DFA20 Dual-Output DC-DC Series Data Sheet
Description
The compact, dual output DFA20 Series provides
power densities up to 11 watts per cubic inch (0.67
watts per cm3). Ideal for battery-operated industrial,
medical control, and remote data collection systems,
this converter has fully-filtered inputs and outputs.
Complete overload protection with independent pulse-
by-pulse current limiting and an overtemperature
shutdown ensures reliable system operation.
Converters with 48 volt inputs are isolated to 1544
volts.
Model Selection
Model
DFA20E12D5
DFA20E12D12
DFA20E12D15
DFA20E24D5
DFA20E24D12
DFA20E24D15
DFA20E48D5
DFA20E48D12
DFA20E48D15
Input Range (VDC)
Min Max
9
18
9
9
18
18
18
36
36
36
18
18
36
36
36
72
72
72
Output
(VDC)
±5
±12
±15
±5
±12
±15
±5
±12
±15
Output
(mA)
1700
850
700
1700
850
700
1700
850
700
Features
• RoHS lead solder exemption compliant
• Remote on/off and trim
• Water-washable case
• Overcurrent protection and thermal shutdown
• Efficiencies to 85%
• Low input-to-output capacitance
• 700V to 1544V isolation
• Five-sided shielded case
General Specifications (1)
All Models
ON/OFF Function
ON Logic Level
or Leave Pin Open
OFF Logic Level
or Tie Pin to -Input
Open Circuit Voltage
Input Resistance
Converter Idle Current
ON/OFF Pin Low
12V Models
4V and 48V Models
Isolation (2)
Breakdown Voltage
Input to Output 12V , 24V
Input to Output 48V
10
μ
A Leakage
Input to Output
Capacitance
Output Trim Function
Trim Range
Input Resistance
2.02
(51.31)
Units
MIN
MAX
TYP
TYP
>1.6
<0.7
2.5
20
VDC
VDC
VDC
Kohms
TYP
TYP
3
5
mA
mA
Model numbers highlighted in yellow or shaded are not
recommended for new designs.
BOTTOM VIEW
2.02
(51.31)
SIDE VIEW
0.040 (1.02) DIA
7 PLACES
MIN
MIN
TYP
700
1544
5 00
VDC
pF
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)
0.510
(13.0)
4
MIN
MIN
MIN
MAX
MIN
MAX
MIN
MAX
TYP
TYP
TYP
TYP
±5
60
- 40
90
-50
1 00
- 55
105
1 05
9.5
800,000
2.3/65
CM2B2
CM2A2
%
Kohms
5
1
2
6
3
Environmental
Case Functional Range, Tc
No Derating
Case Functional Range (3)
Storage Range
Thermal Shutdown
Case Temperature
Thermal Impedance (4)
General
MTBF (Calculated)
Unit Weight
Chassis Mounting Kit 12V, 24V
Chassis Mounting Kit 48V
0.25
(6.35)
¡C
¡C
¡C
¡C
¡ C/Watt
HRS
oz/gm
7
0.11
(2.8)
0.000
1.800
(45.72)
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
Pin
1
2
3
4
5
6
7
Function
+INPUT
-INPUT
ON/OFF
+OUTPUT
COMMON
-OUTPUT
TRIM
NOTES
(1) All parameters measured at Tc = 25°C, nominal input voltage and full rated load unless otherwise noted.
(2) Case is electrically connected to Pin 2, -Input.
(3) The functional case operating range is intended to give an additional data point for evaluating this converter. Sustained operation at the higher
operating range will reduce expected operational life. The data Sheet specifications are not guaranteed beyond the case operating range.
(4) The case thermal impedance is specified as the case temper-ature rise over ambient per package watt dissipated.
0.45
(11.43)
0.000
MCD10174 Rev. 1.0, 15-Jun-10
Page 1 of 4
www.power-one.com
DFA20 Dual-Output DC-DC Series Data Sheet
Input Parameters
(1)
Model
Voltage Range
Reflected Ripple (2)
Input Current No Load
Full Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
100 ms maximum
Turn-on Time,
1% Output Error
Model
Voltage Range
Reflected Ripple (2)
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
DFA20E48D5
MIN
MAX
TY P
TYP
Input Current No Load
Full Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
100 ms maximum
Turn-on Time,
1% Output Error
TYP
TYP
TYP
TY P
MAX
TYP
12
440
81
24
6
DFA20E48D12
36.0
72.0
90
25
12
505
84
220
85
10
12
520
84
DFA20E48D15
12
1750
81
DFA20E12D5
DFA20E12D12
9.0
18.0
35 0
100
12
2 17 0
78
12
2210
79
220
45
12
875
81
DFA20E12D15
DFA20E24D5
DFA20E24D12
18.0
36.0
140
40
12
1010
84
12
1 03 0
85
DFA20E48D15
Units
V DC
m A
PP
mA
rms
mA
%
kHz
V DC
ms
Units
V DC
mA
PP
mA
rms
mA
%
kHz
VDC
ms
Output Parameters
(1)
Model
Output Voltage
Output Voltage Accuracy
Output Balance
Plus to Minus Output, Full Load
Rated Load Range
Load Regulation (3)
Cross Regulation (4)
Line Regulation
Vin = Min-Max VDC
Short Term Stability (5)
Long Term Stability
Input Ripple Rejection (6)
Noise, 0-20MHz bw (2)
RMS Noise, 0.01-1 MHz bw
Temperature Coefficient
Short Circuit Protection to
Common for all Outputs
MIN
TY P
MAX
TY P
MAX
MIN
MAX
TYP
MAX
TYP
TYP
MAX
TYP
TYP
TYP
TYP
TYP
TY P
MAX
50
15
DFA20E12D5
DFA20E24D5
DFA20E48D5
±5
4.95
5.00
5.05
DFA20E12D12
DFA20E24D12
DFA20E48D12
±
12
11.90
12.00
12.10
< 0.5
1.0
0.0
0.85
0.1
0.6
3
< 0.2
0.8
< 0.05
< 0.2
> 40
50
10
50
150
50
10
DFA20E12D15
DFA20E24D15
DFA20E48D15
±
15
14.90
15.00
15.10
Units
VDC
VDC
%
0.0
0.7
0.2
0.6
3
< 0.2
0.8
A
%
%
%
%/24Hrs
%/kHrs
dB
mV
PP
mV
rms
ppm/
°C
0.0
1.7
0.3
0.7
3
< 0.1
0.8
Continuous, Current Limit and Thermal Protection
Specification notes for this page are located on the next page.
MCD10174 Rev. 1.0, 15-Jun-10
Page 2 of 4
www.power-one.com
DFA20 Dual-Output DC-DC Series Data Sheet
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 for peak-peak
measurements, 10 kHz to 1 MHz for RMS measurements. Output
noise is measured with a 1μF tantalum located 1" away from the
converter to simulate PCB standard decoupling. Input reflected
ripple is measured into a 1
μH
source impedance.
(3) Load regulation for the outputs is specified as the voltage change
when both outputs are changed from maximum to minimum at the
same time.
(4) 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.
(5) Short term stability is specified after a 30-minute warmup at full
load, constant line and recording the drift over a 24-hour period.
(6) The input ripple rejection is specified for DC to 120 Hz ripple with
a modulation amplitude of 1% of Vin.
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 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.
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. Figure 1 shows the
proper connections to use this function. If the TRIM
function is not required, the pin may be left floating.
DFA20 SERIES APPLICATION NOTES:
External Capacitance Requirements
No external capacitance is required for operation of the
DFA20 Series. The use of input capacitors with less than
0.5V ESR may cause peaking in the input filter and
degrade filter performance. 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 reduced system noise.
+OUT
4
TRIM
7
-OUT
6
USING TRIMPOT
10K
LOAD
+OUT
4
TRIM
DOWN
TRIM
7
-OUT
6
USING FIXED RESISTORS
LOAD
TRIM
UP
Figure 1.
DFA20 SERIES BLOCK DIAGRAM
OUTPUT POWER DERATING
20
SHIELDED ISOLATION TRANSFORMER
THERMAL LIMIT
+
+
+ INPUT
4
5
6
+ OUTPUT
15
POWER OUTPUT
CMN
1
– INPUT
2
LOW
NOISE
FILTER
CURRENT
MODE
PWM
– OUTPUT
10
+
ON/OFF
7
TRIM
3
–
5
SHIELDED COPPER CASE
0
50
60
70
80
90
AMBIENT TEMPERATURE
100
MCD10174 Rev. 1.0, 15-Jun-10
Page 3 of 4
www.power-one.com
DFA20 Dual-Output DC-DC Series Data Sheet
Typical Performance: (Tc=25 C, Vin=Nom VDC, Rated Load)
12 VOLT EFFICIENCY Vs. LOAD
85
LINE = 9VDC
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
85
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
3.5
INPUT CURRENT (AMPS)
50% FULL LOAD
3.0
2.5
2.0
1.5
50% LOAD
1.0
0.5
0.0
0
2
4
6
8
10
12
14
16
18
100% LOAD
EFFICIENCY (%)
80
EFFICIENCY (%)
LINE = 12VDC
80
100% FULL LOAD
75
75
LINE = 18VDC
70
0
10
20
30
40
50
60
70
80
90 100
70
9
10
11
12
13
14
15
16
17
18
LOAD (%)
24 VOLT EFFICIENCY Vs. LOAD
90
LINE INPUT (VOLTS)
24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
LINE INPUT (VOLTS)
24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
2.0
EFFICIENCY (%)
LINE = 18VDC
EFFICIENCY (%)
85
INPUT CURRENT (AMPS)
85
100% FULL LOAD
1.5
100% LOAD
80
LINE = 24VDC
75
LINE = 36VDC
0
10
20
30
40
50
60
70
80
90 100
1.0
50% FULL LOAD
80
0.5
50% LOAD
70
75
18
0.0
20
22
24
26
28
30
32
34
36
0
4
8
12
16
20
24
28
32
36
LOAD (%)
48 VOLT EFFICIENCY Vs. LOAD
90
LINE INPUT (VOLTS)
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
100% FULL LOAD
LINE INPUT (VOLTS)
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
1.00
EFFICIENCY (%)
80
LINE = 36VDC
EFFICIENCY (%)
85
INPUT CURRENT (AMPS)
0.75
100% LOAD
80
50% FULL LOAD
75
0.50
75
LINE = 48VDC
0.25
50% LOAD
60
0
LINE = 72VDC
10
20
30
40
50
60
70
80
90 100
70
36
40
44
48
52
56
60
64
68
72
0.00
0
10
20
30
40
50
60
70
80
LOAD (%)
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
NOTES ON USING THE CURVES
1)
The input currents are for 20 watts of output power. For ±5 volt output models
the current is approximately 15% less.
2)
The efficiency curves are for 12 volt output models. To use for other models
adjust as follows:
±5 volt models subtract approximately 3%.
±15volt models add approximately 1%.
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.
MCD10174 Rev. 1.0, 15-Jun-10
Page 4 of 4
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