DFC15 Dual-Output DC-DC Series Data Sheet
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
• RoHS lead solder exemption compliant
• Remote on/off and trim
• Overcurrent and overtemperature protected
• Water-washable case
• Efficiencies to 82%
• 1544 V isolation
• Ultra-wide range input (>3:1)
Model Selection
Model
DFC15U48D12
DFC15U48D15
Input Range
VD C
Min
20
20
Ma x
72
72
Output
VD C
±12
±1 5
Output
mA
62 5
50 0
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
BOTTOM VIEW
2.02
(51.31)
4
SIDE VIEW
0.040 (1.02) DIA
7 PLACES
5
1
2
6
1.62
(41.15)
Model numbers highlighted in yellow or shaded are not recommended for
new designs.
3
7
General Specifications (1)
All Models
ON/OFF Function (2)
O N L og i c L ev e l
or Leave Pin Floating
Off Logic Level
Input Resistance
Converter Idle Current
ON/OFF Pin Low
Isolation (3)
Breakdown Voltage
10
µ
A Leakage
Input to Output
Input to Output
Capacitance
Output Trim Function
Input Resistance
Programming Range
Environmental
Case Functional Range, Tc
No Derating
Storage Range
Thermal Impedance (4)
Thermal Shutdown
Case Temperature
General
MTBF (Calculated)
Unit Weight
Chassis Mounting Kit
Units
0.3
(7.62)
1.800
(45.72)
MIN
MAX
T YP
T YP
8.0
2.0
100
2
VDC
VDC
Ko h m s
mA
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.010 inches
X.XXX dimensions: ±0.005 inches
MIN
T YP
1544
450
VDC
pF
T YP
MI N
MIN
M AX
MIN
MAX
TYP
TY P
40
+5, -34
-40
1 00
- 55
1 05
10
1 05
Ko h m s
%
Pi n
1
2
3
4
5
6
7
Function
+INPUT
-I N P U T
ON/OFF
+OUTPUT
COMMON
-OUTPUT
TRIM
¡C
¡C
¡ C/Watt
¡C
Notes
(1) All parameters measured at Tc = 25 °C, nominal input voltage and
full rated load unless otherwise noted.
(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.
TYP
T YP
800,000
2.3/65
CM2B2
H RS
oz/gm
REV. JAN 20, 2006
Page 1 of 4
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0.55
(13.97)
0.000
DFC15 Dual-Output DC-DC Series Data Sheet
Input Parameters
(1)
Model
Voltage Range
Reflected Ripple (2) (3)
Input Current
Efficiency
Switching Frequency
Maximum Input Overvoltage 100ms
Turn-on Time, 1% Output Error
MIN
TYP
MA X
TYP
T YP
T YP
TYP
TYP
MAX
TYP
DFC15U48D12
20.0
48.0
72.0
660
3 84
5
81
120
85
20
38 1
5
82
DFC15U48D15
Units
VDC
mA
PP
mA
%
kH z
VDC
ms
Full Load
No Load
Output Parameters
(1)
Model
Output Voltage
Rated Load Range
Voltage Range
Load Regulation (4)
0% -100% Full Load
Cross Regulation (5)
25%-100% Load
Line Regulation
Vin = Min-Max VDC
Short Term Stability (6)
Long Term Stability
Input Ripple Rejection (7)
Noise, 0-20MHz bw (2)
with 0.1
µ
F External Capacitor
with no External Capacitor
Temperature Coefficient
Overvoltage Clamp
Short Circuit Protection to
Common for all Outputs
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.
(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.
MIN
M AX
M IN
T YP
MAX
TYP
MAX
TYP
TYP
MAX
TYP
TYP
TYP
T YP
T YP
TYP
MAX
TYP
DFC15U48D12
±
12
0
625
11.900
12.000
12.100
0.15
0.4
3.0
0.04
0.2
< 0.02
< 0.2
>60
30
70
50
150
18
Continuous protection with current limiting and thermal
overload techniques
DFC15U48D15
±
15
0
50 0
14.900
15.000
15.100
Units
VD C
mA
VD C
%
%
%
%/24Hrs
%/kHrs
dB
mV
PP
mV
PP
ppm/
°C
VDC
REV. JAN 20, 2006
Page 2 of 4
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DFC15 Dual-Output DC-DC Series Data Sheet
DFC15 SERIES BLOCK DIAGRAM
ISOLATION TRANSFORMER
OUTPUT POWER DERATING
15
THERMAL SHUTDOWN
+
+
+ INPUT
4
5
6
+ OUTPUT
CMN
POWER OUTPUT
10
1
LC
INPUT
FILTER
CURRENT
MODE
PWM
– OUTPUT
– INPUT
2
+
7
TRIM
5
ON/OFF
3
ISOLATED
FEEDBACK
–
FIVE SIDED SHIELDED COPPER CASE
LOW TC
BANDGAP
REFERENCE
0
40
50
60
70
80
AMBIENT TEMPERATURE
90
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 200 kHz 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.
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 100KV
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 10KV or a fixed resistor may be used. If the TRIM function is not required the pin may be left floating.
REV. JAN 20, 2006
Page 3 of 4
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DFC15 Dual-Output DC-DC Series Data Sheet
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
EFFICIENCY Vs. LINE INPUT VOLTAGE (12V OUTPUT)
REFLECTED RMS RIPPLE (AMPS)
90
1.0
100% FULL LOAD
0.8
0.6
0.4
50% FULL LOAD
0.2
0.0
20 24 28 32 36 40 44 48 52 56 60 64 68 72
INPUT RIPPLE Vs. LINE INPUT (12V OUTPUT)
EFFICIENCY (%)
50% FULL LOAD
85
75% FULL LOAD
80
100% FULL LOAD
75
20 24 28 32 36 40 44 48 52 56 60 64 68 72
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
INPUT CURRENT Vs. LINE INPUT (12V OUTPUT)
1.2
OUTPUT VOLTAGE Vs. OUTPUT LOAD (12V OUTPUT)
120
INPUT CURRENT (AMPS)
0.9
100% FULL LOAD
0.6
OUTPUT VOLTAGE (%)
56
64
72
100
80
60
40
20
0
0.3
50% FULL LOAD
0.0
0
8
16
24
32
40
48
0
50
100
150
200
250
300
350
400
LINE INPUT (VOLTS)
OUTPUT LOAD (%)
EFFICIENCY Vs. LOAD (12V OUTPUT)
+OUT
4
TRIM
7
-OUT
6
USING TRIMPOT
10K
LOAD
+OUT
4
TRIM
DOWN
TRIM
UP
-OUT
6
USING FIXED RESISTORS
EFFICIENCY (%)
90
LINE =
20VDC
TRIM
7
LOAD
80
LINE =
48VDC
70
LINE =
72VDC
60
0
10
20
30
40
50
60
70
80
90 100
Figure 1.
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.
REV. JAN 20, 2006
Page 4 of 4
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