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DFA20E24S12

P1-P3P4-P4
DFA20 Single-Output DC-DC Series Data Sheet
MCD10079 Rev. 1.3, 15-Jun-10 Page 1 of 4 www.power-one.com
• 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
Features
The compact DFA20 Series provides power densities up
to 11 watts per cubic inch (0.67 watts per cm
3
). 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.
Description
1
BOTTOM VIEW SIDE VIEW
0.000
0.000
0.25
0.000
2.02
(51.31)
(6.35)
0.040 (1.02) DIA
6 PLACES
0.45
2.02
(11.43)
(51.31)
2
3
7
6
5
4
1.800
0.11
0.700
0.300
0.100
0.600
0.400
0.51
(7.62)
(2.54)
(13.0)
(17.78)
(15.24)
(10.16)
(45.72)
(2.8)
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.
Min
Max
Model Selection
Model
VDC
mA
DFA20E12S3.3
9 18 3.3 4000
DFA20E12S5
9 18 5 4000
DFA20E12S12
9 18 12 1700
DFA20E12S15
9 18 15 1400
DFA20E24S3.3
18 36 3.3 4000
DFA20E24S5
18 36 5 4000
DFA20E24S12
18 36 12 1700
DFA20E24S15
18 36 15 1400
DFA20E48S12
36 72 12 1700
Output Output
Input
VDC
General Specifications (1)
Al l Models Unit s
ON/OFF Function
ON Logic Level
or Pin Open
MIN > 1.6 VD C
OFF Logic Level
or Ti e Pin to -Input
MAX < 0.7 VD C
Open Circuit Voltage T YP 2. 5 VDC
Input Resistance TYP 20 kOhms
Converter Idle
Current
ON/OFF Pin Lo w
12V Models
24V and 48V Models
TYP
TYP
3
5
mA
mA
Isolation (2 )
Isolation Voltage
Input to Output 12V, 24V
Input to Output 48V
10μA Leakage
MIN
MIN
700
1544
VD C
Input-to-Output Capacitance T YP 290 pF
Output Trim Function
Tr im Range MIN ±5 %
Input Resistance MIN 10 kOhms
Open Circuit Voltage T YP 2. 5 V DC
En vi ronmental
Case Operating Range, Tc
No Derating
MIN
MAX
-40
85
˚C
Case Functional Range (3)
MIN
MAX
-50
100
˚C
Storage Range
MIN
MAX
-55
105
˚C
T hermal Shutdown
Case
Temperature
T YP 105
˚C
T hermal Impedance (4) T YP 9. 5
˚C/Watt
General
MT BF (Calculated) T YP 800,000 Hrs
Unit Weight TYP 2.3 / 65 oz / gm
Chassis Mount
ing Kit 12V, 24V
CM2B 1
48V CM2A 1
Pin Function
1 +Input
2 -Input
3 On/Off
4 No Pin
5 +Out
6 -Out
7 Trim
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
Model numbers highlighted in yellow or shaded are not
recommended for new designs.
DFA20 Single-Output DC-DC Series Data Sheet
MCD10079 Rev. 1.3, 15-Jun-10 Page 2 of 4 www.power-one.com
Input Parameters (1)
Model
DFA20E12S3.
3
DFA20E12S5 DFA20E12S12
DFA20E12S15
DFA20E24S3.3
DFA20E24S5
Units
Voltage Range MIN
MAX
9
18
18
36
VDC
TYP
350
140 mApp Reflected Ripple (2)
TYP 100 40 mArms
Input Current Full Load
No Load
TYP
TYP
1.46
16
2.12
16
2.15
16
2.21
16
0.70
10
1.01
10
A
mA
Efficiency TYP 76 79 80
79
79 83 %
Switching Frequency TYP 220 kHz
Maximum Input
Overvoltage,
100ms Maximum
MAX
24
45
VDC
Turn-ON Time,
1% Output Error
TYP
10
ms
Model
DFA20E24S12
DFA20E24S15
DFA20E48S12
Units
Voltage Range MIN
MAX
18
36
36
72
VDC
TYP
140
90 mApp Reflected Ripple (2)
TYP
40
25 mArms
Input Current Full Load
No
Load
TYP
TYP
10
1.00
10
1.02
8
0.51
MA
A
Efficiency
TY
P 85 86 84 %
Switching Frequency TYP 220 kHz
Maximum Input
Overvoltage,
100ms Maximum
MAX
45
85
VDC
Turn-ON Time,
1% Output Error
TYP
10
ms
Output Parameters (1)
Model
DFA20E12S3.3
DFA20E24S3.3
DFA20E12S5
DFA20E24S5
DFA20E12S12
DFA20E24S12
DFA20E48S12
DFA20E12S15
DFA20E24S15
Units
Output Voltage 3.33 5 12 15 VDC
Output Voltage Accuracy
MIN
TYP
MAX
3.30
3.33
3.36
4.95
5.00
5.05
11.90
12.00
12.10
14.90
15.00
15.10
VDC
Rated Load Range MIN
MAX
0.0
4.0
0.0
4.0
0.0
1.7
0.0
1.4
A
Load Regulation
25% Max-Max Load
TYP
MAX
1
%
Line Regulation
Vin = Min-Max VDC
TYP
MAX
0.5
1.0
0.01
0.1
%
Short Term Stability (3) TYP < 0.05 %/24Hrs
Input Ripple Rejection (4) TYP > 40 dB
Noise, 0-20 MHz BW (2) TYP 75 MVpp
RMS Noise, 0.01 - 1 MHz TYP 15 mVrms
Temperature Coefficient TYP
MAX
50
150
ppm/°C
Short Circuit Protection to
Common for all Outputs
Continuous, with Thermal Protection
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.
DFA20 Single-Output DC-DC Series Data Sheet
MCD10079 Rev. 1.3, 15-Jun-10 Page 3 of 4 www.power-one.com
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 1μF to 10
μF of tantalum and 0.001 to
0.1
μF ceramic capacitance be selected for reduced
system noise. Additional output capacitance may be
added for increased filtering, but should not exceed
400μF.
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.
5
+OUT
7
TRIM 10K LOAD
USING TRIMPOT
6
-OUT
5
+OUT
7
TRIM
TRIM
DOWN
TRIM
UP
LOAD
USING FIXED RESISTORS
6
-OUT
Figure 1
.
DFA20 SERIES BLOCK DIAGRAM
5
+ OUTPUT
ISOLATION TRANSFORMER
+
6
7
TRIM
ISOLATED
FEEDBACK
LOW TC
BANDGAP
REFERENCE
FIVE SIDED SHIELDED COPPER CASE
+
Ð
2
Ð INPUT
ON/OFF
1
3
+ INPUT
CURRENT
MODE
PWM
THERMAL SHUTDOWN
LC
INPUT
FILTER
- OUT
50
0
5
10
15
20
60 70 80 90 100
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
POWER OUTPUT
P1-P3P4-P4

DFA20E24S12

Mfr. #:
Buy DFA20E24S12
Manufacturer:
Bel
Description:
DC DC CONVERTER 12V 20W
Lifecycle:
New from this manufacturer.
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