DFA20 Single-Output DC-DC Series Data Sheet
Description
The compact 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. The output of the converter is electrically
isolated, thereby allowing the output to be configured as
a positive or negative output voltage.
Features
• RoHS lead solder exemption compliant
• Remote On/Off and trim
• Overcurrent protection and thermal shutdown
• Efficiencies to 83%
• 700V isolation; up to 1544V
on 48V converters
• Power density up to 11 Watts
per cubic inch
• Five-sided, shielded case
General Specifications (1)
Model Selection
Model
DFA20E12S3.3
DFA20E12S5
DFA20E12S12
DFA20E12S15
DFA20E24S3.3
DFA20E24S5
DFA20E24S12
DFA20E24S15
DFA20E48S12
Input
VDC
Max
18
18
18
18
36
36
36
36
72
Output Output
VDC
3.3
5
12
15
3.3
5
12
15
12
mA
4000
4000
1700
1400
4000
4000
1700
1400
1700
Al l Models
ON/OFF Function
ON Logic Level
or Pin Open
OFF Logic Level
or Tie Pin to -Input
Open Circuit Voltage
Input Resistance
Converter Idle Current
ON/OFF Pin Lo w
12V Models
24V and 48V Models
Isolation (2 )
Isolation Voltage
Input to Output 12V, 24V
Input to Output 48V
10μA Leakage
Input-to-Output Capacitance
Output Trim Function
Tr im Range
Input Resistance
Open Circuit Voltage
En vi ronmental
Case Operating Range, Tc
No Derating
Case Functional Range (3)
Storage Range
MIN
MAX
T YP
TYP
> 1.6
< 0.7
2. 5
20
Unit s
VD C
VD C
VDC
kOhms
Min
9
9
9
9
18
18
18
18
36
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
6 PLACES
MIN
MIN
T YP
MIN
MIN
T YP
MIN
MAX
MIN
MAX
MIN
MAX
T YP
700
1544
290
±5
10
2. 5
-40
85
-50
100
-55
105
105
9. 5
VD C
pF
%
kOhms
V DC
˚C
˚C
˚C
˚C
˚C/Watt
4
0.700
(17.78)
0.600
(15.24)
0.400
(10.16)
0.300
(7.62)
0.000
0.100
(2.54)
0.51
(13.0)
5
1
2
6
2.02
(51.31)
3
7
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
T hermal Shutdown
Case Temperature
T hermal Impedance (4)
T YP
General
MT BF (Calculated)
T YP
Unit Weight
TYP
Chassis Mounting Kit 12V, 24V
48V
0.25
(6.35)
0.11
(2.8)
0.000
1.800
(45.72)
0.45
(11.43)
0.000
800,000
Hrs
2.3 / 65
oz / gm
CM2B 1
CM2A 1
Pin
1
2
3
4
5
6
7
Function
+Input
-Input
On/Off
No Pin
+Out
-Out
Trim
NOTES:
(1) All parameters measured at Tc = 25°C, nominal input voltage and full-rated load unless otherwise
noted.
(2) The Case is tied to the -Input, Pin 2.
(3) The functional temperature range is intended to give an additional data point for use in evaluating
this power supply. At the low functional temperature the power supply will function with no side
effects. However, sustained operation at the high functional temperature 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 temperature rise over ambient per package
watt dissipated.
MCD10079 Rev. 1.3, 15-Jun-10
Page 1 of 4
www.power-one.com
DFA20 Single-Output DC-DC Series Data Sheet
Input Parameters
(1)
Model
Voltage Range
Reflected Ripple (2)
Input Current Full Load
No Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
100ms Maximum
Turn-ON Time,
1% Output Error
Model
Voltage Range
Reflected Ripple (2)
Input Current Full Load
No Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
100ms Maximum
Turn-ON Time,
1% Output Error
DFA20E12S3.3
DFA20E12S5
DFA20E12S12
DFA20E12S15
DFA20E24S3.3
DFA20E24S5
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
9
18
350
100
1.46
16
76
2.12
16
79
2.15
16
79
220
24
10
DFA20E24S12
DFA20E24S15
DFA20E48S12
18
36
140
40
2.21
16
79
0.70
10
80
1.01
10
83
Units
VDC
mApp
mArms
A
mA
%
kHz
VDC
ms
Units
VDC
mApp
mArms
MA
A
%
kHz
VDC
ms
45
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
18
36
140
40
10
1.00
85
10
1.02
86
220
45
10
36
72
90
25
8
0.51
84
85
Output Parameters
(1)
Model
Output Voltage
Output Voltage Accuracy
Rated Load Range
Load Regulation
25% Max-Max Load
Line Regulation
Vin = Min-Max VDC
Short Term Stability (3)
Input Ripple Rejection (4)
Noise, 0-20 MHz BW (2)
RMS Noise, 0.01 - 1 MHz
Temperature Coefficient
Short Circuit Protection to
Common for all Outputs
MIN
TYP
MAX
MIN
MAX
TYP
MAX
TYP
MAX
TYP
TYP
TYP
TYP
TYP
MAX
DFA20E12S3.3
DFA20E24S3.3
3.33
3.30
3.33
3.36
0.0
4.0
DFA20E12S5
DFA20E24S5
5
4.95
5.00
5.05
0.0
4.0
1
0.5
1.0
0.01
0.1
< 0.05
> 40
75
15
50
150
Continuous, with Thermal Protection
DFA20E12S12
DFA20E24S12
DFA20E48S12
12
11.90
12.00
12.10
0.0
1.7
DFA20E12S15
DFA20E24S15
15
14.90
15.00
15.10
0.0
1.4
Units
VDC
VDC
A
%
%
%/24Hrs
dB
MVpp
mVrms
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 for peak-to-peak measurements; 10 kHz to 1 MHz for RMS measurements. Output noise is
measured with a 0.01μF ceramic capacitor in parallel with a 1μF, 35V Tantalum capacitor located 1” away from the converter to simulate your
PCB’s standard decoupling. Input reflected ripple is measured into a 10μH source impedance.
(3) Short-term stability is specified after a 30-minute warmup at full load, constant line and recording the drift over a 24-hour period.
(4) The input ripple rejection is specified for DC to 120 Hz ripple with a modulation amplitude of 1% of Vin.
MCD10079 Rev. 1.3, 15-Jun-10
Page 2 of 4
www.power-one.com
DFA20 Single-Output DC-DC Series Data Sheet
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
0.5 Ohms 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 1
μ
F to 10
μ
F of tantalum and 0.001 to
0.1
μ
F ceramic capacitance be selected for reduced
system noise. Additional output capacitance may be
added for increased filtering, but should not exceed
400
μ
F.
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.
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 as the 5.2 volt
outputs for ECL applications. Figure 1 shows the proper
connections to use this function. A trimpot value of 10
kOhms should be used for 3.3 and 5 volt outputs. A
trimpot value of 20 kOhms should be used for 12 and 15
volt outputs. If the TRIM function is not required, the pin
may be left floating.
+OUT
5
TRIM
7
-OUT
6
USING TRIMPOT
10K
LOAD
+OUT
5
TRIM
DOWN
TRIM
7
-OUT
6
USING FIXED RESISTORS
LOAD
TRIM
UP
Figure 1
.
DFA20 SERIES BLOCK DIAGRAM
OUTPUT POWER DERATING
20
ISOLATION TRANSFORMER
THERMAL SHUTDOWN
5
+
+ OUTPUT
15
POWER OUTPUT
+ INPUT
1
Ð INPUT
2
LC
INPUT
FILTER
CURRENT
MODE
PWM
6
- OUT
10
+
ON/OFF
7
TRIM
3
ISOLATED
FEEDBACK
Ð
5
FIVE SIDED SHIELDED COPPER CASE
LOW TC
BANDGAP
REFERENCE
0
50
60
70
80
90
AMBIENT TEMPERATURE
100
MCD10079 Rev. 1.3, 15-Jun-10
Page 3 of 4
www.power-one.com
DFA20 Single-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
4
EFFICIENCY (%)
EFFICIENCY (%)
80
LINE = 12VDC
75
LINE = 18VDC
80
100% FULL LOAD
75
INPUT CURRENT (AMPS)
50% FULL LOAD
3
100% LOAD
2
50% LOAD
1
70
70
65
65
0
10
20
30
40
50
60
70
80
90 100
9
10
11
12
13
14
15
16
17
18
0
0
2
4
6
8
10
12
14
16
18
LOAD (%)
24 VOLT EFFICIENCY Vs. LOAD
90
85
LINE = 18VDC
LINE INPUT (VOLTS)
24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
LINE INPUT (VOLTS)
24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
2.0
INPUT CURRENT (AMPS)
100% FULL LOAD
EFFICIENCY (%)
EFFICIENCY (%)
85
50% FULL LOAD
80
1.5
100% LOAD
1.0
50% LOAD
0.5
80
75
70
LINE = 24VDC
75
LINE = 36VDC
70
18
65
0.0
20
22
24
26
28
30
32
34
36
0
5
10
15
2 0
2 5
30
35
40
0
10
20
30
40
50
60
70
80
90 100
LOAD (%)
48 VOLT EFFICIENCY Vs. LOAD
90
85
LINE INPUT (VOLTS)
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
85
LINE INPUT (VOLTS)
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
1.0
INPUT CURRENT (AMPS)
100% FULL LOAD
0.8
100% LOAD
0.6
0.4
0.2
0.0
EFFICIENCY (%)
80
75
70
65
LINE = 36VDC
EFFICIENCY (%)
80
75
50% FULL LOAD
70
65
60
36
50% LOAD
LINE = 48VDC
LINE = 72VDC
60
0
10
20
30
40
50
60
70
80
90 100
40
44
48
52
56
60
64
68
72
0
10
20
30
4 0
50
60
70
80
LOAD (%)
OUTPUT VOLTAGE Vs. OUTPUT LOAD
120
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.
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%.
NORMALIZED OUTPUT (%)
100
80
CURRENT LIMIT MODE >
60
40
20
0
0
20
40
60
80
100
120
140
2)
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.
MCD10079 Rev. 1.3, 15-Jun-10
Page 4 of 4
www.power-one.com
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