
1
BOTTOM VIEW SIDE VIEW
0.000
0.000
0.3
0.000
2.02
(51.31)
(7.62)
0.040 (1.02) DIA
7 PLACES
0.55
1.62
(13.97)
(41.15)
2
3
7
6
5
4
1.800
0.11
1.100
0.700
0.400
0.100
0.600
0.300
0.31
(10.16)
(2.54)
(7.62)
(7.9)
(27.94)
(17.78)
(15.24)
(2.8)
(45.72)
DESCRIPTION
The dual output DFC15 Series of DC/DC converters are designed
to provide a wide range of PCB power solutions where positive and
negative outputs are required. The converter features fully isolated
and filtered input and outputs for low noise. Trim and remote
ON/OFF features give flexibility to designs. The ultra-wide input
range, from 20 to 72 volts, allows use in most industrial and
communication applications.
FEATURES
• Remote ON/OFF and TRIM
• Overcurrent and Overtemperature Protected
• Water Washable Case
• Efficiencies to 82%
• 1544V Isolation
• Ultra-Wide Range Input (>3:1)
DFC15 SERIES
DUAL OUTPUT
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.010 inches
X.XXX dimensions: ±0.005 inches
NOTES
(1) All parameters measured at Tc = 25°C, nominal input voltage and full rated load unless otherwise noted.
Refer to the Technical Reference Section for the definition of terms, measurement circuits and other
information.
(2) The logic ON/OFF pin is Open Collector TTL, CMOS, and relay compatible. The input to this pin is
referenced to Pin 2, -Input and is protected to +100 VDC.
(3) Case is tied to Pin 1, + Input.
(4) The case thermal impedance is specified as the case temperature rise over ambient per package watt
dissipated.
Rev. 04/2000
NUCLEAR AND MEDICAL APPLICATIONS Power-One products are not 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 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.

2
DFC15 SERIES – DUAL OUTPUT
NOTES
(1) All Parameters measured at Tc=25°C, nominal input voltage and full rated load unless otherwise noted.
Refer to the Technical Reference Section for the definition of terms, measurement circuits and other
information.
(2) Noise is measured per Technical Reference Section. Measurement bandwidth is 0-20 MHz.
(3) An input capacitor must be used for proper operation of the converter. See the DFC15 Series Application
Notes on sizing the input capacitor.
(4) Load regulation for the outputs is specified as the voltage change when both outputs are changed from
maximum to minimum at the same time.
(5) Cross regulation is defined as the change in one output when the other output is changed from full load
to 25% of full load. The converter can be run at no load on either or both outputs with no damage.
(6) Short term stability is specified after a 60 minute warmup at full load, constant line and recording the
drift over a 24 hour period.
(7) The input ripple rejection is specified for DC to 120 Hz ripple with a modulation amplitude of 1% of Vin.
DFC15 SERIES APPLICATION NOTES:
External Capacitance Requirements
An external capacitance is required for operation of the DFC15
Series. For maximum performance, it is recommended that the
DFC15 Series use a capacitor of sufficient ripple current capacity
connected across the input pins. To meet the reflected ripple
requirements of the converter, an input impedance of less than
0.05 Ohms from DC to 200KHz is required. External output
capacitance is not required for operation, however it is
recommended that 1
F to 10F of tantalum and 0.001 to 0.1F
ceramic capacitance be selected for reduced system noise.
Additional output capacitance may be added for increased
filtering, but should not exceed 400F.
(continued next page)

3
DFC15 SERIES – DUAL OUTPUT
DFC15 SERIES BLOCK DIAGRAM
4
+ OUTPUT
ISOLATION TRANSFORMER
+
6
– OUTPUT
5
CMN
7
TRIM
ISOLATED
FEEDBACK
LOW TC
BANDGAP
REFERENCE
FIVE SIDED SHIELDED COPPER CASE
+
+
–
2
– INPUT
ON/OFF
1
3
+ INPUT
CURRENT
MODE
PWM
THERMAL SHUTDOWN
LC
INPUT
FILTER
50
0
5
10
15
60 70 80 9040
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
POWER OUTPUT
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
90
85
80
75
20 52
56 60 64 684836 40 44
100% FULL LOAD
50% FULL LOAD
24 28 32 72
EFFICIENCY Vs. LINE INPUT VOLTAGE (12V OUTPUT)
LINE INPUT (VOLTS)
EFFICIENCY (%)
1.0
0.8
0.2
0.4
0.6
0.0
20 52
56 60 64 684836 40 44
100% FULL LOAD
50% FULL LOAD
75% FULL LOAD
24 28 32 72
INPUT RIPPLE Vs. LINE INPUT (12V OUTPUT)
LINE INPUT (VOLTS)
REFLECTED RMS RIPPLE (AMPS)
120
100
80
20
40
60
0
0 200
15010050 250 300 350 400
OUTPUT VOLTAGE Vs. OUTPUT LOAD (12V OUTPUT)
OUTPUT LOAD (%)
OUTPUT VOLTAGE (%)
1.2
0.9
0.6
0.3
0.0
032
2416
100% FULL LOAD
50% FULL LOAD
8
40 48
6456 72
INPUT CURRENT Vs. LINE INPUT (12V OUTPUT)
LINE INPUT (VOLTS)
INPUT CURRENT (AMPS)
90
80
70
60
040
3020
LINE =
72VDC
LINE =
48VDC
LINE =
20VDC
10 50 60 70 80 90 100
EFFICIENCY Vs. LOAD (12V OUTPUT)
LOAD (%)
EFFICIENCY (%)
APPLICATION NOTES (cont’d):
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 100K internal
pull-up resistor to a 9 volt source.
Output TRIM
The TRIM pin may be used to adjust the
output +5% to -34% from the nominal
setting. This function allows adjustment for
voltage drops in the system wiring. As well
5.2 volt Figure 1 shows the proper
connections to use this function. A trimpot
value of 10K or a fixed resistor may be
used. If the TRIM function is not required
the pin may be left floating.
Figure 1.
4
+OUT
7
TRIM 10K LOAD
USING TRIMPOT
6
-OUT
4
+OUT
7
TRIM
TRIM
DOWN
TRIM
UP
LOAD
USING FIXED RESISTORS
6
-OUT