1
DESCRIPTION
The DFC15 Series of DC/DC converters are designed to provide a
wide range of PCB power solutions. The converter features 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.
FEATURES
Up to 15 Watts Output Power
Efficiencies to 83%
Very Low OFF Current
700V Isolation
Dual Stage Output filter
-40C to +90C Operation
Ultra-Wide Range Input (3:1)
Remote ON/OFF and TRIM
DFC15 SERIES
SINGLE OUTPUT
Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.005 inches
1
BOTTOM VIEW
SIDE VIEW
0.000
0.000
0.3
0.000
2.02
(51.31)
(7.62)
0.040 (1.02) DIA
6 PLACES
0.55
1.62
(13.97)
(41.15)
2
3
7
6
5
1.800
0.11
0.700
0.400
0.100
0.600
0.300
0.31
(10.16)
(2.54)
(7.62)
(7.9)
(17.78)
(15.24)
(2.8)
(45.72)
NOTES
(1)
All parameters measured at Tc = 25C, 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 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.
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www.power-one.com
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For the Most Up-To-Date Information
24 Hours/Day--7 Days/Week
Rev. 04/2000
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NOTES
(1)
All Parameters measured at Tc=25C, 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. RMS
noise is measured over a 0.01-1 MHz bandwidth. To simulate standard PCB decoupling practices,
output noise is measured with a 1F/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 warm-up at full load, and with constant line, load
and ambient conditions.
(5)
The input ripple rejection is specified for DC to 120Hz ripple with a modulation amplitude of 1% Vin.
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 200KHz is required. External output
capacitance is not required for operation, however it is
recommended that 1 F to 10 F of tantalum and 0.001 to 0.1 F
ceramic capacitance be selected for reduced system noise.
Additional output capacitance may be added for increased
filtering, but should not exceed 400 F.
Negative Outputs
A negative output voltage may be obtained by connecting the
+OUT to circuit ground and connecting -OUT as the negative
output.
(continued)
DFC15 SERIES SINGLE OUTPUT
3
5
+OUT
7
TRIM
10K
LOAD
USING TRIMPOT
6
-OUT
5
+OUT
7
TRIM
TRIM
DOWN
TRIM
UP
LOAD
USING FIXED RESISTORS
6
-OUT
DFC15 SERIES BLOCK DIAGRAM
5
+ OUTPUT
SHIELDED ISOLATION TRANSFORMER
+
6
- OUTPUT
7
TRIM
ISOLATED
FEEDBACK
LOW TC
BANDGAP
REFERENCE
FIVE SIDED SHIELDED COPPER CASE
+
2
INPUT
ON/OFF
1
3
+ INPUT
CURRENT
MODE
PWM
+
1.2
1.0
0.6
0.8
0.4
0.2
0.0
0
30
20
100% LOAD
50% LOAD
10
40
50
60
INPUT CURRENT Vs. INPUT VOLTAGE
LINE INPUT (VOLTS)
INPUT CURRENT (AMPS)
90
85
80
LINE = 20VDC
LINE = 48VDC
LINE = 60VDC
65
75
70
60
0
20
40
60
80
90
10
30
50
70
100
EFFICIENCY Vs. LOAD
LOAD (%)
EFFICIENCY (%)
1.00
0.80
100% FULL LOAD
75% FULL LOAD
50% FULL LOAD
0.60
0.40
0.20
20
40
45
60
25
30
35
50
55
INPUT RIPPLE Vs. LINE INPUT
LINE INPUT (VOLTS)
REFLECTED RMS RIPPLE (AMPS)
85
82
80
77
75
20
45
50
55
40
35
100% FULL LOAD
50% FULL LOAD
25
30
60
EFFICIENCY Vs. LINE INPUT VOLTAGE
LINE INPUT (VOLTS)
EFFICIENCY (%)
Typical Performance: (Tc=25C, Vin=Nom VDC, Rated Load)
120
100
60
80
40
20
0
0
80
20
40
100 120
140 160
180
60
OUTPUT VOLTAGE Vs. OUTPUT LOAD
OUTPUT LOAD (%)
OUTPUT VOLTAGE (%)
50
0
5
10
15
60
70
80
90
40
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
POWER OUTPUT
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% 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 10K should be used for 5 volt
outputs. A trimpot value of 20K should be
used for 12 and 15 volt outputs. If the TRIM
function is not required the pin may be left
floating.
Figure 1.
DFC15 SERIES SINGLE OUTPUT
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.
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