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DFC15 SERIES
DUAL OUTPUT
DESCRIPTION The dual output DFC15 Series of DC/DC converters are designed to provide a wide range of PCB power solutions where positive and negative outputs are required. The converter features fully isolated and filtered input and outputs for low noise. Trim and remote ON/OFF features give flexibility to designs. The ultra-wide input range, from 20 to 72 volts, allows use in most industrial and communication applications. FEATURES * Remote ON/OFF and TRIM * Overcurrent and Overtemperature Protected * Water Washable Case * Efficiencies to 82% * 1544V Isolation * Ultra-Wide Range Input (>3:1)
BOTTOM VIEW 2.02 (51.31) 1.100 (27.94) 0.700 (17.78) 0.600 (15.24) 0.400 (10.16) 0.300 (7.62) 0.000 0.100 (2.54) 0.31 (7.9) 0.11 (2.8) 0.000 4
SIDE VIEW 0.040 (1.02) DIA 7 PLACES
5 1 2 6 1.62 (41.15)
3
7
0.3 (7.62)
1.800 (45.72)
Mechanical tolerances unless otherwise noted: X.XX dimensions: 0.010 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 logic ON/OFF pin is Open Collector TTL, CMOS, and relay compatible. The input to this pin is referenced to Pin 2, -Input and is protected to +100 VDC. (3) Case is tied to Pin 1, + Input. (4) The case thermal impedance is specified as the case temperature rise over ambient per package watt dissipated.
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
0.55 (13.97)
0.000
DFC15 SERIES - DUAL 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. An input capacitor must be used for proper operation of the converter. See the DFC15 Series Application Notes on sizing the input capacitor. Load regulation for the outputs is specified as the voltage change when both outputs are changed from maximum to minimum at the same time. Cross regulation is defined as the change in one output when the other output is changed from full load to 25% of full load. The converter can be run at no load on either or both outputs with no damage. Short term stability is specified after a 60 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.
DFC15 SERIES APPLICATION NOTES: External Capacitance Requirements An external capacitance is required for operation of the DFC15 Series. For maximum performance, it is recommended that the DFC15 Series use a capacitor of sufficient ripple current capacity connected across the input pins. To meet the reflected ripple requirements of the converter, an input impedance of less than 0.05 Ohms from DC to 200KHz is required. 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. (continued next page)
(2) (3) (4) (5) (6) (7)
2
DFC15 SERIES - DUAL OUTPUT
DFC15 SERIES BLOCK DIAGRAM
OUTPUT POWER DERATING
ISOLATION TRANSFORMER
15
THERMAL SHUTDOWN
+ +
+ INPUT
4 5 6
+ OUTPUT
POWER OUTPUT
CMN
10
1
- INPUT
2
LC INPUT FILTER
CURRENT MODE PWM
- OUTPUT
+
ON/OFF
7
TRIM
5
3
ISOLATED FEEDBACK
-
FIVE SIDED SHIELDED COPPER CASE
LOW TC BANDGAP REFERENCE
0 40
60 70 80 50 AMBIENT TEMPERATURE
90
APPLICATION NOTES (cont'd): 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. Do not drive this input from a logic gate directly; there is a 100K internal pull-up resistor to a 9 volt source. Output TRIM The TRIM pin may be used to adjust the output +5% to -34% from the nominal setting. This function allows adjustment for voltage drops in the system wiring. As well 5.2 volt Figure 1 shows the proper connections to use this function. A trimpot value of 10K or a fixed resistor may be used. If the TRIM function is not required the pin may be left floating.
Typical Performance: (Tc=25C, Vin=Nom VDC, Rated Load)
EFFICIENCY Vs. LINE INPUT VOLTAGE (12V OUTPUT) REFLECTED RMS RIPPLE (AMPS)
90 1.0 100% FULL LOAD 0.8 0.6 0.4 50% FULL LOAD 0.2 0.0 20 24 28 32 36 40 44 48 52 56 60 64 68 72
INPUT RIPPLE Vs. LINE INPUT (12V OUTPUT)
EFFICIENCY (%)
50% FULL LOAD 85
75% FULL LOAD
80 100% FULL LOAD
75 20 24 28 32 36 40 44 48 52 56 60 64 68 72
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
INPUT CURRENT Vs. LINE INPUT (12V OUTPUT)
1.2
OUTPUT VOLTAGE Vs. OUTPUT LOAD (12V OUTPUT)
120
INPUT CURRENT (AMPS)
0.9 100% FULL LOAD 0.6
OUTPUT VOLTAGE (%)
56 64 72
100 80 60 40 20 0
0.3 50% FULL LOAD 0.0 0 8 16 24 32 40 48
0
50
100
150
200
250
300
350
400
LINE INPUT (VOLTS)
OUTPUT LOAD (%)
+OUT 4 TRIM 7 -OUT 6 USING TRIMPOT 10K LOAD
+OUT 4 TRIM DOWN TRIM UP
EFFICIENCY (%)
EFFICIENCY Vs. LOAD (12V OUTPUT)
90 LINE = 20VDC
TRIM 7 -OUT 6
LOAD
80 LINE = 48VDC 70 LINE = 72VDC
USING FIXED RESISTORS
Figure 1.
60 0 10 20 30 40 50 60 70 80 90 100
LOAD (%)
3

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