1
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
features an input range of 3:1. The output is electrically isolated,
thereby allowing the output to be configured for positive or
negative 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.
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)
NOTES
(1)
All parameters measured at Tc=25C, 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.
(2)
The case Thermal Impedance is specified as the case temperature rise over ambient per package
dissipated
Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.040 inches
X.XXX dimensions: 0.010 inches
1
BOTTOM VIEW
SIDE VIEW
0.040 (1.02) DIA
2
3
4
4 PLACES
0.800
0.000
0.66
0.48
0.3
0.000
0.300
0.500
0.000
0.200
2.12
1.08
(7.62)
(5.08)
(12.70)
(16.8)
(20.32)
(7.62)
(12.19)
(53.85)
(27.43)
0.64
(16.3)
DFA6 SERIES
SINGLE OUTPUT
www.power-one.com
www.power-one.com
For the Most Up-To-Date Information
24 Hours/Day--7 Days/Week
Rev. 04/2000
NUCLEAR AND MEDICAL APPLICATIONS Power-One products are not 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 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.
2
DFA6 SERIES SINGLE OUTPUT
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
operation. 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.
NOTES
(1)
All parameters measured at Tc=25C, 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.
(2)
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 1f
/ 35V Tantalum capacitor, 1 inch from the output pins to simulate standard PCB decoupling
capacitance. Reflected Ripple is measured with the appropriate input capacitor, and into a 10 H
source impedance. See application notes for input capacitor requirements.
(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.
3
A
DFA6 SERIES BLOCK DIAGRAM
3
+ OUTPUT
ISOLATION TRANSFORMER
+
4
- OUT
ISO AMP
LOW TC
BANDGAP
REFERENCE
+
2
INPUT
1
+ INPUT
CURRENT
MODE
PWM
1.00
100% LOAD
50% LOAD
0.75
0.50
0.25
0.00
0
30
20
25
10
5
15
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
LINE INPUT (VOLTS)
INPUT CURRENT (AMPS)
Typical Performance: (Tc=25C, Vin=Nom VDC, Rated Load)
Data for 12 Volt Input Models
85
LINE = 9VDC
LINE = 12VDC
LINE = 27VDC
80
75
70
65
60
55
50
45
0
40
30
20
10
50
60
70
80
90 100
12 VOLT EFFICIENCY Vs. LOAD
LOAD (%)
EFFICIENCY (%)
90
LINE = 20VDC
LINE = 48VDC
LINE = 60VDC
85
80
75
70
65
60
55
50
40
45
0
40
30
20
10
50
60
70
80
90 100
48 VOLT EFFICIENCY Vs. LOAD
LOAD (%)
EFFICIENCY (%)
0.5
100% LOAD
50% LOAD
0.4
0.3
0.2
0.1
0.0
0
60
40
50
20
10
30
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
LINE INPUT (VOLTS)
INPUT CURRENT (AMPS)
Data for 48 Volt Input Models
DFA6 SERIES SINGLE OUTPUT
50
2
3
4
5
6
60
70
80
90
100
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
POWER OUTPUT
85
100% LOAD
50% LOAD
75
80
70
30
20
25
10
5
15
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
LINE INPUT (VOLTS)
EFFICIENCY (%)
90
100% LOAD
50% LOAD
75
80
85
65
70
60
50
30
20
40
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
LINE INPUT (VOLTS)
EFFICIENCY (%)
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