Datasheet DFC25E24T5-12, DFC25E48T5-12, DFC25E48T3.3-12, DFC25E24T5-15 Datasheet (Power-one)

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PIN CONNECTIONS

PIN NUMBER PIN OUT

1 -INPUT 2 +INPUT 3 N/C 4 ON/OFF 5 TRIM 6 +3.3V OR +5V 7 COMMON 8 +12V OR +15V 9 -12V OR -15V

DESCRIPTION

The DFC25 Series DC/DC converter provides three output voltages from a single 12, 24, or 48 volt nominal input for industrial and datacom equipment. Available output power ranges up to 25 watts. Excellent noise performance is attained via an aluminum case, toroidal magnetics, and double shielded transformers. Common mode and differential mode input filtering are integral to the design. Selected models provide 1544 volts isolation from input to output.

The input and output sections of the DFC25 Series are protected from overvoltage transients via internal circuitry. Same voltage single output units of the DFC25 family may be connected in parallel to achieve additional output current.

DFC25 SERIES

TRIPLE OUTPUT

FEATURES

• Up to 25 Watts with Triple Outputs

• +3.3V or +5V Main Outputs

• Remote ON/OFF

• Common and Differential Mode Input Filters

• Main Output Trim

• Efficiencies to 81%

• Operation from -25°C up to 85°C

• 700/1544V Isolation

• Two Year Warranty

• UL/CSA/TÜV

Selection Chart - Up to 25 Watts Output Power

Input Range Output Output

Model VDC VDC mA MAX

Min Max Nominal

DFC25E24T5/12 18 36 +5.0, ±12 +5000, ±1000 DFC25E24T5/15 18 36 +5.0, ±15 +5000, ±800 DFC25E48T3.3/12 36 72 +3.3, ±12 +5000, ±1000 DFC25E48T5/12 36 72 +5.0, ±12 +5000, ±1000

SIDE VIEW

0.040 (1.02) DIA 6 PLACES

0.00

0.43

0.38

2.50

3.00

(63.5)

(76.2)

BOTTOM VIEW

9 8

7 6

2.05

1.65

1.25

0.85

0.45

2.75

0.25

(11.4)

(21.6)

(31.8)

(42.0)

(52.1)

(6.3)

(70.0)

0.00

0.000

(11.0)

(9.65)

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.

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

General Specifications (1)

All Models Units

Isolation (3)

Isolation Voltage

Input to Output

12V, 24V Input MIN 700

Volts

48V Input MIN 1544

10µA Leakage

Input to Output Capacitance TYP 700 pF

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

Output Trim Function

Input Resistance TYP 40 kΩ Programming Range MIN ±10 %

Environmental

Case Operating Range (2)

MIN -25

°C

MAX +60

Case Functional Range

MIN -40

°C

MAX +105

Storage Range

MIN -45

°C

MAX +105

Thermal Impedance TYP 10 °C/Watt

General

MTBF (Calculated) TYP 1,000,000 Hours Unit Weight TYP 2.6/71 oz/gm

Rev. 04/2000

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DFC25 SERIES – TRIPLE OUTPUT

Input Parameters (1)

Model DFC25E24T5/12 DFC25E24T5/15 DFC25E48T3.3/12 DFC25E48T5/12 Units

Reflected Ripple (2) TYP 230 230 150 150 mAPP Input Current

Full Load TYP 1563 1563 890 781

No Load TYP 10 10 10 10

Inrush Current (5) MAX 50 50 50 50 A

Efficiency TYP 80 80 78 80 % Switching Frequency TYP 150 150 150 150 kHz Maximum Input

Overvoltage, MAX 45 45 85 85 VDC

100ms Maximum

Turn-on Time,

1% Output Error

TYP 10 10 10 10 mS

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

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

from +OUT to -OUT

NOTES

(1) All 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

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 uses 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.

Continuous Current Limit Protection on 3.3V or 5V outputs, Momentary Current Limit Protection on 12V or 15V outputs