description the dfc25 series dc/dc converter provides tightly regulated output voltages for industrial and datacom applications from 12, 24, or 48 volt inputs. available output power ranges from 24.75 to 30 watts. excellent noise performance is attained via an aluminum case, toroidal magnetics, and double shielded transformers. common mode and differential mode input filtering is integral to the design. selected models provide 1544 volts isolation from the input to output. the input and output sections of the dfc25 series are protected from overvoltage transients via internal circuitry. same voltage models of the dfc25 family may be connected in parallel to achieve additional output current. dfc25 series single output features up to 30 watts output power remote on/off common and differential mode input filters +3.3, +5v, or +12v outputs remote voltage sense efficiencies to 81% operation from -25? to 85? 700/1544v isolation two year warranty ul/csa/t?v selection chart input range output output model vdc vdc ma max min max nominal dfc25e12s3.3 9 18 3.3 7500 dfc25e24s5 18 36 5 6000 dfc25e48s5 36 72 5 6000 DFC25E48S12 36 72 12 2500 side view 0.040 (1.02) dia 6 places 0.00 0.43 0.38 2.50 3.00 (63.5) (76.2) bottom view 2 9 8 1 7 6 4 5 2.05 1.65 1.25 0.85 0.45 2.75 0.25 (11.4) (21.6) (31.8) (42.0) (52.1) (6.3) (70.0) 0.00 0.000 (11.0) (9.65) notes (1) all parameters measured at 25?, nominal input voltage, and full rated load unless otherwise noted. (2) derate linearly to 0 watts at 105? ambient. operation to +70? ambient with externally supplied forced air cooling, 100lfm. (3) case is tied to -input, pin 1. pin connections pin number pin out 1 -input 2 +input 3n/c 4 on/off 5 trim 6 +output 7 -output 8n/c 9n/c note: all pins are 0.040" diameter brass with tin plating. mechanical tolerances unless otherwise noted: x.xx dimensions: ?.020 inches x.xxx dimensions: ?.005 inches general specifications (1) all models units isolation (3) isolation voltage input to output 12v, 24v input min 700 volts 48v input min 1544 10 a leakage input to output capacitance typ 700 pf remote on/off on logic level or pin open min 2.5 volts off logic level or tie to -input max 0.7 volts converter idle current typ 10 ma output trim function input resistance typ 40 k ? programming range min 10 % environmental case operating range (2) min -25 ? max +60 case functional range min -40 ? max +105 storage range min -45 ? max +105 thermal impedance typ 10 ?/watt general mtbf (calculated) typ 1,000,000 hours unit weight typ 2.6/71 oz/gm 1 rev. 04/2000
notes (1) all parameters measured at tc=25?, nominal input voltage and full rated load unless otherwise noted. (2) 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?/100v ceramic capacitor in parallel with a 1?/35v tantalum capacitor, 1 inch from the output pins to simulate standard pcb decoupling capacitance. (3) short term stability is specified after a 30 minute warm-up at full load, constant line and recording he drift over a 24 hour period. (4) per etsi-300-132 (5) recovery to within 1% in less than 1 millisecond after transient has been applied. dfc25 series application notes: external capacitance requirements a low esr external capacitance is required for operation of the dfc25 series. for maximum performance, it is recommended that the dfc25 series use a capacitor of sufficient ripple current capacity connected across the input pins, especially if a capacitive input source is farther than 1" from the converter. to meet the reflected ripple requirements of the converter, an input impedance of less than 0.09 ohms at 200 khz is required. external output capacitance is not required for operation, however it is recommended that 1f to 10f of tantalum and 0.001 to 0.1f ceramic capacitance be selected for each output to reduce system noise. additional output capacitance may be added for increased filtering, but should not exceed 400f. 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 ttl compatible circuitry. when the on/off pin is pulled low with respect to the -input, the converter is placed in a low power drain state. the input capacitors are kept fully charged in the off mode. for proper operation, this input may be driven from a logic gate directly. the on/off pin should never be pulled more than 0.3 volts below -input or have a voltage greater than +6 volts applied. dfc25 series ?single output input parameters (1) model dfc25e12s3.3 dfc25e24s5 dfc25e48s5 DFC25E48S12 units reflected ripple (2) typ 330 230 150 150 ma pp input current full load typ 2870 1563 781 762 ma no load typ 100 10 10 10 inrush current (4) max 50 50 50 50 a pk efficiency typ 72 80 80 82 % switching frequency typ 150 150 150 150 khz maximum input overvoltage, max 24 45 85 85 vdc 100ms maximum turn-on time, 1% output error typ 10 10 10 10 ms output parameters (1) model dfc25e12s3.3 dfc25e24s5 dfc25e48s5 DFC25E48S12 units output voltage 3.3 5 5 12 vdc min 3.26 5.05 5.05 11.90 output voltage accuracy typ 3.30 5.10 5.10 12.00 vdc max 3.33 5.15 5.15 12.10 rated load range min 0.75 0.60 0.60 0.25 a max 7.50 6.00 6.00 2.50 load regulation 10% load - max load typ 1 1 1 1 % line regulation vin = min-max vdc typ 0.2 0.2 0.2 0.2 % transient response 25% load step (5) typ 2 2 2 2 % short term stability (3) typ <0.05 <0.05 <0.05 <0.05 %/24hrs long term stability typ <0.1 <0.1 <0.1 <0.1 %/khrs input ripple rejection typ >40 >40 >40 >40 db noise, peak - peak (2) typ 75 75 75 75 mv pp temperature coefficient typ 100 100 100 100 ppm/? short circuit protection continuous, current limit protection from +out to -out 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 dependin g on the date manufactured. specifications are subject to change without notice.
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