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DFA20 SERIES
SINGLE OUTPUT
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 * 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-Side Shielded Case * Extended Range Input (2:1)
BOTTOM VIEW 2.02 (51.31)
SIDE VIEW 0.040 (1.02) DIA 6 PLACES
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
0.25 (6.35)
0.11 (2.8) 0.000
1.800 (45.72)
Mechanical tolerances unless otherwise noted: X.XX dimensions: 0.020 inches X.XXX dimensions: 0.005 inches
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 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.
0.45 (11.43)
0.000
Rev. 04/2000
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DFA20 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 0.01F ceramic in parallel with a 1F/35V Tantalum capacitor located 1" away from the converter to simulate your PCB's standard decoupling. Input reflected ripple is measured into a 10H source impedance. (3) (4) 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.
(2)
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DFA20 SERIES - SINGLE OUTPUT
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 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 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. 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 5.2 volt outputs for ECL applications. Figure 1 shows the proper connections to use this function. A trimpot value of 10K should be used for 3.3 and 5 volt outputs. A trimpot value of 20K 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
- INPUT
2
LC INPUT FILTER
CURRENT MODE PWM
6
- OUT
10
+
ON/OFF
7
TRIM
3
ISOLATED FEEDBACK
-
5
FIVE SIDED SHIELDED COPPER CASE
LOW TC BANDGAP REFERENCE
0 50
60 70 80 90 AMBIENT TEMPERATURE
100
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.
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DFA20 SERIES - SINGLE OUTPUT
Typical Performance: (Tc=25C, 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 20 25 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
40
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 (%)
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