Selection
Model
DFC15U48S5
DFC15U48S12
DFC15U48S15
Input Range
VD C
Min
20
20
20
Max
60
60
60
Output
VDC
5
12
15
Output
mA
3000
1250
1000
Features
• RoHS lead solder exemption compliant
• Up to 15 watts output power
• Efficiencies to 83%
• Very low Off current
• 700 V isolation
• Dual-stage output filter
• -40 °C to +90 °C operation
• Ultra-wide range input (3:1)
• Remote On/Off and Trim
BOTTOM VIEW
2.02
(51.31)
1.100
(27.94)
0.700
(17.78)
0.600
(15.24)
0.400
(10.16)
0.300
(7.62)
0.000
0.100
(2.54)
0.31
(7.9)
0.11
(2.8)
0.000
4
SIDE VIEW
0.040 (1.02) DIA
7 PLACES
Model numbers highlighted in yellow or shaded are not recommended for
new designs.
5
1
2
6
1.62
(41.15)
General Specifications (1)
All Models
ON/OFF Function (2)
OFF Logic Level
or Pin Open
OFF Logic Level
Input Resistance
Converter Idle Current
ON/OFF Pin Low
Isolation (3)
Isolation Voltage
Input to Output
10
μ
A Leakage
Input to Output
Capacitance
Output Trim Function
Input Resistance
Open Circuit Voltage
Environmental
Case Operating Range, Tc
No Derating
Storage Range
Thermal Impedance (5)
General
MTBF (Calculated)
Unit Weight
Chassis Mounting Kit
Notes
Units
3
7
MIN
MAX
TYP
TYP
8.0
2.0
100
<1
VD C
VD C
Kohms
mA
0.3
(7.62)
1.800
(45.72)
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
MIN
TYP
700
300
VDC
pF
Pin
1
2
3
4
5
6
7
Function
+INPUT
-INPUT
ON/OFF
NO PIN
+OUT
-OUT
TRIM
TYP
MIN
MIN
MAX
MIN
MAX
T YP
TYP
TYP
20
±5
- 40
90
-55
1 05
10
800,000
2/57
CM2A1
Kohms
%
¡C
¡C
¡ C/Watt
HRS
oz/gm
(1) All parameters measured at Tc = 25°C, nominal input voltage and full rated load unless otherwise noted.
(2) The ON/OFF pin is the Open Collector TTL, CMOS, and relay compatible. The input to this pin is referenced to Pin 2 (-Input)
and is protected to +75VDC.
(3) The Case is tied to Pin 3, +Input pin.
(4) The case thermal impedance is specified as the case temperature rise over ambient per package watt dissipated.
MCD10177 Rev. 1.0, 16-Jun-10
Page 1 of 4
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0.55
(13.97)
0.000
DFC15 Single-Output DC-DC Series Data Sheet
Input Parameters
(1)
Model
Voltage Range
Input Current
Full Load
N o L oa d
MIN
T YP
MAX
TYP
T YP
TYP
T YP
MAX
TYP
5
DFC15U48S5
DFC15U48S12
20.0
48.0
60.0
915
4
82
120
75
10
DFC15U48S15
Units
VDC
905
4
83
mA
%
kHz
VDC
ms
Efficiency
Switching Frequency
Maximum Input Overvoltage, 100ms
No Damage
Turn-on Time, 1% Output Error
95 0
2
79
Output Parameters
(1)
Model
Output Voltage
Rated Load (3)
Voltage Range
100% Load
Load Regulation
25-100% Full Load
Line Regulation
Vin = Min-Max VDC
Short Term Stability (4)
Long Term Stability
Input Ripple Rejection (5)
Noise, 0-20MHz bw (2)
RMS Noise
Temperature Coefficient
Short Circuit Protection
+OUT to -OUT
MIN
MAX
MIN
T YP
MAX
T YP
MAX
TYP
MAX
T YP
TYP
TYP
TYP
TYP
T YP
MAX
75
3
DFC15U48S5
5
0
3000
4.95
5.00
5.05
0.5
0.75
0.1
0.15
DFC15U48S12
12
0
1 25 0
11.90
12.00
12.10
0.1
0.2
0.01
0.1
< 0.02
< 0.05
> 60
60
2
50
150
Continuous Current Limit
60
2
DFC15U48S15
15
0
10 0 0
14.90
15.00
15.10
0. 1
0. 2
0.01
0.1
Units
VDC
mA
VDC
%
%
%/24Hrs
%/kHrs
dB
m V
P P
mV
rms
ppm/
°C
Notes
(1) All Parameters measured at Tc=25°C, nominal input voltage
and full rated load unless otherwise noted.
(2) Noise measurement bandwidth is 0-20 MHz. RMS noise is
measured over a 0.01-1 MHz bandwidth. To simulate standard
PCB decoupling practices, output noise is measured with a
1μF/35V tantalum capacitor located 1 inch away from the
converter.
(3) Minimum load required for rated regulation only. Dynamic
response may degrade if run at less than 25% full load.
(4) Short term stability is specified after a 30-minute warmup at full
load, and with constant line, load and ambient conditions.
(5) The input ripple rejection is specified for DC to 120 Hz ripple
with a modulation amplitude of 1% Vin.
MCD10177 Rev. 1.0, 16-Jun-10
Page 2 of 4
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DFC15 Single-Output DC-DC Series Data Sheet
DFC15 SERIES BLOCK DIAGRAM
SHIELDED ISOLATION TRANSFORMER
OUTPUT POWER DERATING
15
5
+
+
+ OUTPUT
POWER OUTPUT
10
+ INPUT
1
– INPUT
2
CURRENT
MODE
PWM
6
- OUTPUT
+
ON/OFF
7
TRIM
5
3
ISOLATED
FEEDBACK
–
FIVE SIDED SHIELDED COPPER CASE
LOW TC
BANDGAP
REFERENCE
0
40
60
70
80
50
AMBIENT TEMPERATURE
90
DFC15 Series Application Notes:
External Capacitance Requirements
No external capacitance is required for operation of the DFC15 Series. However, for maximum performance, it is
recommended that the DFC15 Series use a capacitor of sufficient ripple current capacity connected across the input
pins 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 0.05 Ohms from DC to 200 kHz is required. External output capacitance
is not required for operation, however it is recommended that 1
μF
to 10
μF
of tantalum and 0.001 to 0.1
μF
ceramic
capacitance be selected for reduced system noise. Additional output capacitance may be added for increased
filtering, but should not exceed 400
μF.
Negative Outputs
A negative output voltage may be obtained by connecting the +OUT to circuit ground and connecting -OUT as the
negative output.
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 an
open collector arrangement or a relay contact. When the ON/OFF pin is pulled low with respect to the -INPUT, the
converter is placed in a low power drain state. Do not drive this input from a logic gate directly; there is a 100 kV
internal pull-up resistor to a 9 volt source.
Output Trim
The TRIM pin may be used to adjust the output ±5% from the nominal setting. This function allows adjustment for
voltage drops in the system wiring, as well 5.2 volt outputs for ECL applications. Figure 1 shows the proper
connections to use this function. A trimpot value of 10 kV should be used for 5 volt outputs. A trimpot value of 20 kV
should be used for 12 and 15 volt outputs. If the TRIM function is not required, the pin may be left floating.
MCD10177 Rev. 1.0, 16-Jun-10
Page 3 of 4
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DFC15 Single-Output DC-DC Series Data Sheet
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
EFFICIENCY Vs. LINE INPUT VOLTAGE
85
50% FULL LOAD
85
90
LINE = 20VDC
EFFICIENCY Vs. LOAD
EFFICIENCY (%)
EFFICIENCY (%)
82
100% FULL LOAD
80
80
75
70
65
LINE = 48VDC
77
75
20
60
25
30
35
40
45
50
55
60
0
LINE = 60VDC
10
20
30
40
50
60
70
80
90 100
LINE INPUT (VOLTS)
LOAD (%)
INPUT RIPPLE Vs. LINE INPUT
REFLECTED RMS RIPPLE (AMPS)
1.00
1.2
INPUT CURRENT Vs. INPUT VOLTAGE
INPUT CURRENT (AMPS)
100% FULL LOAD
0.80
75% FULL LOAD
0.60
50% FULL LOAD
0.40
1.0
0.8
0.6
100% LOAD
0.4
0.2
50% LOAD
0.0
0
10
20
30
40
50
60
0.20
20
25
30
35
40
45
50
55
60
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
OUTPUT VOLTAGE Vs. OUTPUT LOAD
120
TRIM
DOWN
TRIM
7
-OUT
6
USING TRIMPOT
10K
LOAD
TRIM
7
-OUT
6
USING FIXED RESISTORS
LOAD
TRIM
UP
OUTPUT VOLTAGE (%)
+OUT
5
+OUT
5
100
80
60
40
20
0
0
20
40
60
80
100 120 140 160 180
Figure 1.
OUTPUT LOAD (%)
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.
MCD10177 Rev. 1.0, 16-Jun-10
Page 4 of 4
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