Datasheet

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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C02 Page 11 of 24
FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48*
ABSOLUTE MAXIMUM RATINGS
Conditions
Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous
Full power operation 80 Vdc
Input Voltage, Transient
Operating or non-operating, tested:
100 mS max. duration
100 Vdc
Isolation Voltage
Input to output 2250 Vdc
Input Reverse Polarity
None, install external fuse None Vdc
On/Off Remote Control
Power on, referred to -Vin 0 15 Vdc
Output Power
0 60.6 W
Output Current
Current-limited, no damage,
short-circuit protected
0 5 A
Storage Temperature Range
Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range
36 48 75 Vdc
Recommended External Fuse
Fast blow 4 A
Start-up threshold, turn on
Rising input voltage 33 34.5 35.5 Vdc
Undervoltage shutdown, turn off
12
Falling input voltage 31 32.5 33.5 Vdc
Overvoltage protection
NA Vdc
Reverse Polarity Protection
None, install external fuse None Vdc
Internal Filter Type
Capacitance
Input current
Full Load Conditions
Vin = nominal 1.37 1.43 A
Low Line
Vin = minimum 1.83 1.89 A
Inrush Transient
0.05 A2-Sec.
Output in Short Circuit
100 200 mA
No Load input current
Iout = minimum, unit=ON 50 150 mA
Shut-Down Mode Input Current (TH)
15 25 mA
Shut-Down Mode Input Current (SMT)
15 20 mA
Reflected (back) ripple current
no filtering 150 200 mAp-p
Reflected (back) ripple current
Measured at input with specified filter 15 30 mAp-p
GENERAL and SAFETY
Efficiency
Vin=48V, full load 88 91 %
Vin=Min (TH) 89 90 %
Vin=Min (SMT) 89 91.5 %
Isolation
Isolation Voltage, input to output
2250 Vdc
Insulation Safety Rating
basic
Isolation Resistance
100
Isolation Capacitance (TH)
1000 pF
Isolation Capacitance (SMT)
1500 pF
Safety (meets the following requirements)
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Yes
Calculated MTBF
Per MIL-HDBK-217F, ground benign,
Tambient=+40°C
TBD Hours x 10
3
Calculated MTBF
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
3200 Hours x 10
3
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
470 520 570 KHz
Startup Time
Power on, Vout regulated 30 mS
Startup Time (TH)
Remote ON to Vout regulated 30 mS
Startup Time (SMT)
Remote ON to Vout regulated 20 mS
Dynamic Load Response
50-75-50% load step, settling time to within
1% of Vout.
25 50 µSec
Dynamic Load Peak Deviation
same as above ±180 ±240 mV
19
*NOTE: The ULS-12/5-D48NM-C (SMT version) contains ceramic capacitors. No tantalum capacitors are used.