Datasheet
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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C02 Page 7 of 24
FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
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 12 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
LC
Input current
Full Load Conditions
Vin = nominal 1.39 1.43 A
Low Line
Vin = minimum 1.85 1.91 A
Inrush Transient
0.05 A2-Sec.
Output in Short Circuit
100 200 mA
No Load input current
Iout = minimum, unit=ON 40 80 mA
Shut-Down Mode Input Current
5 10 mA
Reflected (back) ripple current ➁
no filtering 400 500 mAp-p
Reflected (back) ripple current ➁
Measured at input with specified filter 25 35 mAp-p
GENERAL and SAFETY
Efficiency
Vin=48V, full load 88 90 %
Vin=Min 88 90 %
Isolation
Isolation Voltage, input to output
2250 Vdc
Insulation Safety Rating
basic
Isolation Resistance
10 MΩ
Isolation Capacitance
1000 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 ➃
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+40°C
3200 Hours x 10
3
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
400 KHz
Startup Time
Power on, Vout regulated 10 20 mS
Startup Time
Remote ON to Vout regulated 10 20 mS
Dynamic Load Response
50-75-50% load step, settling time to within
1% of Vout.
50 100 µSec
Dynamic Load Peak Deviation
same as above ±200 ±250 mV
FEATURES and OPTIONS
Remote On/Off Control
“N” suffix:
Negative Logic, ON state
ON = Pin grounded or external voltage -0.1 0.8 V
Negative Logic, OFF state
OFF = Pin open or external voltage 2.5 15 V
Control Current
open collector/drain 1 2 mA
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