DFC25 SERIES SINGLE OUTPUT 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. 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°C to 85°C • 700/1544V Isolation • Two Year Warranty • UL/CSA/TÜV 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. BOTTOM VIEW Selection Chart Input Range VDC Min Max Model DFC25E12S3.3 DFC25E24S5 DFC25E48S5 DFC25E48S12 9 18 36 36 18 36 72 72 Output VDC Nominal Output mA MAX 3.3 5 5 12 7500 6000 6000 2500 SIDE VIEW 0.040 (1.02) DIA 6 PLACES 2.50 (63.5) 9 2.75 (70.0) 8 7 6 5 3.00 (76.2) General Specifications (1) Units 0.43 (11.0) pF 0.000 700 0.38 (9.65) TYP 4 2.05 (52.1) Volts 2 1.25 (31.8) 700 1544 1 0.85 (21.6) MIN MIN 0.45 (11.4) Input to Output Capacitance 0.25 (6.3) 0.00 0.00 Isolation Voltage Input to Output 12V, 24V Input 48V Input 10µA Leakage 1.65 (42.0) All Models Isolation (3) 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 PIN CONNECTIONS PIN NUMBER PIN OUT 1 -INPUT 2 +INPUT 3 N/C 4 ON/OFF 5 TRIM 6 +OUTPUT 7 -OUTPUT 8 N/C 9 N/C Output Trim Function Input Resistance TYP 40 kΩ Programming Range MIN ±10 % Case Operating Range (2) MIN MAX -25 +60 °C Case Functional Range MIN MAX -40 +105 °C Storage Range MIN MAX -45 +105 °C Thermal Impedance TYP 10 °C/Watt MTBF (Calculated) TYP 1,000,000 Hours Unit Weight TYP 2.6/71 oz/gm Environmental General Rev. 04/2000 NOTE: All pins are 0.040" diameter brass with tin plating. Mechanical tolerances unless otherwise noted: X.XX dimensions: ±0.020 inches X.XXX dimensions: ±0.005 inches NOTES (1) All parameters measured at 25°C, nominal input voltage, and full rated load unless otherwise noted. (2) Derate linearly to 0 Watts at 105°C ambient. Operation to +70°C ambient with externally supplied forced air cooling, 100LFM. (3) Case is tied to -Input, Pin 1. 1 DFC25 SERIES – SINGLE OUTPUT Input Parameters (1) Model DFC25E12S3.3 DFC25E24S5 DFC25E48S5 DFC25E48S12 Units Reflected Ripple (2) TYP 330 230 150 150 mAPP Input Current Full Load No Load TYP TYP 2870 100 1563 10 781 10 762 10 mA APK Inrush Current (4) MAX 50 50 50 50 Efficiency TYP 72 80 80 82 % Switching Frequency TYP 150 150 150 150 kHz Maximum Input Overvoltage, 100ms Maximum MAX 24 45 85 85 VDC Turn-on Time, 1% Output Error TYP 10 10 10 10 ms Output Parameters (1) Model DFC25E12S3.3 DFC25E24S5 DFC25E48S5 DFC25E48S12 Units 3.3 5 5 12 VDC Output Voltage Accuracy MIN TYP MAX 3.26 3.30 3.33 5.05 5.10 5.15 5.05 5.10 5.15 11.90 12.00 12.10 VDC Rated Load Range MIN MAX 0.75 7.50 0.60 6.00 0.60 6.00 0.25 2.50 A 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 Output Voltage Noise, Peak - Peak (2) TYP 75 75 75 75 mVPP Temperature Coefficient TYP 100 100 100 100 ppm/°C Short Circuit Protection from +OUT to -OUT NOTES (1) All parameters measured at Tc=25°C, 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 0.01µF/100V ceramic capacitor in parallel with a 1µF/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. Continuous, Current Limit Protection 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 1µF to 10µF of Tantalum and 0.001 to 0.1µF ceramic capacitance be selected for each output to reduce system noise. Additional output capacitance may be added for increased filtering, but should not exceed 400µF. 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. 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. 2