DFA20 SERIES SINGLE OUTPUT DESCRIPTION The compact DFA20 Series provides power densities up to 11 watts per cubic inch (0.67 watts per cm3). 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. BOTTOM VIEW 2.02 (51.31) 0.700 (17.78) 0.600 (15.24) 0.400 (10.16) 0.300 (7.62) 0.000 0.100 (2.54) 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) SIDE VIEW 0.040 (1.02) DIA 6 PLACES 5 1 2 6 3 2.02 (51.31) 7 0.45 (11.43) 0.000 0.25 (6.35) 1.800 (45.72) 0.11 (2.8) 0.000 0.51 (13.0) Mechanical tolerances unless otherwise noted: X.XX dimensions: ±0.020 inches X.XXX dimensions: ±0.005 inches 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) 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. Rev. 04/2000 1 DFA20 SERIES – SINGLE OUTPUT NOTES (1) (2) 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. Noise is measured per Technical Reference Section. Measurement bandwidth is 0-20 MHz for peakpeak measurements, 10 kHz to 1 MHz for RMS measurements. Output noise is measured with a 0.01µF ceramic in parallel with a 1µF/35V Tantalum capacitor located 1" away from the converter to simulate your PCB’s standard decoupling. Input reflected ripple is measured into a 10µH source impedance. (3) (4) 2 Short term stability is specified after a 30 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. 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 1F to 10F of tantalum and 0.001 to 0.1F ceramic capacitance be selected for reduced system noise. Additional output capacitance may be added for increased filtering, but should not exceed 400F. 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. Negative Outputs A negative output voltage may be obtained by connecting the +OUT to circuit ground and connecting -OUT as the negative output. +OUT 5 +OUT 5 TRIM DOWN TRIM 7 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. 10K TRIM 7 LOAD -OUT 6 USING TRIMPOT LOAD TRIM UP -OUT 6 USING FIXED RESISTORS Figure 1. DFA20 SERIES BLOCK DIAGRAM OUTPUT POWER DERATING 20 ISOLATION TRANSFORMER 5 + OUTPUT 6 - OUT 7 TRIM 15 + + INPUT – INPUT 1 2 LC INPUT FILTER CURRENT MODE PWM + ON/OFF 3 ISOLATED FEEDBACK FIVE SIDED SHIELDED COPPER CASE POWER OUTPUT THERMAL SHUTDOWN 10 5 – LOW TC BANDGAP REFERENCE 0 50 60 70 80 90 AMBIENT TEMPERATURE 100 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. 3 DFA20 SERIES – SINGLE OUTPUT Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load) 12 VOLT EFFICIENCY Vs. LOAD 4 85 80 LINE = 12VDC 75 LINE = 18VDC 70 80 100% FULL LOAD 75 70 10 20 40 30 50 60 70 80 10 11 14 15 16 17 0 18 LINE = 24VDC 70 85 50% FULL LOAD 80 75 20 40 30 50 60 70 80 70 18 90 100 22 85 85 EFFICIENCY (%) 90 LINE = 36VDC 80 75 LINE = 48VDC 65 10 20 30 40 50 60 26 28 30 32 34 70 80 90 100 100% LOAD 50% LOAD 0.5 0 5 10 20 25 30 35 100% FULL LOAD 50% FULL LOAD 70 0.8 100% LOAD 0.6 0.4 50% LOAD 0.2 0.0 40 44 48 52 56 60 64 68 72 0 10 20 30 40 50 60 70 LINE INPUT (VOLTS) 120 NOTES ON USING THE CURVES 100 1) The input currents are for 20 watts of output power. For ±5 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: ±5 volt models subtract approximately 3%. ±15volt models add approximately 1%. 80 CURRENT LIMIT MODE > 60 40 20 0 0 20 40 60 80 100 120 40 48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE LINE INPUT (VOLTS) OUTPUT VOLTAGE Vs. OUTPUT LOAD 15 1.0 75 LOAD (%) 18 LINE INPUT (VOLTS) 80 60 36 16 1.0 36 65 LINE = 72VDC 0 24 48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 48 VOLT EFFICIENCY Vs. LOAD 14 12 1.5 LINE INPUT (VOLTS) 90 10 0.0 20 INPUT CURRENT (AMPS) 10 8 6 2.0 LINE = 36VDC 0 4 24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE INPUT CURRENT (AMPS) 80 75 2 LINE INPUT (VOLTS) 100% FULL LOAD LINE = 18VDC EFFICIENCY (%) EFFICIENCY (%) 13 24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE LOAD (%) EFFICIENCY (%) 12 90 85 NORMALIZED OUTPUT (%) 50% LOAD 1 LINE INPUT (VOLTS) 24 VOLT EFFICIENCY Vs. LOAD 60 100% LOAD 2 0 9 90 100 90 70 3 65 0 LOAD (%) 65 INPUT CURRENT (AMPS) 50% FULL LOAD EFFICIENCY (%) EFFICIENCY (%) LINE = 9VDC 65 12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 85 140 For the Most Up-To-Date Information OUTPUT LOAD (%) www.power-one.com 24 Hours/Day—7 Days/Week 4 80