DFA20 SERIES DUAL OUTPUT DESCRIPTION The compact, dual output 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. Converters with 48 volt inputs are isolated to 1544 volts. BOTTOM VIEW 2.02 (51.31) FEATURES • Remote ON/OFF and TRIM • Water Washable Case • Overcurrent Protection and Thermal Shutdown • Efficiencies to 85% • Low Input to Output Capacitance • 700Volt to 1544Volt Isolation • Five-Side Shielded Case • Extended Range Input (2:1) SIDE VIEW 0.040 (1.02) DIA 7 PLACES 4 1.100 (27.94) 0.700 (17.78) 0.600 (15.24) 0.400 (10.16) 0.300 (7.62) 0.000 0.100 (2.54) 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 (cont) (2) Case is electrically connected to Pin 2, -Input. (3) The functional case operating range is intended to give an additional data point for evaluating this converter. Sustained operation at the higher operating range 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. 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. Rev. 04/2000 1 DFA20 SERIES – DUAL OUTPUT Specification notes for this page are located on the next page. 2 DFA20 SERIES – DUAL OUTPUT NOTES (1) (2) (3) (4) (5) (6) 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. 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 peak-peak measurements, 10 kHz to 1 MHz for RMS measurements. Output noise is measured with a 1µF tantalum located 1" away from the converter to simulate PCB standard decoupling. Input reflected ripple is measured into a 1 µH source impedance. Load regulation for the outputs is specified as the voltage change when both outputs are changed from maximum to minimum at the same time. 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. 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. 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. Figure 1 shows the proper connections to use this function. If the TRIM function is not required the pin may be left floating. 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. +OUT 4 +OUT 4 TRIM DOWN TRIM 7 10K TRIM 7 LOAD -OUT 6 LOAD TRIM UP -OUT 6 USING TRIMPOT USING FIXED RESISTORS Figure 1. DFA20 SERIES BLOCK DIAGRAM OUTPUT POWER DERATING 20 SHIELDED ISOLATION TRANSFORMER + + + INPUT 1 – INPUT 2 LOW NOISE FILTER CURRENT MODE PWM + ON/OFF – 3 4 + OUTPUT 5 CMN 6 – OUTPUT 7 TRIM 15 POWER OUTPUT THERMAL LIMIT 10 5 SHIELDED COPPER CASE 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 – DUAL OUTPUT Typical Performance: (Tc=25°C, Vin=Nom VDC, Rated Load) 12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 12 VOLT EFFICIENCY Vs. LOAD 85 3.5 LINE = 12VDC LINE = 18VDC 75 80 100% FULL LOAD 75 70 70 0 10 20 30 40 50 60 70 80 9 90 100 10 11 12 13 14 15 16 17 24 VOLT EFFICIENCY Vs. LOAD 80 LINE = 24VDC 75 LINE = 36VDC 10 20 30 40 50 60 70 80 100% FULL LOAD 85 50% FULL LOAD 80 75 18 90 100 22 24 26 28 30 32 34 LINE = 72VDC 20 30 40 50 60 LOAD (%) 70 80 90 100 12 14 16 18 100% LOAD 50% LOAD 0.5 4 8 12 16 20 24 28 32 36 LINE INPUT (VOLTS) 48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 1.00 85 80 50% FULL LOAD 75 70 36 10 1.0 0 INPUT CURRENT (AMPS) EFFICIENCY (%) EFFICIENCY (%) LINE = 48VDC 8 6 1.5 36 100% FULL LOAD LINE = 36VDC 10 4 0.0 20 90 0 2 24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 48 VOLT EFFICIENCY Vs. LOAD 60 0.5 LINE INPUT (VOLTS) 90 75 50% LOAD 1.0 2.0 LOAD (%) 80 1.5 LINE INPUT (VOLTS) INPUT CURRENT (AMPS) EFFICIENCY (%) LINE = 18VDC 0 100% LOAD 2.0 0 90 70 2.5 0.0 18 24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE 90 85 3.0 LINE INPUT (VOLTS) LOAD (%) EFFICIENCY (%) INPUT CURRENT (AMPS) EFFICIENCY (%) EFFICIENCY (%) 50% FULL LOAD 80 12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE 85 LINE = 9VDC 40 44 48 52 56 60 64 LINE INPUT (VOLTS) 68 72 0.75 100% LOAD 0.50 50% LOAD 0.25 0.00 0 10 20 30 40 50 60 70 80 LINE INPUT (VOLTS) NOTES ON USING THE CURVES 1) The input currents are for 20 watts of output power. For ±5 volt output models the current is approximately 15% less. 2) 4 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%.