DFC25 Triple-Output DC-DC Series Data Sheet
JAN 26, 2006 revised to MAR 20, 2007 Page 2 of 3 www.power-one.com
Output Parameters (1)
Model DFC25EXXT3.3/XX DFC25EXXT5/XX DFC25EXXTX/12 DFC25EXXTX/15 Units
Output (8) V1 V1 V2,V3 V2,V3
Output Voltage 3.3 5 12 15 VDC
MIN 3.27 5.05 11.88 14.85
Output Voltage Accuracy TYP 3.30 5.10 12.00 15.00 VDC
MAX 3.33 5.15 12.12 15.15
Rated Load Range MIN 0.5 0.5 0.0 0.0 A
MAX 5.0 5.0 1.0 0.8
Load Regulation
25% Load - Max Load TYP 1.0 1.0 8.0 8.0 %
Line Regulation
Vin = Min-Max VDC TYP 0.2 0.2 3.0 3.0 %
Cross Regulation
25% Load - Max Load (6) TYP 3.0 3.0 8.0 8.0 %
Transient Response
25% Load Step (7) 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 (4) TYP >40 >40 >40 >40 dB
Noise, Peak - Peak (2) TYP 75 75 120 150 mVPP
Temperature Coefficient TYP 100 100 300 300 ppm/°C
Short Circuit Protection Continuous, Current Limit Protection
from +OUT to -OUT
Input Parameters (1)
Model DFC25E24T3.3/15 DFC25E24T5/12 DFC25E24T5/15 DFC25E48T3.3/12 DFC25E48T5/12 DFC25E48T5/15 Units
Reflected Ripple (2) TYP 230 230 230 150 150 150 mAPP
Input Current
Full Load TYP 1780 1563 1563 890 781 781 mA
No Load TYP 10 10 10 10 10 10
Inrush Current (5) MAX 50 50 50 50 50 50 APK
Efficiency TYP 78 80 80 78 80 80 %
Switching Frequency TYP 150 150 150 150 150 150 kHz
Maximum Input
Overvoltage, MAX 45 45 45 85 85 85 VDC
100ms Maximum
Turn-on Time,
1% Output Error TYP 10 10 10 10 10 10 mS
NOTES
(1) All All parameters measured at Tc=25°C, nominal input voltage and full rated load unless otherwise
noted. Refer to the Reference Section for the definition of terms, measurement circuits and other
information.
(2) Noise is measured per the 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 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
the drift over a 24 hour period.
(4) The transient response is specified as the time required to settle from a 50 to 75% step load change
(rise time of step = 2µSec) to a 1% error band.
(5) Per ETSI-300-132
(6) Change to main channel output for a 25% to 100% change on dual outputs or change on dual
channel outputs due to a 25% to 100% change on the main channel output.
(7) Recovery to within 1% in less than 1 millisecond after transient has been applied.
(8) V3 is defined as the minus, or negative output. Values in the chart are shown as positive for V2, and
can be assumed negative for V3.
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.