1 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) dfa20 series single output 1 bottom view side view 0.000 0.000 0.25 0.000 2.02 (51.31) (6.35) 0.040 (1.02) dia 6 places 0.45 2.02 (11.43) (51.31) 2 3 7 6 5 1.800 0.11 0.700 0.300 0.100 0.600 0.400 0.51 (7.62) (2.54) (13.0) (17.78) (15.24) (10.16) (45.72) (2.8) 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 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. mechanical tolerances unless otherwise noted: x.xx dimensions: ?.020 inches x.xxx dimensions: ?.005 inches description the compact dfa20 series provides power densities up to 11 watts per cubic inch (0.67 watts per cm 3 ). 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. rev. 04/2000
2 dfa20 series ?single 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 for peak- peak measurements, 10 khz to 1 mhz for rms measurements. output noise is measured with a 0.01? ceramic in parallel with a 1?/35v tantalum capacitor located 1" away from the converter to simulate your pcb s standard decoupling. input reflected ripple is measured into a 10? source impedance. (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 5 +out 7 trim 10k load using trimpot 6 -out 5 +out 7 trim trim down trim up load using fixed resistors 6 -out 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. figure 1. dfa20 series block diagram 5 + output isolation transformer + 6 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 - out 50 0 5 10 15 20 60 70 80 90 100 output power derating ambient temperature power output 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.
4 dfa20 series ?single output 120 100 60 current limit mode > 80 40 20 0 080 20 40 100 120 140 60 output voltage vs. output load output load (%) normalized output (%) typical performance: (tc=25?, vin=nom vdc, rated load) 80 85 75 70 65 60 90 040 30 20 line = 72vdc line = 48vdc line = 36vdc 10 50 60 70 80 90 100 48 volt efficiency vs. load load (%) efficiency (%) notes on using the curves 1) the input currents are for 20 watts of output power. for ? volt output models the current is approximately 15% less. 2) the efficiency curves are for 12 volt output models. to use for other models adjust as follows: ? volt models subtract approximately 3%. ?5volt models add approximately 1%. 80 75 70 65 85 040 30 20 line = 18vdc line = 12vdc line = 9vdc 10 50 60 70 80 90 100 12 volt efficiency vs. load load (%) efficiency (%) 85 80 75 70 65 915 16 17 14 13 12 100% full load 50% full load 10 11 18 12 volt efficiency vs. line input voltage line input (volts) efficiency (%) 80 85 75 70 65 90 040 30 20 line = 36vdc line = 24vdc line = 18vdc 10 50 60 70 80 90 100 24 volt efficiency vs. load load (%) efficiency (%) 85 80 75 70 90 18 30 32 34 28 26 24 100% full load 50% full load 20 22 36 24 volt efficiency vs. line input voltage line input (volts) efficiency (%) 85 75 80 70 65 60 90 36 60 64 68 56 52 48 100% full load 50% full load 40 44 72 48 volt efficiency vs. line input voltage line input (volts) efficiency (%) 1.0 0.8 0.6 0.2 0.4 0.0 040 30 20 100% load 50% load 10 50 60 80 70 48 volt input current vs. line input voltage line input (volts) input current (amps) 2.0 1.5 1.0 0.5 0.0 020 15 10 100% load 50% load 52530 40 35 24 volt input current vs. line input voltage line input (volts) input current (amps) 4 3 2 1 0 08 6 4 100% load 50% load 2 10 12 16 14 18 12 volt input current vs. line input voltage line input (volts) input current (amps) www.power-one.com www.power-one.com for the most up-to-date information 24 hours/day? days/week
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