1 description the DFA6 series provides quick power conversion solutions to analog and digital systems. requires few external components. the converters provide plug-and-play versatility. the series features an input range of 3:1. the output is electrically isolated, thereby allowing the output to be configured for positive or negative output voltage. the DFA6 provides compact system power in less than 2.3 square inches (14.8 cm 2 ). the DFA6 series?ultra-wide input and no load input current (7ma) makes it well suited for battery operation in commercial and industrial applications. full overload protection is provided by pulse-by-pulse current limiting. features up to 6 watts output power overcurrent protection efficiency to 83% low input to output capacitance 700v isolation, input to output ultra-wide input range (3:1) 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 thermal impedance is specified as the case temperature rise over ambient per package dissipated mechanical tolerances unless otherwise noted: x.xx dimensions: ?.040 inches x.xxx dimensions: ?.010 inches 1 bottom view side view 0.040 (1.02) dia 2 3 4 4 places 0.800 0.000 0.66 0.48 0.3 0.000 0.300 0.500 0.000 0.200 2.12 1.08 (7.62) (5.08) (12.70) (16.8) (20.32) (7.62) (12.19) (53.85) (27.43) 0.64 (16.3) DFA6 series single output www.power-one.com www.power-one.com for the most up-to-date information 24 hours/day? days/week 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 DFA6 series ?single output DFA6 series application notes: external capacitance requirements no external capacitance is required for operation of the dfc6 series. to meet the reflected ripple requirements of the converter, an input impedance of less than 0.35 ohms from dc to 250khz is required. if a capacitive input source is farther than 1?from the converter, an additional capacitor may be required at the input pins for proper operation. 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. notes (1) all parameters measured at tc=25 c, 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 1f / 35v tantalum capacitor, 1 inch from the output pins to simulate standard pcb decoupling capacitance. reflected ripple is measured with the appropriate input capacitor, and into a 10 h source impedance. see application notes for input capacitor requirements. (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 a DFA6 series block diagram 3 + output isolation transformer + 4 - out iso amp low tc bandgap reference + 2 ?input 1 + input current mode pwm 1.00 100% load 50% load 0.75 0.50 0.25 0.00 0 30 20 25 10 515 12 volt input current vs. line input voltage line input (volts) input current (amps) typical performance: (tc=25?, vin=nom vdc, rated load) data for 12 volt input models 85 line = 9vdc line = 12vdc line = 27vdc 80 75 70 65 60 55 50 45 040 30 20 10 50 60 70 80 90 100 12 volt efficiency vs. load load (%) efficiency (%) 90 line = 20vdc line = 48vdc line = 60vdc 85 80 75 70 65 60 55 50 40 45 040 30 20 10 50 60 70 80 90 100 48 volt efficiency vs. load load (%) efficiency (%) 0.5 100% load 50% load 0.4 0.3 0.2 0.1 0.0 0 60 40 50 20 10 30 48 volt input current vs. line input voltage line input (volts) input current (amps) data for 48 volt input models DFA6 series ?single output 50 2 3 4 5 6 60 70 80 90 100 output power derating ambient temperature power output 85 100% load 50% load 75 80 70 30 20 25 10 515 12 volt efficiency vs. line input voltage line input (volts) efficiency (%) 90 100% load 50% load 75 80 85 65 70 60 50 30 20 40 48 volt efficiency vs. line input voltage line input (volts) efficiency (%)
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