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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 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 cm2). 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)
BOTTOM VIEW 2.12 (53.85) 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 3 1.08 (27.43)
SIDE VIEW 0.040 (1.02) DIA 4 PLACES
0.800 (20.32)
Mechanical tolerances unless otherwise noted: X.XX dimensions: 0.040 inches X.XXX dimensions: 0.010 inches
For the Most Up-To-Date Information
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. The case Thermal Impedance is specified as the case temperature rise over ambient per package dissipated
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(2)
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.
Rev. 04/2000
1
0.48 (12.19)
0.3 (7.62)
0.000
DFA6 SERIES - SINGLE 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. Noise is measured per Technical Reference Section. Measurement bandwidth is 0-20 MHz for peakpeak 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. 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.
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.
(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=25C, 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
A
INPUT CURRENT (AMPS)
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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