®
DFA6 SERIES
SINGLE OUTPUT
DESCRIPTION
The DFA6 Series provides quick power conversion solutions to
analog and digital systems. Requires few external components.
The converters provide plug-and-play versatility. The series fea-
tures an input range of 3:1. The output is electrically isolated,
thereby allowing the output to be configured for positive or nega-
tive output voltage. The DFA6 provides compact system power in
less than 2.3 square inches (14.8 cm
2
).
The DFA6 Series’ ultra-wide input and no load input current
(7mA) makes it well suited for battery operation in commercial
and industrial applications. Full overload protection is provided
by pulse-by-pulse current limiting.
Selection Chart
Model
DFA6U12S5
DFA6U12S12
DFA6U12S15
DFA6U48S5
DFA6U48S12
DFA6U48S15
Input Range
VDC (4)
Min
9
9
9
20
20
20
Max
27
27
27
60
60
60
Output
VDC
5
12
15
5
12
15
Output
mA
1000
500
400
1000
500
400
0.300
(7.62)
0.000
0.200
(5.08)
0.500
(12.70)
0.64
(16.3)
0.000
0.66
(16.8)
1
2
4
FEATURES
•
Up to 6 Watts Output Power
•
Overcurrent Protection
•
Efficiency to 83%
•
Low Input to Output Capacitance
•
700V Isolation, Input to Output
•
Ultra-Wide Input Range (3:1)
BOTTOM VIEW
2.12
(53.85)
3
1.08
(27.43)
SIDE VIEW
0.040 (1.02) DIA
4 PLACES
0.800
(20.32)
General Specifications
(1)
All Models
Isolation
Isolation Voltage
Input to Output
10
µ
A Leakage
Input to Output
Capacitance
Environmental
Case Operating Range, Tc
No Derating
Storage Range
Thermal Impedance (2)
General
MTBF (Calculated)
Unit Weight
Chassis Mounting Kits
TYP
TYP
800,000
1.0 / 28
CM2A1
HRS
oz / gm
MIN
TYP
MIN
MAX
MIN
MAX
TYP
700
400
-40
85
-55
105
20
VDC
pF
Units
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.040 inches
X.XXX dimensions: ±0.010 inches
°C
°C
°
C/Watt
Pin
1
2
3
4
Function
+INPUT
-INPUT
+OUT
-OUT
For the Most Up-To-Date Information
NOTES
(1)
All parameters measured at Tc=25°C, 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.
The case Thermal Impedance is specified as the case temperature rise over ambient per package dis-
sipated
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24 Hours/Day—7 Days/Week
(2)
1
0.48
(12.19)
0.3
(7.62)
0.000
®
DFA6 SERIES – SINGLE OUTPUT
Input Parameters
(1)
Model
Voltage Range
Reflected Ripple (2)
Input Current
Full Load
No Load
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
DFA6U12S5
DFA6U12S12
9
27
1.8
0.93
507
6
82
600
12
83
125
130
5
80
DFA6U12S15
DFA6U48S5
DFA6U48S12
20
60
0.85
0.44
154
6
82
DFA6U48S15
Units
VDC
A
PP
A
rms
mA
%
kHz
Efficiency
Switching Frequency
Maximum Input
Overvoltage
100ms Maximum
12V Models
48V Models
Turn-on Time,
1% Output Error
MAX
34
72
6
VDC
TYP
ms
Output Parameters
(1)
Model
Output Voltage
Output Voltage Accuracy
Rated Load Range
Load Regulation
25% - 100% of
Rated Load
Line Regulation
Vin = Min to Max VDC
Short Term Stability (3)
Input Ripple Rejection (4)
Noise, Peak - Peak (2)
RMS Noise
Temperature Coefficient
Short Circuit Protection
+OUT to -OUT
NOTES
(1)
All parameters measured at Tc=25°C, 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.
Noise is measured per Technical Reference Section. 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
/ 35V Tantalum capacitor, 1 inch from the output pins to simulate standard PCB decoupling capaci-
tance. Reflected Ripple is measured with the appropriate input capacitor, and into a 10 µH source
impedance. See application notes for input capacitor requirements.
Short term stability is specified after a 30 minute warmup at full load, constant line and recording
the drift over a 24 hour period.
The input ripple rejection is specified for DC to 120 Hz ripple with a modulation amplitude of 1%
of Vin.
DFA6U12S5
MIN
TYP
MAX
MIN
MAX
TYP
MAX
TYP
MAX
TYP
TYP
TYP
TYP
TYP
MAX
DFA6U48S5
5
4.95
5.00
5.05
0.0
1.0
0.1
0.3
0.02
0.2
DFA6U12S12
DFA6U48S12
DFA6U12S15
DFA6U48S15
Units
VDC
VDC
A
%
%
%/24Hrs
dB
mV
PP
mV
rms
ppm/
°C
12
11.90
12.00
12.10
0.0
0.5
0.2
0.4
0.2
0.8
< 0.05
> 40
50
8
50
150
Continuous, Current Limit Protection
15
14.90
15.00
15.10
0.0
0.4
0.2
0.4
0.2
0.8
DFA6 SERIES APPLICATION NOTES:
External Capacitance Requirements
No external capacitance is required for operation of the DFC6 Series.
To meet the reflected ripple requirements of the converter, an input
impedance of less than 0.35 Ohms from DC to 250KHz is required.
If a capacitive input source is farther than 1” from the converter, an
additional capacitor may be required at the input pins for proper oper-
ation. 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.
(2)
(3)
(4)
2
®
DFA6 SERIES – SINGLE OUTPUT
DFA6 SERIES BLOCK DIAGRAM
ISOLATION TRANSFORMER
OUTPUT POWER DERATING
6
3
+
+ OUTPUT
+ INPUT
1
– INPUT
2
CURRENT
MODE
PWM
4
- OUT
POWER OUTPUT
5
4
+
–
ISO AMP
3
2
LOW TC
BANDGAP
REFERENCE
50
60
70
80
90
AMBIENT TEMPERATURE
100
Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load)
Data for 12 Volt Input Models
12 VOLT EFFICIENCY Vs. LOAD
85
LINE = 9VDC
LINE = 12VDC
80
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
1.00
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
85
100% LOAD
INPUT CURRENT (AMPS)
EFFICIENCY (%)
100% LOAD
EFFICIENCY (%)
75
70
65
60
55
50
45
0
10
20
30
0.75
80
0.50
50% LOAD
0.25
LINE = 27VDC
50% LOAD
75
0.00
40
50
60
70
80
90 100
0
5
10
15
20
25
30
70
5
10
15
20
25
30
LOAD (%)
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
Data for 48 Volt Input Models
48 VOLT EFFICIENCY Vs. LOAD
90
85
80
LINE = 20VDC
LINE = 48VDC
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
0.5
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
85
INPUT CURRENT (AMPS)
A
100% LOAD
0.4
100% LOAD
0.3
0.2
50% LOAD
0.1
0.0
EFFICIENCY (%)
75
70
65
60
55
50
45
40
0
10
20
30
40
50
60
70
80
90 100
LINE = 60VDC
EFFICIENCY (%)
80
50% LOAD
75
70
65
20
0
10
20
30
40
50
60
30
40
50
60
LOAD (%)
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
3
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