1 1 bottom view side view 0.000 0.000 0.3 0.000 2.02 (51.31) (7.62) 0.040 (1.02) dia 7 places 0.55 1.62 (13.97) (41.15) 2 3 7 6 5 4 1.800 0.11 1.100 0.700 0.400 0.100 0.600 0.300 0.31 (10.16) (2.54) (7.62) (7.9) (27.94) (17.78) (15.24) (2.8) (45.72) 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) dfc15 series dual output mechanical tolerances unless otherwise noted: x.xx dimensions: ?.010 inches x.xxx dimensions: ?.005 inches notes (1) all parameters measured at tc = 25?, 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. 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 dependin g on the date manufactured. specifications are subject to change without notice.
2 dfc15 series ?dual output notes (1) all parameters measured at tc=25?, 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. (3) an input capacitor must be used for proper operation of the converter. see the dfc15 series application notes on sizing the input capacitor. (4) load regulation for the outputs is specified as the voltage change when both outputs are changed from maximum to minimum at the same time. (5) 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. (6) short term stability is specified after a 60 minute warmup at full load, constant line and recording the drift over a 24 hour period. (7) 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)
3 dfc15 series ?dual output dfc15 series block diagram 4 + output isolation transformer + 6 ?output 5 cmn 7 trim isolated feedback low tc bandgap reference five sided shielded copper case + + 2 ?input on/off 1 3 + input current mode pwm thermal shutdown lc input filter 50 0 5 10 15 60 70 80 90 40 output power derating ambient temperature power output typical performance: (tc=25?, vin=nom vdc, rated load) 90 85 80 75 20 52 56 60 64 68 48 36 40 44 100% full load 50% full load 24 28 32 72 efficiency vs. line input voltage (12v output) line input (volts) efficiency (%) 1.0 0.8 0.2 0.4 0.6 0.0 20 52 56 60 64 68 48 36 40 44 100% full load 50% full load 75% full load 24 28 32 72 input ripple vs. line input (12v output) line input (volts) reflected rms ripple (amps) 120 100 80 20 40 60 0 0 200 150 100 50 250 300 350 400 output voltage vs. output load (12v output) output load (%) output voltage (%) 1.2 0.9 0.6 0.3 0.0 032 24 16 100% full load 50% full load 8 40 48 64 56 72 input current vs. line input (12v output) line input (volts) input current (amps) 90 80 70 60 040 30 20 line = 72vdc line = 48vdc line = 20vdc 10 50 60 70 80 90 100 efficiency vs. load (12v output) load (%) efficiency (%) application notes (cont?): 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. figure 1. 4 +out 7 trim 10k load using trimpot 6 -out 4 +out 7 trim trim down trim up load using fixed resistors 6 -out
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